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Topic: INFL REST and Seatbelt light

in Forum: C4 Electrical


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INFL REST and Seatbelt light (1/11)
 12/15/09 7:38pm
hem
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Charlestown, IN - USA

Vette(s):
1990 Convertable Red w/White top


Joined: 12/15/2009
Posts: 3

Both INFL REST and Seatbelt light stay on all of the time on a 1990 convertable. Is this a common problem? Is there an easy fix?

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INFL REST and Seatbelt light (2/11)
 12/16/09 12:12am
Adams' Apple
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Duncanville, TX - USA

Vette(s):
1985 Coupe-L98/Auto,Bright Red/Carmine. 1974 Coupe-L48/4speed, Medium Red Metallic/Black Deluxe.


Joined: 3/18/2009
Posts: 2230

Hard to determine the fix until the problem is diagnosed. I would suggest having someone check for codes, and go from there. It could be something as simple as a blown fuse, so you might want to start by checking the fuses, and then go from there.
Your local AutoZone(if you have one) should be able to scan it, and give you a print out of any codes.


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INFL REST and Seatbelt light (3/11)
 12/16/09 8:30am
hem
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Charlestown, IN - USA

Vette(s):
1990 Convertable Red w/White top


Joined: 12/15/2009
Posts: 3

I will try Autozone. Thanks

INFL REST and Seatbelt light (4/11)
 12/16/09 9:00am
Adams' Apple
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Duncanville, TX - USA

Vette(s):
1985 Coupe-L98/Auto,Bright Red/Carmine. 1974 Coupe-L48/4speed, Medium Red Metallic/Black Deluxe.


Joined: 3/18/2009
Posts: 2230

btw...most places like AutoZone will do the code check for free...

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Joel Adams  
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

INFL REST and Seatbelt light (5/11)
 12/17/09 2:06pm
hwatkins
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Chester, SC - USA

Vette(s):
1993 Convertible Quasar Blue


Joined: 3/20/2009
Posts: 17

Hem, this might be a long- shot, but you never know.
 
I installed an R & D brace between the 2 shoulder belt pillars on my '93 convertible and experienced the same lights staying on. While trying to tighten the mounting bolt to the pillar behind the passenger seat side, the nut inside the pillar had come loose from the welded tack. I had to remove the carpeting and un-bolt the pillar from the floor. That's when I could feel a wiring harness inside the pillar.
Immediately after this installation is when the lights stayed on. Sure enough, I had disturbed the  connection on that harness when I had reached inside with a tool to hold the mounting bolt. All I had to do (whew!) was remove the brace, go back inside the pillar, and unplug, then re-plug the harness connectors.
 
Maybe that harness has worked it's way loose on your Vette.
As mentioned, just a guess.
 
HKW
INFL REST and Seatbelt light (6/11)
 12/17/09 8:53pm
Dan Skopp
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Oak Creek, WI - USA

Vette(s):
1981, think about getting a 1992.


Joined: 10/11/2009
Posts: 75

Got any pictures of your 93 HKW????  I would love to see your vette!!
DanHug
INFL REST and Seatbelt light (7/11)
 12/23/09 1:06pm
UNCLEBILL
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, - Canada

