Disabling Low Tire Sensors and Warning Light

[Brillo1990]

I have a bad sensor in one wheel from a guy using fix a flat in the tire, I want to remove all of the sensors and disable the warning light if I can. I deal with this all the time at work (midwest weather) and don't need to have work follow me home too. Is there a way to do this so I can use my brain and check tire pressure on my own? :mrgreen: Thanks!

[xlr8nflorida]

I have a bad sensor in one wheel from a guy using fix a flat in the tire, I want to remove all of the sensors and disable the warning light if I can. I deal with this all the time at work (midwest weather) and don't need to have work follow me home too. Is there a way to do this so I can use my brain and check tire pressure on my own? :mrgreen: Thanks!

Why not just buy a sensor?

If its orange one there is NEW one on line now for like $80.

[Brillo1990]

Why not just buy a sensor?

If its orange one there is NEW one on line now for like $80. I'm not in love with the things to start with and like I said we constantly have them going off at work on our vehicles (mostly Ford Windstars/Freestars) and they drive me insane. LOL I'd just like to disable them if I can along with the warning light unless there is a reason not to do it. Thanks for the quick reply. BTW they are all original sensors.

[Brillo1990]

It is your car so you can do as you choose. They do provide valuable feedback and typically don't experience problems like new ones do. Our Tire sensors don't use batteries which is cool.

Faster to yank the one wheel off and put a new tire sensor on then break down all the wheels, and wrap up the sensors and put them in storage.

If you decide to sell them (I don't think you should) I'd be willing to buy them as spares.

I'm sorry I can't help you in how to disable the light. I don't have them on my car because the sensors are on my original tires/rims in storage so I know it can be done. I'm just not sure of the correct procedure.



Good Luck. Right now I have all the tires off and am getting the rims powder coated which is why I was asking. Is there any other info the sensors provide other than low tire pressure that I'm missing? I noticed they all were labeled for specific wheels RF RR LF LR, do they need to be in the correct wheel? Does a code come up for which wheel is the culprit? I guessing yes since they are labeled. Thanks for the reply.

[xlr8nflorida]

The C4 system uses a transmitting wheel sensor held in place by large band clamp. Each sensor has a separate identification color and frequency, which is transmitted as the wheel turns. If a sensor gets mounted to the wrong wheel, a Diagnostic Trouble Code (DTC) will be sent. Wheel position, sensor colors and Diagnostic Trouble Codes (DTC) are as follows:

* Right Rear: Orange, DTC=24
* Left Rear: Yellow, DTC=34
* Left Front: Green, DTC=44
* Right Front: Blue, DTC= 54

It is possible to attain the code from your dashboard. With the key in the “on” position, press and hold the “Trip/Odo” button until “1.1″ is visible on the trip odometer readout. Next, press the “Eng/Met” button to scroll down the present code list (which is displayed at the MPH indicator) until you see the applicable one.

The movement of the wheel provides the energy necessary to power the transmitter. If the tire pressure drops below 25 PSI, the sensor stops transmitting to the receiver, and the “Service LTPWS” lamp illuminates. The sensors don’t require batteries, and the receivers don’t need to be reprogrammed.

I believe that most just unplug the bulb in the dashboard. I believe others have removed them and got no light (lucky) and then others have disconnected the brain that the sensors "talk to"

Somebody will chime in. Like I said they were designed for 100,000 miles and don't use batteries. I don't see alot of people with issues on them. Although if you don't have them, there will absolutely be no issues :cheers:

[Brillo1990]

So I guess if they're sitting in the garage 10 miles away then they can't transmit a signal then can they. :mrgreen: Thanks for the info much appreciated. :cheers:

[ScottZ95ZR1]

I believe that for the '90 MY only, removal of all sensors will result in no LTPWS light.

For the '91-'95 models, the bulb must be removed from the DIC.

[xlr8nflorida]

Sometimes, I think the light is not triggered.

Here are 3 options.

Pull the cruise control switch Fuse but then you won't have cruise.

Remove the bulb

Ghetto Fix

Put some black electrical tape over the light, and then get one of those snazzy C4 decorative plates that go over the DIC.:dancing

[xlr8nflorida]

I believe that for the '90 MY only, removal of all sensors will result in no LTPWS light.

For the '91-'95 models, the bulb must be removed from the DIC.


I believe you are correct now that I think of it as I have no light.

[USAFPILOT]

I have a 94 and after I removed them the light stayed off until one day when I disc the battery and reconnected it. I guess it reset then and has been on ever since. I think about taking the bulb our every now and then, but the sensors are still mounted on my A-Molds, so if I ever feel like switching back the system will still work. I wish it was programmable.

[xlr8nflorida]

So I guess if they're sitting in the garage 10 miles away then they can't transmit a signal then can they. :mrgreen: Thanks for the info much appreciated. :cheers:

That **** is funny.

