Air bag light

[Rich S]

I just bought a used 97 Tahoe. Had it for a week and now sometimes after the truck has been running for a while, the air bag light flashes. When it flashes on, I have no throttle control. It flashes in .5 sec intervals. This will last for about 10 seconds then shut off completely. After it is off for good, the transmission shifts extremely hard. It only does this after the air bag light gets done flashing and the hard shifting lasts until I shut off the vehicle. Can they provide a code even though the light is not on at the time they check it?

[redvett]

If you havent clean all grounds including both cables on battery.

[Rich S]

Where do I find the grounds other than the battery cables?

[Rich S]

Ok, I cleaned off the grounds and found some corrosion on the battery terminal. Drove the truck all day. Worked great until just now. The heater fan stopped working. I played with the switch but could get nothing. About 20 minutes later, the airbag light came on and flashed again. I payed close attention this time. The lights dimmed down and the engine surged as it flashed. It flashed for 20 seconds then stopped. The truck imediately started shifting hard. I pulled over and turned it off and back on again. The fan now worked and the truck shifted fine. Is there a computer in there somewhere that is shorting out or something? Please help, I will take any suggestion. I just don't want to go to the dealer blind and have them charge me thousands of dollars if it is not needed or it is something I can fix myself.

[redvett]

I am inclined to think the IGN switch is going bad. How many miles?

[Rich S]

86,000 Is this a part I can get at autozone and change myself or should I have a dealer do it?