Inf Rest light stays on>>> - ZR-1 Net Registry Forums

ZR1Vette · 12-03-2011

Ran diagnostics via ALDL (Grnd + K pin) and get a code 16... according to the manual that is Front Sensor #1 (LH); Sensor Fault

To me LH obviously means Left Hand which would be the sensor under the battery tray... correct? In the Trouble Shooting section of the ZR-1 Registry KBase posted a DIY Inf Rest Light on 1990 jCorvettes and states a code 16 is for the sensor on the RIGHT side under the windshield wiper water reservoir... I tend to believe the manual of course, but want to make sure my assumption is correct.

Also, when code 16 states "sensor fault" (as per the manual) is that a failed sensor (thus needs replacing) or is it the corrosion issue of the sensor to chassis contact points?

Thanks for any insights!

GOLDCYLON · 12-03-2011

Hopefully its just a cororsion issue at the frame. a little cleaning preping and dyelectric grease should take care of it. Make sure you clean the Front #1 Sensor and the mounting seurface and use the grease between the uniframe and the sensor. Remove all the rust

LH according to GM and my understanding refers to the Driver side of the car. I have seen numerious GM LT-5 Diagrams and the LH side is always the drivers side.

also after performing this function dont forget to clear out the codes. Since you dont have a tech-1 but a trusty paperclip

Make sure the ignition is off before you start

Ground the ALDL Termal A to K. A is the grounding terminal BTW

Turn the ignition on and wait for the INFL Rest light to start flashing (It should take about 5-7 Seconds)

When it starts flashing unplug the A-K for about 3 seconds then ground it again for an additional 3 seconds.

Remove and wait about ten seconds and ground it once more

You should see a code 12 flashing 6 times indication the codes have been cleared and the DERM is operating normally (Dignostic Energy Reserve Module)

Good luck. GC

ZR-1nce removed · 12-03-2011

Michael,
When I had the same problem, Gordon K told me to ignore the manual and clean and replace the sensor under the washer reservoir on the right side. My light has never come back on. I would start there...

GOLDCYLON · 12-04-2011

Actually that would be a Code 26 Front Sensor #2 RH side sensor.

For GP I would service both sides. I would not however ignore the codes the car set. I would start with the LH first as indicated. GC

tomtom72 · 12-04-2011

one more from the peanut gallery....usually it's the grounding issue. The sensors are fairly simple inside so usually they are not likely the cause of the DTC.

The clearing codes procedure is somewhat troublesome. The timing on the grounding and ungrounding the pin has about 1,5 second window. If you have a Tech1A then it's no sweat. If not, I used a stop watch and rigged up a door bell button to do the mechanical work of grounding. The real key is the timing, or at least that's what I found.

Oh, and the passenger side sensor is a bit tuff to work on and it appears that the washer bottle should come out. That is one way, but you can get it without removing the bottle. It just takes some patience.

Tom

jrd1990zr1 · 12-04-2011

You should also check the connector inside the car under the rug in the foot well. My codes would not clear until I cleaned the connector with electrical contact cleaner. Then the derm reset.

ZR1Vette · 12-04-2011

Thanks guys... between your pointers, the service manual and the Tech Tips I am ready to tackle the project. I will take pics and write something up as to what I find/do.

ZR1Vette · 12-06-2011

In this picture (LH side with battery removed) can the air bag (LH) sensor be seen? or is it buried behind/under battery tray>>>

Thanks

tomtom72 · 12-06-2011

Mike, The sensor can only be seen if you are standing up. It is just beyond the front inner edge of the battery tray. On the frame rail, buried under a wiring harness and up against the wheel house liner. It is hidden and it's black in color so it matches the frame rail and hides pretty good. Great camo job by the factory.

Where the mess of wires is in the photo look on the frame in that spot. I just thought of this....senile old fool that I am. I may not be remembering correctly, you may have to remove the battery tray...I can't remember it's been so long. I know I had to look for it as it hides so well...sorry Mike!

ZR1Vette · 12-06-2011

Tom...
Not senile

since you remember exactly what has been written etc. Just was trying to find out where the sensor is in more specific terms and you have done that...
Thanks

12-03-2011	#3
ZR-1nce removed Join Date: Jan 2009 Location: Gettysburg, PA Posts: 247	Re: Inf Rest light stays on>>> Michael, When I had the same problem, Gordon K told me to ignore the manual and clean and replace the sensor under the washer reservoir on the right side. My light has never come back on. I would start there... __________________ 90 ZR-1 #0951 Bright Red (sold) 06 Z51 MN6 Velocity Yellow (sold) 2023 C-8 Z51 ELB WAZOO Member

12-04-2011	#4
GOLDCYLON Join Date: May 2007 Location: Peoria, AZ Posts: 9,155	Re: Inf Rest light stays on>>> Actually that would be a Code 26 Front Sensor #2 RH side sensor. For GP I would service both sides. I would not however ignore the codes the car set. I would start with the LH first as indicated. GC __________________ GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director 91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V