Have a good day :)

[Brillo1990]

Sometimes, I think the light is not triggered.

Here are 3 options.

Pull the cruise control switch Fuse but then you won't have cruise.

Remove the bulb

Ghetto Fix

Put some black electrical tape over the light, and then get one of those snazzy C4 decorative plates that go over the DIC.:dancing Hahahaha the Getto fix was done already before I bought the car. You have a good day too you should be out enjoying your weather down there.

[xlr8nflorida]

I have a 94 and after I removed them the light stayed off until one day when I disc the battery and reconnected it. I guess it reset then and has been on ever since. I think about taking the bulb our every now and then, but the sensors are still mounted on my A-Molds, so if I ever feel like switching back the system will still work. I wish it was programmable.

I wonder if pulling the fuse for the cruise control is kosher. It works. Wonder if there is a downside.

I have owned my ZR-1 10 years and have never used cruise [-X

Messing with the trim plates makes me nervous, I have a some spares but when you pull those panels off a bunch the tabs can easily break off etc.

[ScottZ95ZR1]

I have a 94 and after I removed them the light stayed off until one day when I disc the battery and reconnected it. I guess it reset then and has been on ever since. I think about taking the bulb our every now and then, but the sensors are still mounted on my A-Molds, so if I ever feel like switching back the system will still work. I wish it was programmable.

I had the same issue with my '95 and lived with the light. You have no other option less removing the bulb.
Good idea to continue to live with the light if there's even a remote chance you might sell your car,
as a prospective buyer would likely want to see that the LTPWS system functions properly. My buyer did.

[bldavis11]

I believe that for the '90 MY only, removal of all sensors will result in no LTPWS light.

For the '91-'95 models, the bulb must be removed from the DIC.
Negative. I've removed them from my '91. No lights, no codes. LTPWS light works as well. Hope this helps!

[ScottZ95ZR1]

Negative. I've removed them from my '91. No lights, no codes. LTPWS light works as well. Hope this helps!

Hmmmm. I purchased a '91 with no sensors installed last September and the LTPWS light was on constant.

I contacted Marc Haibeck and was told for '91-'95 the bulb must be removed. He removed the lamp for me when he did some work on the car in November.

I am certain he told me that only the '90 MY allowed removal of sensors resulting with no light, with the bulb still in DIC. But my memory sure isn't as sharp as it once was.

[bldavis11]

Hmmmm. I purchased a '91 with no sensors installed last September and the LTPWS light was on constant.

I contacted Marc Haibeck and was told for '91-'95 the bulb must be removed. He removed the lamp for me when he did some work on the car in November.

I am certain he told me that only the '90 MY allowed removal of sensors resulting with no light, with the bulb still in DIC. But my memory sure isn't as sharp as it once was.
Dunno man! I can say that (1) they have been removed from my car, and (2) that light works. Other than that, I don't know!

[VetteVet]

My sensors are removed in my 91 and no light on dash. Bulb is installed and operational.

[ScottZ95ZR1]

My sensors are removed in my 91 and no light on dash. Bulb is installed and operational.

I dug up the email I received in November and it states....

"On '90's, if there are no sensors the error light will not light. On '91's and up it will. If you clear the error it will return after three trips that are 30 minutes or more".

This was indeed the case with my '91.

But as confused as I am, the good news for the OP is that he should not see the LTPWS light with all sensors removed from his '90. :cheers:

[ScottZ95ZR1]

My sensors are removed in my 91 and no light on dash. Bulb is installed and operational.

Have you driven the car at least three occasions for over 30 minutes since removing the sensors?

[USAFPILOT]

I might try the fuse, and have already been contemplating the ghetto fix.

[tomtom72]

Not that me chiming in matters much, but Scott is correct that on the 90's you can remove all four sensors and not have to deal with the "service LTPWS" light. :thumbsup:

I think if the early receiver's programing gets no signal from any sensor it doesn't know what to do, so it does nothing. I think the system got smarter after 90.;)
:cheers:

[Brillo1990]

Not that me chiming in matters much, but Scott is correct that on the 90's you can remove all four sensors and not have to deal with the "service LTPWS" light. :thumbsup:

I think if the early receiver's programing gets no signal from any sensor it doesn't know what to do, so it does nothing. I think the system got smarter after 90.;)
:cheers: Well this is one time I'm glad I have a stupid system. :mrgreen: I've been contemplating on if I want to do the plenum pull to put new injectors in next but not sure I want to go through the hassle right now or not.

[tomtom72]

not to spend other people's money for them....but i waited with my 90 instead of doing the job over the winter and it cost me a month during the driving season. Of course at the time it was RC or GM or nothing, but now there are a lot of vendors. JMHO, snow season = perfect time to fix all the questionable stuff you know will eventually bite you during the prime driving months. :mrgreen:

[VetteVet]

Have you driven the car at least three occasions for over 30 minutes since removing the sensors?


