Inst Rest light on
Thread Starter
Intermediate
Joined: Oct 2008
Posts: 35
Likes: 0
Inst Rest light on
MY "INST REST" LIGHT IS ON AS WELL AS MY LITTLE GUY WITH THE SEAT BELT. I WAS WONDERING WHAT IT WILL TAKE TO TURN THE LIGHT OUT OR WIDTH OF BLACK TAPE TO USE. I have a 1990 Corvette.
jdfrank
jdfrank
Instructor
Joined: Sep 2008
Posts: 152
Likes: 0
From: Petersburg Virginia
I had the same problem. You have to remove the sensors that are attached to the frame sand the corrosion off of the frame apply dieelectric grease to bottom of sensor replace sensor then reset code. There was a thread on this topic a few months back with the steps and reset procedure to get rid of the INF REST light and seat belt light. Do a search. If the sensors are bad they will have to be replaced to clear the lights. Or you could go in and take out the bulbs
Drifting
Joined: Jan 2003
Posts: 1,894
Likes: 3
From: Reading PA.
This happens on alot of 90s mine also a few years back. Before doing any work on the INFL REST system DISCONNECT YOUR BATTERY! The sensors are located on the frame rails close to the firewall. After removing them take a Dremel tool or small grinder and clean the paint and corrosion off the frame rail where the sensor sits and sand the bottom of the sensor also. Apply some Dielectric Grease to the bottom of the sensor and frame where you grinded then reinstall the sensor. I also put a star washer on the bolt when reinstalling to help make a better ground. You will need to re set the lights and clear the code. Mid America sells a little code clearing tool for $20. If cleaning the frame and sensors don't work then you have a bad frame sensor and i'm not sure if you can get them anymore from GM 
Pipe p.s. the frame sensors have a OHM spec to test to see if they are ok
Pipe p.s. the frame sensors have a OHM spec to test to see if they are ok
Team Owner
Joined: Dec 1999
Posts: 34,873
Likes: 487
From: Lacey WA RVN 68-69
NCM Sinkhole Donor
And when you disconnect the battery, you should wait for about 10 minutes or so before working on the sensors.. That will allow any residual voltage in the airbag sensors to bleed off.
Drifting
Joined: Jan 2003
Posts: 1,894
Likes: 3
From: Reading PA.
The pigtail connector for the frame sensor is down in the footwell area. Peel back the carpet down where your feet would be if you were streched out. It's a small yellow colored plug with 3 prongs in it. I've heard sometimes that these plugs come apart but not often. I have the OHM SPECS here if ya need em. Pipe
Pro
Joined: Jun 2007
Posts: 626
Likes: 2
From: Coquitlam British Columbia
The pigtail connector for the frame sensor is down in the footwell area. Peel back the carpet down where your feet would be if you were streched out. It's a small yellow colored plug with 3 prongs in it. I've heard sometimes that these plugs come apart but not often. I have the OHM SPECS here if ya need em. Pipe
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Drifting
Joined: Jan 2003
Posts: 1,894
Likes: 3
From: Reading PA.
UNCLEBILL yep a code 41 indicator lamp circut, shorted to battery or ground. Hmm usually the DERM isn't the culprit. I wonder where it's shorted at? It would be nice to track down the problem instead of pulling the bulb. Pipe
Pro
Joined: Jun 2007
Posts: 626
Likes: 2
From: Coquitlam British Columbia
Yes I would like to know also; but how do I check for a bad circuit if I cant use a multimeter? I have the bare basics in this matter.
Pro
Joined: Jun 2007
Posts: 626
Likes: 2
From: Coquitlam British Columbia
The right sensor is on the frame rail under the blower fan. You will have to take the fender off to get at it. ...2 bolts hold it to the frame rail.
Last edited by UNCLEBILL; Dec 21, 2008 at 08:37 PM.