1990 GM Service Bulletins

[jrd1990zr1]

Anyone know of a source for these? Looking for a copy of Bulletin 90-436-9J.

Thanks, John

[Aurora40]

If you are a registry member, they have them on the members site.

[jrd1990zr1]

If you are a registry member, they have them on the members site.

Thanks, I had planned to join this looks like another good reason.

[tomtom72]

90-436-9J relates to the fromunda crud on the mounting ear of the air bag sensors. Oh, I forgot, "fromunda" = From under, that's NYeese for under.

I've been told that Grodon Killabrew(Foryourcar.com) said to clean the corosion at the mounting bolt & brkt & spot on the frame for the bolt boss. Use di-electric grease and add a star washer and re-mount the sensor. I think water has a way of laying there sometimes and causes a bad ground condition.

I don't /didn't get any codes on my car but as I had the battery out I went ahead & did the driver's side sensor. The passenger side I have yet to do so I can offer no "insight" to the method of getting to that sensor.

Driver's side is easy: Discon battery, remove left rocker panel, remove gill panel & note position of upper shim, remove battery & tray, and air bag sensor is in view on the frame. Yellow wire, large & labeled is the tell tail to the sensor(black box about 2" sq). I would discon batt first before doing anything on the body panels as the warnings about dis-charge of air bad say to wait at least 15 min. before working on SIR wiring & components. Helm manual says that in the "cautions". I followed the "caution". You need torx bits and 13 & 10mm sockets & 1/4" rachet set works fine or 3/8" rachet set. I find the 1/4" set easier to use on stuff like this.

:cheers:
Tom

[bobbyhi]

I have had my air bag light on for over two years now. I have taken both sensors out twice and cleaned them. Tried to clear the code to no avail so I purchase the code clearing gizmo from Corvette Central and still no luck. I just live with the light. Would like to clear but nothing seems to work for me. Would welcome any suggestions!!!!!

[jrd1990zr1]

90-436-9J relates to the fromunda crud on the mounting ear of the air bag sensors. Oh, I forgot, "fromunda" = From under, that's NYeese for under.

I've been told that Grodon Killabrew(Foryourcar.com) said to clean the corosion at the mounting bolt & brkt & spot on the frame for the bolt boss. Use di-electric grease and add a star washer and re-mount the sensor. I think water has a way of laying there sometimes and causes a bad ground condition.

I don't /didn't get any codes on my car but as I had the battery out I went ahead & did the driver's side sensor. The passenger side I have yet to do so I can offer no "insight" to the method of getting to that sensor.

Driver's side is easy: Discon battery, remove left rocker panel, remove gill panel & note position of upper shim, remove battery & tray, and air bag sensor is in view on the frame. Yellow wire, large & labeled is the tell tail to the sensor(black box about 2" sq). I would discon batt first before doing anything on the body panels as the warnings about dis-charge of air bad say to wait at least 15 min. before working on SIR wiring & components. Helm manual says that in the "cautions". I followed the "caution". You need torx bits and 13 & 10mm sockets & 1/4" rachet set works fine or 3/8" rachet set. I find the 1/4" set easier to use on stuff like this.

:cheers:
Tom

Thanks Tom,

Just took Gordon's class last week. Both he and Chris are great people.

I was looking for the bulletin just to double check myself as I go thru the process. Gordon said to be careful with the di-electric grease, it does not conduct electricity.

BTW, I'm from upstate, haven't heard "fromunda" before. Must be a downstate phrase.

Thanks again, Regards, John

[tomtom72]

Hi John:hello: Man I'm envious of you taking class with Gordon....that's my dream to scrape together enough $ to go the whole route so I can understand this car! It's alot different than my last vette, a 72....and I thought that car was hard to work on!:sign10:

I haven't done the passenger side yet but if I do I'll report back to this thread on what I find out about how to do it...I know I eye balled it some time ago...I think Aurora40 did his and has some insight into the procedure??

Oh almost forgot, this may be of help. I was over in the C4 section at Corvette Forum and saw an interesting thread about the infl rest light. One member over there had a way to test the sensors and the steering wheel separately. If I can find the thread I'll try to do a link to it. I just have to do a search as it was all new to me & very interesting.

Good luck
Tom

[tomtom72]

Okay now everyone will know the depth of my P/C skills.....:sign10:

Over at CF in the C4 Tech/performance section on page 2 there is a thread titled "What does "INFL REST" mean?", see reply #5 for the diagnostic procedure I was referring to in my previous post.

Sorry about the road map....some day I just may get the hang of this P/C stuff!:o

:cheers:
Tom

[jrd1990zr1]

Hi John:hello: Man I'm envious of you taking class with Gordon....that's my dream to scrape together enough $ to go the whole route so I can understand this car! It's alot different than my last vette, a 72....and I thought that car was hard to work on!:sign10:

I haven't done the passenger side yet but if I do I'll report back to this thread on what I find out about how to do it...I know I eye balled it some time ago...I think Aurora40 did his and has some insight into the procedure??

Oh almost forgot, this may be of help. I was over in the C4 section at Corvette Forum and saw an interesting thread about the infl rest light. One member over there had a way to test the sensors and the steering wheel separately. If I can find the thread I'll try to do a link to it. I just have to do a search as it was all new to me & very interesting.

Good luck
Tom

Tom,

Gordon's class is a MUST!!! There is nothing he doesn't know. He and Chris are great. Wish I had planned ahead to stay in town for the gathering last weekend. Maybe next year.

Diagonosed my car, got a code 16 & 26. Looks like I am going to have to clean up the sensors.

If you are going to be up in the Albany area, drop me an e-mail.

John

[tomtom72]

:thumbsup: John! When I get squared away with my Z for the season I'll for sure drop a line...any excuse to drive mine more than 50 miles, no need to twist my arm!:sign10:

:mrgreen:
Tom

[Tom]

On my '90 the air bag computer had to be replaced to get the INFL REST light to go out.

[bobbyhi]

Tom, tell me more about the computer replacement. How/who found that was the problem? How can you tell????