[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 spacing
). 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 1991
). 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
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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.
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Like the old expression.......'NO PAIN---NO GAIN"