Yes, I have. Don't know why mine isn't lighting, but it's not. Doesn't show a code, either.

[GOLDCYLON]

I was told only the MY 90s and MY 91s were the only two years that wont throw a code with ALL the bands removed. Scott's is the only 91 however that blew this theory. Im still running tire bands so I can only relate what I have been told. GC

[VetteVet]

Just checked my 91 FSM. It states:

The receiver unit is also "listening" for diagnostic signals. At least one from each tire must be received during the time period called a "Diagnostic Cycle." At the end of this diagnostic cycle, the receiver checks that all sensors have reported. If they have all reported in (vehicle moving - all sensors functioning), then no action is taken and another system diagnostic cycle begins. But if one, two or three wheel sensors have not reported (signaled), then the "SERVICE LTPWS" telltale lamp is illuminated and a wheel sensor fault code is then stored in the receiver/control module diagnostic memory.

The key here is that 4 wheel sensors not reporting will not set any sensor codes.

This would tend to agree with what GC posted above.

I would suspect that it should set a code 99, though, since the system would think that the receiver has malfunctioned.

I think someone would have to do some testing on a known good system to get a concrete resolution to this one, as the FSM is just too vague.

[ScottZ95ZR1]

All I know for sure is that with all sensors removed and no stored codes, my '91 still had the LTPWS light on constant.

Marc Haibeck advised that would be the case for all '91 cars on up. He later removed and bagged the bulbs for me when doing other work on the car.

That's what it took to get rid of the light in my car anyway.

Now I'm confused again - but at least I'm not staring at that damn light anymore ! :cheers:

[GOLDCYLON]

Marc should know but then why have several others in a 91 had no light when ALL the bands are removed?

Was not the band sensor change over in 93 to the White bodied sensors? I made the jump in reasoning that the Sensor change light have something to do with it. However that theory is crap because what about the 92s they had black bands as well

[VetteVet]

Just looked at the ZR-1 parts breakdowns.

90-92 used the same P/N sensors AND the same P/N LTPWS module.
Since these are only parts in the system (other than the bulbs, wiring, etc.), then I think that it is safe to assume that 90-92 would all function in the same manner.

Just my .02.

[Brillo1990]

not to spend other people's money for them....but i waited with my 90 instead of doing the job over the winter and it cost me a month during the driving season. Of course at the time it was RC or GM or nothing, but now there are a lot of vendors. JMHO, snow season = perfect time to fix all the questionable stuff you know will eventually bite you during the prime driving months. :mrgreen: I hear ya Tom, you never know, I'm known for being impulsive and I'm anal about my stuff so in all likelyhood it will probably take place. :D

[cward]

My 91 did not turn on the light with the sensors removed. It was working when I removed the sensors after one came unglued at about 150 mph. Fortunately on left rear because it really unbalanced the tire and got my immediate attention.

[GTOger]

I believe that for the '90 MY only, removal of all sensors will result in no LTPWS light.


Confirmed. I just changed tires and pulled the sensors off at tire-change time. Warning light GONE!

I find that me and my gauge are a superior team to the flaky sensors and the idiot light.

Now if I could just convince the car I'm wearing my seat-belt and the INFL REST system is fine... that's another thread to hijack, though. ;)

[Hammer]

I've had two '91's. Removed the sensors from both and the light didn't/doesn't come on.

[wprice]

Hi Guys,

Jsst to revist this subject again, I am putting on completely new set of wheels and tires on my 94 will the warning ligts come on?

Wayne

[GOLDCYLON]

Hi Guys,

Jsst to revist this subject again, I am putting on completely new set of wheels and tires on my 94 will the warning ligts come on?

Wayne


Without a doubt yes.

Your options are to replace the bands with functionind units

Pull the bulb from the back side of the Drivers Information Center or DIC

Put a small piece of electrical tape over the warning light

Take your pick.

[Daniel_Mc]

It's a totally different year than dicussed and not a ZR-1 but I have had Fikse wheels on the GS for a few years and no warning light, ever.

Daniel

[USAFPILOT]

Does anyone know if there are any unwanteed side effects from removing the cruise control fuse?

[Kevin]

Does anyone know if there are any unwanteed side effects from removing the cruise control fuse?

you won't have cruise control, and i can't stand driving long distances without it

[jrd1990zr1]

The C4 system uses a transmitting wheel sensor held in place by large band clamp. Each sensor has a separate identification color and frequency, which is transmitted as the wheel turns. If a sensor gets mounted to the wrong wheel, a Diagnostic Trouble Code (DTC) will be sent. Wheel position, sensor colors and Diagnostic Trouble Codes (DTC) are as follows:

* Right Rear: Orange, DTC=24
* Left Rear: Yellow, DTC=34
* Left Front: Green, DTC=44
* Right Front: Blue, DTC= 54

It is possible to attain the code from your dashboard. With the key in the ?on? position, press and hold the ?Trip/Odo? button until ?1.1″ is visible on the trip odometer readout. Next, press the ?Eng/Met? button to scroll down the present code list (which is displayed at the MPH indicator) until you see the applicable one.