Vette(s):
1990 VERT..CHARCOAL METALLIC


Joined: 3/20/2009
Posts: 3

This is a common problem on 1990. Check for code(s). Go to terminal under drivers side dash on right side. I like to ground on the driver seat and connect other end to Terminal "K"..2nd row 3rd from right. The Rest. lite will blink code 12 (1long-2 short) 3 times..after this the default codes will start blinking ..3 times for each default(s) and then finish with 3 times for code 12 again. Most likely you will see a code 26 as this is the majority of problems. This represents the air bag sensor on the passenger side. Disconnect the battery ..and now the fun begins. You have to take off the side fender and possibly the inner fender to get at the sensor under the rad. reservoir. There are 2 bolts holding it down(tight and cramp spacingCry). When off; sand the frame area and the underside of the sensor well to remove any corrosion if any and apply dielectric grease to the surfaces. (***this was GM's fix to this problem for 1991Shocked). Reassemble and connect battery. Now comes more fun....to clear code(s) for Rest. lite AND seat belt lite...turn ignition on but not to turn over engine.....connect to K terminal  and ground(seat)..wait for the 3-12 code flashes then start this clear process....unground for 3 sec...ground for 3 sec....unground for 3 sec. and ground for 3 sec....unground for 3 sec. and ground for 3 sec...UNGROUND for 10 sec. and turn key off. It IS IMPORTANT that your timing is EXACT..you only have a +/- 1/2 sec. window of tolerance or you may be doing this proceedure over many times.
The other sensor(drivers side) is under the battery on the frame rail and that is code 25 I believe.
If you do not have a FSM: do not attempt to check with a Digital multi meter as the battery from this can set off the air bag even though the car battery is disconnected.
Yes I know; a h#ll of a lot of work and checking but it is straight forward. There are other codes..but the above mentioned are the most common.
1990 Vert
Charcoal Metallic
INFL REST and Seatbelt light (8/11)
 1/3/10 10:00am
eddie20890
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lanoka harbor, NJ - USA

Vette(s):
1990 L-98 white/ red/black leather interior targa top auto 1975 L48 blue/black leather interior t tops auto


Joined: 3/22/2009
Posts: 1363

[QUOTE=UNCLEBILL]This is a common problem on 1990. Check for code(s). Go to terminal under drivers side dash on right side. I like to ground on the driver seat and connect other end to Terminal "K"..2nd row 3rd from right. The Rest. lite will blink code 12 (1long-2 short) 3 times..after this the default codes will start blinking ..3 times for each default(s) and then finish with 3 times for code 12 again. Most likely you will see a code 26 as this is the majority of problems. This represents the air bag sensor on the passenger side. Disconnect the battery ..and now the fun begins. You have to take off the side fender and possibly the inner fender to get at the sensor under the rad. reservoir. There are 2 bolts holding it down(tight and cramp spacingCry). When off; sand the frame area and the underside of the sensor well to remove any corrosion if any and apply dielectric grease to the surfaces. (***this was GM's fix to this problem for 1991Shocked). Reassemble and connect battery. Now comes more fun....to clear code(s) for Rest. lite AND seat belt lite...turn ignition on but not to turn over engine.....connect to K terminal  and ground(seat)..wait for the 3-12 code flashes then start this clear process....unground for 3 sec...ground for 3 sec....unground for 3 sec. and ground for 3 sec....unground for 3 sec. and ground for 3 sec...UNGROUND for 10 sec. and turn key off. It IS IMPORTANT that your timing is EXACT..you only have a +/- 1/2 sec. window of tolerance or you may be doing this proceedure over many times.
The other sensor(drivers side) is under the battery on the frame rail and that is code 25 I believe.
If you do not have a FSM: do not attempt to check with a Digital multi meter as the battery from this can set off the air bag even though the car battery is disconnected.
Yes I know; a h#ll of a lot of work and checking but it is straight forward. There are other codes..but the above mentioned are the most common.
1990 Vert
Charcoal Metallic
[/QUOTE]

sure is a lot of checking. mine stays on too. there are a couple problems with this. 1990 only had a drivers side airbag unless passenger side was a special order. i have 2 scanners and neither show a t/c. PO said it happenned to him and he had the sensor replaced even though gm said there was nothing wrong with it at a cost of about $600 (saw the receipt). maybe the diselectric grease is the answer even in 1990s.Wits End


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the dynamic duo


c3vr life member #97
INFL REST and Seatbelt light (9/11)
 2/12/10 9:32am
UNCLEBILL
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, - Canada

