w/ the above, and I've got the same issue on my 90 - seat belt and SIR warning light. 90% of the time, you need to clean the sensor grounds, and clear the codes. typical 90 problem. 
90 Lights on dash
Thread Starter
Racer
Joined: Jan 2014
Posts: 288
Likes: 10
From: Proctor WV
90 Lights on dash
Picked up a 90 coupe the other week. The seat belt warning light is on and stays on when seat belts are on...Thinking PO unhooked wire under seat....Also inflatable restraint light is on, PO said he took it to dealer. Told him couldn't get light to go out...lol Workin on getting FSM, New 4 post lift ordered. Getting to be the dreaded season out there....Time for shop and heaters...Any ideas till I get shop manual? Thanks ziggy
Team Owner
Joined: Sep 2003
Posts: 25,394
Likes: 2,741
I would say that you've got an issue with one of the sensors for the SIR and that will light both the DIC and the seatbelt icon in the cluster. It could be either side for the sensor error and there are numerous threads regarding the fix. Search is your friend for this. There are so many threads it's difficult to point you to a particularly good one.
Safety Car
Joined: Mar 2005
Posts: 4,471
Likes: 1,224
From: Fredonia WI
2025 Corvette of the Year Finalist - Unmodified
2024 C7 of the Year Winner - Unmodified
2023 C4 of the Year Finalist- Modified
2020 C4 of the Year Finalist - Modified
2019 C4 of Year Finalist (performance mods)
2018 C4 of Year Finalist
You likely don't have to replace the airbag sensors, just clean the connections. Getting to the sensors requires some time, but once you unbolt them, you'll see that the mounting surfaces need to be cleaned up.
Melting Slicks
Joined: Sep 2008
Posts: 2,376
Likes: 111
From: Cherokee National Forest TN
After cleaning both sensors I added an external star lock washer to one of each sensor retaining bolts with a ground wire to other frame bolts.
The shop manual will give the sequence to eliminate the trouble lights. Timing the ground/no ground within 1/2 second can be tricky. A clock with a ticking second hand worked well for me.
Good luck.
The shop manual will give the sequence to eliminate the trouble lights. Timing the ground/no ground within 1/2 second can be tricky. A clock with a ticking second hand worked well for me.
Good luck.
Thread Starter
Racer
Joined: Jan 2014
Posts: 288
Likes: 10
From: Proctor WV
Got my FSM , new lift will be here next week..26 degrees here tonight. Took the 90 out to top off fuel and Stabil for winter storage. Good time to sit by fire an read...lol Not a big fan of winter. Thanks for your help, Ziggy
Last edited by Ziggy*; Nov 15, 2014 at 10:03 PM.
Safety Car
Joined: Mar 2005
Posts: 4,471
Likes: 1,224
From: Fredonia WI
2025 Corvette of the Year Finalist - Unmodified
2024 C7 of the Year Winner - Unmodified
2023 C4 of the Year Finalist- Modified
2020 C4 of the Year Finalist - Modified
2019 C4 of Year Finalist (performance mods)
2018 C4 of Year Finalist
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Thread Starter
Racer
Joined: Jan 2014
Posts: 288
Likes: 10
From: Proctor WV
Drifting
Joined: Jan 2003
Posts: 1,894
Likes: 3
From: Reading PA.
The sensors are on the frame rails close to the firewall disconnect the battery and wait a few minutes before doing any work. Remove the sensors and take a Dremel tool and sand the frame where the sensor sits and also the bottom of the sensor. Apply a coat of dielectric grease to the cleaned area. You could also put star washers on the bolts to help make a better ground when re attaching. Get yourself the mid America kit to remove the codes which hooks to the Aldl connector and then you go through the sequence to remove the code. The timing is very important to removing it. It might take a few tries. The kit is 20 bucks good luck. Pipe
Thread Starter
Racer
Joined: Jan 2014
Posts: 288
Likes: 10
From: Proctor WV
Pipe, Thanks for reply. Looked in Mid America catalog for 'kit". Couldn't find or online either??? Are you talking about one of those little Aldl plug in code scanners for OBD1? Hope you are enjoying all the snow you got.....Got about 1" here, but melting. Thanks ziggy
Thread Starter
Racer
Joined: Jan 2014
Posts: 288
Likes: 10
From: Proctor WV
Think I found what you were talking about in Ecklers catalog. The "Key" for pulling codes. I use a wire for "ECM" related problems. Made up a micro switch with wires for the "SIR" system. Plug in to pins "A" to "K", Stop watch in hand should do the trick. ziggy
Thread Starter
Racer
Joined: Jan 2014
Posts: 288
Likes: 10
From: Proctor WV
Update
Pulled both side panels, To check on grounds for "SIR" . Added star washers while I was in there, They were cleaned ...Thinking maybe the "TECH" couldn't clear the code...."LIL" woman with stopwatch,an your guys help /plus FSM....no lights....One more happy 90 Corvette, plus owner....Took two times an one nasty look to pay attention to get her done...Thank you again
Drifting
Joined: Jan 2003
Posts: 1,894
Likes: 3
From: Reading PA.
Hey zingy it says in the mid America catalogue infl rest reset tool. It plugs into the Aldl connector under the dash. It has a momentary contact button that ya just time it with a watch. Your welcome to use mine if ya like. Pipe
Thread Starter
Racer
Joined: Jan 2014
Posts: 288
Likes: 10
From: Proctor WV
Pipe, Thanks for your offer...Found what you were talking about on internet catalog. Made my own using micro switch....Took two times to get light off, all is well. Merry Christmas Ziggy