The movement of the wheel provides the energy necessary to power the transmitter. If the tire pressure drops below 25 PSI, the sensor stops transmitting to the receiver, and the ?Service LTPWS? lamp illuminates. The sensors don?t require batteries, and the receivers don?t need to be reprogrammed.

I believe that most just unplug the bulb in the dashboard. I believe others have removed them and got no light (lucky) and then others have disconnected the brain that the sensors "talk to"

Somebody will chime in. Like I said they were designed for 100,000 miles and don't use batteries. I don't see alot of people with issues on them. Although if you don't have them, there will absolutely be no issues :cheers:

I have to ask, I was told by a very good source you could not diagnose which tire sensor was bad on a 1990. That feature was not programmed into the LTPWS reciever until 1991. Have you (or any one else) tried this on a 1990?

Thanks, :cheers:

[KGV]

It is possible to attain the code from your dashboard. With the key in the “on” position, press and hold the “Trip/Odo” button until “1.1″ is visible on the trip odometer readout. Next, press the “Eng/Met” button to scroll down the present code list (which is displayed at the MPH indicator) until you see the applicable one.



Hi,

I tried this procedure to find out which sensor is bad, but it does not seem to work for me. I put the key in the ON position and press and hold the Trip/Odo, but the display just cycles between the total mileage and the trip mileage. The 1.1 does not appear. Mine is a 1991.

Am I missing a step?

Thanks,

ken

[tomtom72]

Okay, I'll take a stab at answering....:o standard disclaimer in that I'm not too sharp with this electronic stuff! Boy, what an understatement.

I have a 90, so in my FSM it has a diagnostic procedure to use but it in no way involves anything electronic! There is no scanner to plug in and use to figure out which wheel sensor and or if the brain box is bad. I know the 90 and 91 parts are the same so I don't see what the difference could be between the 90 & 91 system?

The diagnostic flow chart is mostly mechanical work. The FSM says to use the spare at all the wheel positions, one at a time. Mount the spare and drive over 40km/h for 5 mins. Eventually the the Low tire pressure light will go out because that offending sensor is out of the system. Also, the FSM says to disregard the "service LTPWS" light, as one of the sensors is out of the system & didn't check in it turns on that warning light. What you're looking for is when the "Low Tire Pressure" light goes out.

:cheers:
Tom

[Hib Halverson]

Without a doubt yes.

Your options are to replace the bands with functionind units

Pull the bulb from the back side of the Drivers Information Center or DIC

Put a small piece of electrical tape over the warning light

Take your pick.

Another option is to disconnect the LTPWS module power by unplugging C215 or heck...remove the LTPWS module all together and send it to me to keep as a spare. ;)

[GOLDCYLON]

Another option is to disconnect the LTPWS module power by unplugging C215 or heck...remove the LTPWS module all together and send it to me to keep as a spare. ;)


That may be an option as well Hib but if you pull or unplug the module im not sure if that might not set yet another code. No idea on that one somebody may know here

[VetteMed]

I removed the module from my car, no codes set in CCM.

Of course, I also removed the bulbs from the DIC when I did so.

[GOLDCYLON]

I removed the module from my car, no codes set in CCM.

Of course, I also removed the bulbs from the DIC when I did so.

NATCH

[Fully Vetted]

I didn't want to start another thread on this subject since this one is relatively current but has anyone disabled or otherwise "rigged to ignore" their LTPWS and wished they hadn't?

I'm mounting my Shelby's soon and am curious about my options. It's been suggested by a very esteemed and respected member of our group that I just take out the bulb and be done with it but I'm thinking it's a pretty useful system. I mean, I love it on all my other cars. But the Shelby's are 18's. Will the bands fit on 18's? If not, where can I get larger bands?

Just kinda need some input before I decide.

[GTOger]

Just remove the bands and the light will go away on its own. That's what I did, and I don't miss it a bit. I'm very well capable of checking my tires on my own.

nb: we bought a new Swedish vehicle recently. The car has everything. It literally won't allow you to crash. If you ever want to feel like a complete moron, drive one of those cars. I mean, it's lovely and I really like it, but... no wonder everyone's txt'ing. There's nothing left to do!

Seriously, back to the topic at hand, just remove the bands. The light will take care of itself and you'll be happy.