Vette(s):
1990 VERT..CHARCOAL METALLIC


Joined: 3/20/2009
Posts: 3

[QUOTE=eddie20890] [QUOTE=UNCLEBILL]This is a common problem on 1990. Check for code(s). Go to terminal under drivers side dash on right side. I like to ground on the driver seat and connect other end to Terminal "K"..2nd row 3rd from right. The Rest. lite will blink code 12 (1long-2 short) 3 times..after this the default codes will start blinking ..3 times for each default(s) and then finish with 3 times for code 12 again. Most likely you will see a code 26 as this is the majority of problems. This represents the air bag sensor on the passenger side. Disconnect the battery ..and now the fun begins. You have to take off the side fender and possibly the inner fender to get at the sensor under the rad. reservoir. There are 2 bolts holding it down(tight and cramp spacingCry). When off; sand the frame area and the underside of the sensor well to remove any corrosion if any and apply dielectric grease to the surfaces. (***this was GM's fix to this problem for 1991Shocked). Reassemble and connect battery. Now comes more fun....to clear code(s) for Rest. lite AND seat belt lite...turn ignition on but not to turn over engine.....connect to K terminal  and ground(seat)..wait for the 3-12 code flashes then start this clear process....unground for 3 sec...ground for 3 sec....unground for 3 sec. and ground for 3 sec....unground for 3 sec. and ground for 3 sec...UNGROUND for 10 sec. and turn key off. It IS IMPORTANT that your timing is EXACT..you only have a +/- 1/2 sec. window of tolerance or you may be doing this proceedure over many times.
The other sensor(drivers side) is under the battery on the frame rail and that is code 25 I believe.
If you do not have a FSM: do not attempt to check with a Digital multi meter as the battery from this can set off the air bag even though the car battery is disconnected.
Yes I know; a h#ll of a lot of work and checking but it is straight forward. There are other codes..but the above mentioned are the most common.
1990 Vert
Charcoal Metallic
[/QUOTE]

sure is a lot of checking. mine stays on too. there are a couple problems with this. 1990 only had a drivers side airbag unless passenger side was a special order. i have 2 scanners and neither show a t/c. PO said it happenned to him and he had the sensor replaced even though gm said there was nothing wrong with it at a cost of about $600 (saw the receipt). maybe the diselectric grease is the answer even in 1990s.Wits End
[/QUOTE]      
  
Like the old expression.......'NO PAIN---NO GAIN"Wink 
  
 
INFL REST and Seatbelt light (10/11)
 5/2/10 6:41pm
eddie20890
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lanoka harbor, NJ - USA

Vette(s):
1990 L-98 white/ red/black leather interior targa top auto 1975 L48 blue/black leather interior t tops auto


Joined: 3/22/2009
Posts: 1363

well unclebill was sure right on this one--- it is a real pain. last weekend i took the sensor on the drivers side and cleaned the frame and sensor and reinstalled using the diselectric grease. as the book from the body shop showed there was only one i figured i was done. WRONG. lite stayed on and after a little reading of a set of jumper plugs that i bought from ecklers learned how to read the codes in that computer.

sure enough it showed the code for a right side sensor. so much for the book from the body shop. i have been working on the 75 so later this afternoon i did a couple of things to the 90. i thought that maybe the code had to be cleared manually so i printed out unclebills directions for clearing the code. sure wasn't that much fun as it took me about 4 tries and ta-da both lites went out. i was hoping that i would not have to mess with the right side.

had to run to the store so i jumped in the 90 and was waiting for a light to turn green and looked down and lites were back on. Censored. looks like i will be taking the right side off probably next weekend.


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the dynamic duo


c3vr life member #97
Re: INFL REST and Seatbelt light (11/11)
 7/12/15 4:59pm
Cattrax
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Taylor Springs, IL - USA

Vette(s):
1990 White 6spd Stock


Joined: 7/12/2015
Posts: 1

I am bringing back an old post since I am having the same problem.  Only when I ground the K terminal nothing happens except it delays the INFL REST light coming on by a few seconds.  If I don't ground it, the light comes on immediately when the key is switched to on, thus I am sure I have a good ground.  1990, 6 speed, stock.  Replacement radio. 
Thanks in advance for any help. 
Ken
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