I am in need of the new diagnostic codes for the 1990 vet. where can they be found, since GM no longer has them. The ones in the old service manual wont work with DERM.

I believe a Haynes manual will have these, or perhaps Alldata.com.

Thanks I will check both of these and let you know. The GM dealership was not able find anything, they were needing the new codes because they told me that at some time or another, the airbag had been replaced, and needed the new codes to make the airbag light go out on the dash. the old codes would not work with new airbag. I will look for a new manual this week. Again Thank You......

If your airbag light is on, there is no code that is going to clear it, the system has detected that there is a problem, I would try another dealer. They need to "reset the system and/or fix the problem. you might end up needing a new air bag. as the one there now is not compatible. But if you have engine codes, I have a manual here, if you post the codes I can look them up.