[Fully Vetted]

Like I said, I'm putting on new wheels so I won't need to take the bands off. I just won't install them. Besides, it's not the checking of the tires before I head out that's the problem. It's once I'm rolling down the road. If I can get a heads up that I've got a tire going down a few minutes before I can feel it I could potentially save a wheel. I don't know. Am I over thinking it? Is this one of those systems that is more trouble than it's worth, kind of like the secondaries?

[WVZR-1]

I didn't want to start another thread on this subject since this one is relatively current but has anyone disabled or otherwise "rigged to ignore" their LTPWS and wished they hadn't?


I'm mounting my Shelby's soon and am curious about my options. It's been suggested by a very esteemed and respected member of our group that I just take out the bulb and be done with it but I'm thinking it's a pretty useful system. I mean, I love it on all my other cars. But the Shelby's are 18's. Will the bands fit on 18's? If not, where can I get larger bands?

Just kinda need some input before I decide.

When mounting the tires to the Shelby's make sure that a paraffin base mounting compound is used and of course a nitrogen fill is wise.


I don't know if the bands are a fit to 18's or not. I do believe that bands can be purchased. It seems the bands are available "everywhere"!! An acquaintance in Texas used to double band his in an attempt to avoid one coming loose on a "high speed" night run. I believe he did several a month.

I would actually consider an aftermarket package that reports pressure and temperature by location. There are a few out there but most of the positive comments seem to be a system done by "Orange Electronics". I believe they were or maybe still are a US based company but who knows today. There is I believe an early product and a later product that share the same part number. I studied it once for a friend in depth but he never did the "buy"! I have no hands on. It has a very compact display that you could store most anywhere. If I recall the differences early or late I'll post back. Theirs I believe had the least expensive sensors if you needed a service one. I'm sure there are other brands. Maybe check with a higher-ended Harley Shop for branding information.

I don't know about the "just remove bands" comment for a "94MY when addressing the DIC lamp. It might be nice if it still did the "bulb check" with key-on as a reminder to occasionally remind one to look!

I'd start with the product research at Amazon:

http://www.amazon.com/Orange-Electronic-P409S-Retrofit-Monitoring/dp/B002DYH586

[GTOger]

If you just remove the bands (or don't install them on the new wheels) then the light will go out on the DIC and won't come on. I would recommend that, since let's be honest, this was a very early system and the technology has been eclipsed by what is available today. A neatly installed aftermarket system would be the route I chose... if I was going to concern myself with it at all. Which personally, I would not. I think I'm a big enough boy to know the difference between a flat tire and a good tire.

I have heard rumors of sensors that connect with an app on your phone. IIRC, Continental had announced something like that. To me, that would be a better option than trying to cram another aftermarket thingie onto the dashboard. Perhaps that is something to look into. Or for some enterprising young entrepreneur... ;)

[WVZR-1]

If you just remove the bands (or don't install them on the new wheels) then the light will go out on the DIC and won't come on.

I believe that's only true for a '90MY. I'd need to check that but I'm quite confident that it's a '90MY only. I believe for a '94MY you need to either remove the fuse (cruise control no longer works) OR remove bulbs from DIC. I'd be inclined I think to buy bands or do an after-market system like I mentioned earlier.

I believe I've read about "blue-toothed" TPWS for bicycles! An Android app might be out there!

[ScottZ95ZR1]

Several '91 owners here have reported having a known good LTPWS with no light displayed when sensors removed. This was not the case with my '91... I had to remove the bulb.

But I'm sure it's true that a for a '94 car, the owner will either have to remove the fuse or bulb.... I've not seen anyone with a '92 or later car report otherwise.

[MikeGolf]

The '93 light will come on when the bands are removed. Went to an aftermarket system.

[WVZR-1]

The '93 light will come on when the bands are removed. Went to an aftermarket system.

Since the '93MY DID and the sensors are the same '93 to end of production I believe it safe to assume that '94 & '95MY's would react similarly!!

[WVZR-1]

It seems that Orange Electronics has a system presently with iPhone capabilities:

http://www.orange-electronic.com/en/orange_retrofit.html

I read briefly the description and it appears it uses a "blue-tooth" module that plugs in to cigar lighter. I don't know why a person couldn't hard-wire that someplace else that might be more appropriate. The link takes you to a multi-choice system page. They've got a couple systems. Orange at one time was a US corp - doesn't seem so presently. I would assume if Orange has it that others should also. The first I noticed the availability today looking for a system for my friend again.

[WVZR-1]

Tire Vitals TPMS P418 by Orange:

It appears maybe they're using eBay as a marketing tool maybe for price point.

The product seems presently only available there OR it's maybe the quickest delivery available presently:

http://www.ebay.com/itm/TPMS-P418-For-iPhone-iPad-Orange-Electronic-Pressure-Monitoring-System-White-/181067235736?pt=Motors_Car_Truck_Parts_Accessories&hash=item2a2872c198&vxp=mtr

[alwayscode390]

OK, well I just installed new wheels and took everyones advice in this thread ... that if I don't have ANY installed, the LOW TIRE light wouldn't come on.