12-04-2011	#5
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,645	Re: Inf Rest light stays on>>> one more from the peanut gallery....usually it's the grounding issue. The sensors are fairly simple inside so usually they are not likely the cause of the DTC. The clearing codes procedure is somewhat troublesome. The timing on the grounding and ungrounding the pin has about 1,5 second window. If you have a Tech1A then it's no sweat. If not, I used a stop watch and rigged up a door bell button to do the mechanical work of grounding. The real key is the timing, or at least that's what I found. Oh, and the passenger side sensor is a bit tuff to work on and it appears that the washer bottle should come out. That is one way, but you can get it without removing the bottle. It just takes some patience. Tom __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member

12-04-2011	#6
jrd1990zr1 Join Date: Dec 2005 Location: Delanson, NY Posts: 915	Re: Inf Rest light stays on>>> You should also check the connector inside the car under the rug in the foot well. My codes would not clear until I cleaned the connector with electrical contact cleaner. Then the derm reset. __________________ 1968 convertible Lemans Blue, 1986 coupe Medium Blue NCRS Top Flight (sold), 1990 ZR1 #2529 Red NCRS Regional and National Top Flight (sold), 1990 ZR1 #2124 Charcoal Metallic NCRS Top Flight 2010 & 2018, 2003 Anniversary Red Convertible (sold)

12-04-2011	#7
ZR1Vette Join Date: Dec 2007 Location: Reston, Virginia Posts: 939	Re: Inf Rest light stays on>>> Thanks guys... between your pointers, the service manual and the Tech Tips I am ready to tackle the project. I will take pics and write something up as to what I find/do. __________________ Michael :cheers: [I][SIZE="2"]1990 RED on RED #566[/SIZE][/I] [I][SIZE="2"]WAZOO MEMBER[/I][/SIZE]

12-03-2011	#1
ZR1Vette Join Date: Dec 2007 Location: Reston, Virginia Posts: 939	Inf Rest light stays on>>> Ran diagnostics via ALDL (Grnd + K pin) and get a code 16... according to the manual that is Front Sensor #1 (LH); Sensor Fault To me LH obviously means Left Hand which would be the sensor under the battery tray... correct? In the Trouble Shooting section of the ZR-1 Registry KBase posted a DIY Inf Rest Light on 1990 jCorvettes and states a code 16 is for the sensor on the RIGHT side under the windshield wiper water reservoir... I tend to believe the manual of course, but want to make sure my assumption is correct. Also, when code 16 states "sensor fault" (as per the manual) is that a failed sensor (thus needs replacing) or is it the corrosion issue of the sensor to chassis contact points? Thanks for any insights! __________________ Michael :cheers: [I][SIZE="2"]1990 RED on RED #566[/SIZE][/I] [I][SIZE="2"]WAZOO MEMBER[/I][/SIZE]

12-03-2011	#2
GOLDCYLON Join Date: May 2007 Location: Peoria, AZ Posts: 9,155	Re: Inf Rest light stays on>>> Hopefully its just a cororsion issue at the frame. a little cleaning preping and dyelectric grease should take care of it. Make sure you clean the Front #1 Sensor and the mounting seurface and use the grease between the uniframe and the sensor. Remove all the rust LH according to GM and my understanding refers to the Driver side of the car. I have seen numerious GM LT-5 Diagrams and the LH side is always the drivers side. also after performing this function dont forget to clear out the codes. Since you dont have a tech-1 but a trusty paperclip Make sure the ignition is off before you start Ground the ALDL Termal A to K. A is the grounding terminal BTW Turn the ignition on and wait for the INFL Rest light to start flashing (It should take about 5-7 Seconds) When it starts flashing unplug the A-K for about 3 seconds then ground it again for an additional 3 seconds. Remove and wait about ten seconds and ground it once more You should see a code 12 flashing 6 times indication the codes have been cleared and the DERM is operating normally (Dignostic Energy Reserve Module) Good luck. GC __________________ GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director 91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V Last edited by GOLDCYLON; 12-03-2011 at 06:19 PM.

12-06-2011	#8
ZR1Vette Join Date: Dec 2007 Location: Reston, Virginia Posts: 939	Re: Inf Rest light stays on>>> In this picture (LH side with battery removed) can the air bag (LH) sensor be seen? or is it buried behind/under battery tray>>> Thanks __________________ Michael :cheers: [I][SIZE="2"]1990 RED on RED #566[/SIZE][/I] [I][SIZE="2"]WAZOO MEMBER[/I][/SIZE]

12-06-2011	#9
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,645	Re: Inf Rest light stays on>>> Mike, The sensor can only be seen if you are standing up. It is just beyond the front inner edge of the battery tray. On the frame rail, buried under a wiring harness and up against the wheel house liner. It is hidden and it's black in color so it matches the frame rail and hides pretty good. Great camo job by the factory. Where the mess of wires is in the photo look on the frame in that spot. I just thought of this....senile old fool that I am. I may not be remembering correctly, you may have to remove the battery tray...I can't remember it's been so long. I know I had to look for it as it hides so well...sorry Mike! __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member Last edited by tomtom72; 12-06-2011 at 09:24 AM.

12-06-2011	#10
ZR1Vette Join Date: Dec 2007 Location: Reston, Virginia Posts: 939	Re: Inf Rest light stays on>>> Tom... Not senile since you remember exactly what has been written etc. Just was trying to find out where the sensor is in more specific terms and you have done that... Thanks __________________ Michael :cheers: [I][SIZE="2"]1990 RED on RED #566[/SIZE][/I] [I][SIZE="2"]WAZOO MEMBER[/I][/SIZE]