Its on :(

I thought 1990's were fine without the bands? I sold the other tires already with the bands on them LOL ... I thought I wasn't running bands at all. Time for the black tape mod until I can get in there and take out the bulb I guess ---

[GOLDCYLON]

OK, well I just installed new wheels and took everyones advice in this thread ... that if I don't have ANY installed, the LOW TIRE light wouldn't come on.

Its on :(

I thought 1990's were fine without the bands? I sold the other tires already with the bands on them LOL ... I thought I wasn't running bands at all. Time for the black tape mod until I can get in there and take out the bulb I guess ---


You need to clear the stored code.

[alwayscode390]

With an obd1 scanner? That's great news!!! ---

[Hammer]

I removed the sensors from both my '91's and no lights.

[GOLDCYLON]

With an obd1 scanner? That's great news!!! ---

Yes if it has a clear codes function

[WVZR-1]

With an obd1 scanner? That's great news!!! ---

The LTPWS on a '90MY can NOT be cleared using any scanning device. Not until '91MY could the Tech1 be used to diagnose the system at all. A '90MY though when all sensors are removed the light should not be a situation. I might understand the lights for maybe a first key on cycle but NOT on subsequent ones.

FROM THE REGISTRY FAQS:

For the 1990 and 1991 ZR-1's nothing. You will not see any error indications on your dash. It'll be as if you never had the LTPWS option.

For 1992-1995 ZR-1's your LTPWS error light on your dash may light. Telling you your system has malfunction. Whenever you remove all 4 wheel sensors you will get a code 99. It may not appear right at first and can go up to 200 miles before it turns the light on and sets the code, but it will happen. There are two things that can be done and both require removing the DIC.

One is to remove the 2 lights in the upper right hand corner of the DIC and the other is to unplug the module. This can be done by using a hook to fish the connector out to where you can unplug it.. The module is attach to the right side of the speedo cluster and can be seen through the hole behind the DIC. It has a pink wire and a black wire going to it, after 91 there is a third wire, tan.

The easiest thing to do is to remove the DIC and remove the 2 light bulbs or you can also remove the cruise control fuse, which will also disable illumination of the LTPWS lights; of course, that option disables the cruise control function.

Thanks to Jim VanDorn and Jerry Watts for this information.

Viewed: 19 times • Created on: 4/26/2012 • Modified on 4/26/2012

---------------------------------------------------------------
*** '90MY LTPWS module is controlled by CCM fuse which DOES control cruise so:

Now for what ever reason you have lights the module is controlled by the CCM fuse, you might consider removing it for a short while and assume it might "reset" the module and let you move along. You could attempt it by doing the negative cable but that generally resets everything and can create issues. The harness for module might be able to be fished out by just removing the AC Vent, I've never looked for it but the pink/black is correct colors as mentioned above.

More reference material from the Registry:

http://www.zr1netregistry.com/Portals/0/Downloads/GM%20Body%20Systems%20Application%201988-2004.pdf

Check under Vehicle Coverage '90MY and compare to '91MY

[alwayscode390]

I will drive it a few times and see if it turns on again.

It turned on about 100 ft from my mechanics , and he didn't say he noticed it when he test drove it.

Thanks for the procedure though.

If the wheels I installed have sensors in them from lets say a 93' Car, would that interfere with my 90' system or would they just not communicate? ---

[ScottZ95ZR1]

FROM THE REGISTRY FAQS:

For the 1990 and 1991 ZR-1's nothing. You will not see any error indications on your dash. It'll be as if you never had the LTPWS option.

For 1992-1995 ZR-1's your LTPWS error light on your dash may light. Telling you your system has malfunction. Whenever you remove all 4 wheel sensors you will get a code 99. It may not appear right at first and can go up to 200 miles before it turns the light on and sets the code, but it will happen. There are two things that can be done and both require removing the DIC.

One is to remove the 2 lights in the upper right hand corner of the DIC and the other is to unplug the module. This can be done by using a hook to fish the connector out to where you can unplug it.. The module is attach to the right side of the speedo cluster and can be seen through the hole behind the DIC. It has a pink wire and a black wire going to it, after 91 there is a third wire, tan.

The easiest thing to do is to remove the DIC and remove the 2 light bulbs or you can also remove the cruise control fuse, which will also disable illumination of the LTPWS lights; of course, that option disables the cruise control function.

Thanks to Jim VanDorn and Jerry Watts for this information.

Viewed: 19 times • Created on: 4/26/2012 • Modified on 4/26/2012

More reference material from the Registry:

http://www.zr1netregistry.com/Portals/0/Downloads/GM%20Body%20Systems%20Application%201988-2004.pdf

Check under Vehicle Coverage '90MY and compare to '91MY

With sensors removed from my '91 (1746), the light in fact came on.
Marc Haibeck removed the bulbs.

Many here report no light on their '91 so I have wondered if there was a point in '91 production that it changed. I don't know - just sayin it was not the case for me.

[WVZR-1]

I will drive it a few times and see if it turns on again.

It turned on about 100 ft from my mechanics , and he didn't say he noticed it when he test drove it.

Thanks for the procedure though.

If the wheels I installed have sensors in them from lets say a 93' Car, would that interfere with my 90' system or would they just not communicate? ---

They shouldn't communicate! I guess it's become apparent we need to stress "shouldn't"!

Do the CCM fuse removal, wait, then a cycle of the key "on/off/remove" - insert "key-on" we'll assume "no light"!

[alwayscode390]

Gotcha ... I will go for the fuse first , if it is still lit up the next time I start the car :) ---

[alwayscode390]

http://i46.tinypic.com/x1m0au.jpg

Well I got the car out yesterday and the light lit up within 100 feet again :( ... time to go for the jumper on the ALDL , then the fuse trick I guess.

Why do they make this light so much brighter than the FULL POWER light?! LOL .

Just to make sure, this doesn't cut any engine power output, right?

If everything else doesn't work, next step is to get my mechanic to clear the code with their professional obd1 reader? ---

[scottfab]

This is just covering bases, sorry.
And what is the pressure right now is all three tires?;)

[alwayscode390]

LOL , I'll go check ... but I didn't even swap out the sensors.

I seriously didn't think I had them in the repro a-molds , and figured it wasn't worth the money even if they were in there to swap them out ... as long as it didn't throw a code I was going to be happy :) ---

[alwayscode390]

OK, checked tire pressures, they WERE low ... about 25 lbs front and rear. That's what I get for assuming the mechanics that mounted them aired them up right.

Is the pressure sensors immediate ... as in , if I drive to air the tires up with the light on the dash ... then I stop to put air in , will the light go off on the drive home?

My light stayed on and I put 35lbs in the tires just to make sure it was enough.

Thanks :) ---

[secondchance]

OK, checked tire pressures, they WERE low ... about 25 lbs front and rear. That's what I get for assuming the mechanics that mounted them aired them up right.

Is the pressure sensors immediate ... as in , if I drive to air the tires up with the light on the dash ... then I stop to put air in , will the light go off on the drive home?

My light stayed on and I put 35lbs in the tires just to make sure it was enough.

Thanks :) ---

It should go out after air and restart of the motor.

[alwayscode390]

OK, I didn't restart the engine. I had plans yesterday night, and figured it would be the time I shut the car off that it wouldn't want to restart LOL.

Thanks for the patience guys ... its not my DD :D ---

[scottfab]

OK, checked tire pressures, they WERE low ... about 25 lbs front and rear. That's what I get for assuming the mechanics that mounted them aired them up right.

Is the pressure sensors immediate ... as in , if I drive to air the tires up with the light on the dash ... then I stop to put air in , will the light go off on the drive home?

My light stayed on and I put 35lbs in the tires just to make sure it was enough.

Thanks :) ---

Don't worry about it. Many of us have done this. My first experience with a real low pressure situation was similar since I had just fixed one of them a few months before. When it came on again I just assumed it was the same sensor. Wrong! When I went to have the tire dismounted the guy said it was low and had a nail in it.... doooogh
That's why when it comes to safety devices in the car I don't just rip them out. I fix them.

The light should go out by itself after 10 or so minutes of driving. Remember there are two lights. One says low tire pressure the other says "LTPWS" Low Tire Pressure Warning System. The later means there is a pressure reporting problem. (usually a tire not reporting in on time) If you have the later there are several TechNet articles on it.

[alwayscode390]

FINALLY got the car on a 45 minute cruise ... been snowing the past month.

This car LOVES the 70 degree weather.

Swapped out the battery for an Odyssey ... and not sure if that's why the Low Pressure sensor went off ... but it STAYED off ... WOO HOO!!!

Looks like these my93 sensors are working with the my90 stuff in my car. ---

[KILLSHOTS]

Hello all!

Sorry to be getting in on such an old thread, but I know some of you experts will chime in with the right advice...

Just had the clutch replaced in my '90 and it returned to me with a terrible rattle/jingle/whatchamacallit noise. We thought it was clutch-related (the most obvious) but after a lot of investigation, we found that the tpms band came loose from the right-front wheel (coincidentally with the clutch repairs) and is just rattling around inside the tire. Makes sense since LTPWS has also been on and won't go off. OK, now to my question...

One sensor's obviously done for, and I want the others GONE while I'm at it, no reason to keep them. I've read somewhere that the '90 is the only year on which you can just remove the sensors and be done with the whole system. No more LTPWS light or anything. IS THIS TRUE? Can I just remove the bands from all 4 wheels and be done with the rattle, the warning light and everything else?

Thanks for everybody's help, as always. Have a great evening!
Chris

[GOLDCYLON]

The 90 and the 91 yes. Or replace the sensor and band or pull the bulb in the DIC. Scott posted above is the only 91 that refused to turn off the light.

[KILLSHOTS]

The 90 and the 91 yes. Or replace the sensor and band or pull the bulb in the DIC. Scott posted above is the only 91 that refused to turn off the light.
Thank you sir! It's Daryl, correct? I met Phillip and Lorne and Bill with the '63 LT5 SW up at Windgate last weekend and they all had nice things to say about you. Hope to meet you soon.

Chris

[PhillipsLT5]

All 4 of mine are gone, no light on, light does come on when I turn the key to start, think about these very old parts at high speed coming loose, not for me, I just use air pressure gauge, how simple, glad you are getting it sorted out

[KILLSHOTS]

All 4 of mine are gone, no light on, light does come on when I turn the key to start, think about these very old parts at high speed coming loose, not for me, I just use air pressure gauge, how simple, glad you are getting it sorted out
That's exactly what I figured; no need to have all that stuff in there anymore, and the right front breaking loose is just a good excuse to get rid of all of them.

Got my emissions exemption and tags, so I look forward to seeing you again real soon. Thanks for all your help, Phillip. Have a great weekend!

Chris

[GOLDCYLON]

Thank you sir! It's Daryl, correct? I met Phillip and Lorne and Bill with the '63 LT5 SW up at Windgate last weekend and they all had nice things to say about you. Hope to meet you soon.

Chris


Hey there thats me. Yep hope to be out at the pavilions on 5 April. If i can swing it. Yep great group of fellars you mention there. Daryll :)

[scottfab]

...snip...
One sensor's obviously done for, and I want the others GONE while I'm at it, no reason to keep them. I've read somewhere that the '90 is the only year on which you can just remove the sensors and be done with the whole system. No more LTPWS light or anything. IS THIS TRUE? Can I just remove the bands from all 4 wheels and be done with the rattle, the warning light and everything else?

Thanks for everybody's help, as always. Have a great evening!
Chris

Chris,
The sensors for 90, 91 and 92 are the same.
I've learned to inspect and fix mine when getting new shoes (tires).
I value this safety feature. It's hard to get out and check with a manual gauge when your run over something sharp. Also,
they are no more likely to fail due to age than the LT5. They are sealed in a pocket of air not exposed the petrol chemicals which are indeed bad for plastic. I did some research on this about a decade ago. I also found and fixed two of the most common failures.
http://zr1netregistry.com/Information/TechNet/%5BAllArticles%5D/tabid/262/articleType/ArticleView/articleId/103/Low-Tire-Pressure-Sensor-LTPS-Revisited.aspx
Here are part #s FYI
89 - 92
RF (blue) - 10098494
LF (green) - 10098495
RR (orange) - 10098496
LR (yellow) - 10098497

93 - 96
LR -10161854
RF -10161855
LF - 10161856
RR - 10161857

[ztheusa]

I removed the sensors from my 91' and got no light.

[KILLSHOTS]

Chris,
The sensors for 90, 91 and 92 are the same.
I've learned to inspect and fix mine when getting new shoes (tires).
I value this safety feature. It's hard to get out and check with a manual gauge when your run over something sharp. Also,
they are no more likely to fail due to age than the LT5. They are sealed in a pocket of air not exposed the petrol chemicals which are indeed bad for plastic. I did some research on this about a decade ago. I also found and fixed two of the most common failures.
http://zr1netregistry.com/Information/TechNet/%5BAllArticles%5D/tabid/262/articleType/ArticleView/articleId/103/Low-Tire-Pressure-Sensor-LTPS-Revisited.aspx
Here are part #s FYI
89 - 92
RF (blue) - 10098494
LF (green) - 10098495
RR (orange) - 10098496
LR (yellow) - 10098497

93 - 96
LR -10161854
RF -10161855
LF - 10161856
RR - 10161857
Thanks for the info, Scott. I went ahead and pulled them, though. In the final analysis, the '87 vert that I traded on my Z didn't have them, and I only drive a couple thousand miles a year anyway.

Worked fine, no lights anymore.

Cheers!
Chris

[scottfab]

Thanks for the info, Scott. I went ahead and pulled them, though. In the final analysis, the '87 vert that I traded on my Z didn't have them, and I only drive a couple thousand miles a year anyway.

Worked fine, no lights anymore.

Cheers!
Chris

Well go ahead and sell them. I bet someone will scoop them up :dancing

[KILLSHOTS]

Well go ahead and sell them. I bet someone will scoop them up :dancing
My thoughts exactly! Can you believe Eckler's has those things listed for $270 apiece? WOW!