To check your codes, find the OBDS connector under the dash.
It looks like this:
|_|_|_|_|_|_|
|_|_|_|_|_|_|
Get a pad of paper and a pen.
Turn the key off. Turn off your blower, stereo, etc....
Put the jumper into these two pins:
|_|_|_|_|x|x|
|_|_|_|_|_|_|
Turn the key on, don't start the engine.
Watch the SES light. It will flash numbers (always in pairs).
It will generally start with a code "12", which is one flash, pause, then two flashes, and another pause.
Write down the flash pairs. It can be helpful to have a helper do the writing while you just watch the light and call out "One, Two, One, Two, Three, One, Four, One, One, Two"
When the light cycles back to "12" is generally marks the end of the stored codes, but I always let it run through a couple of times before turning the key off.
Ignore the "12" code, post up the rest of the pairs and someone here can look them up for you, so in my example, the codes you'd be asking about would be 31 and 41.
ABS is similar but the first and last codes may not be 12 (one-two).
|_|_|_|_|_|x|
|_|x|_|_|_|_|
A and H... those are the pins to pull the ABS codes.
Watch the ABS light instead of the SES light, read the codes the same way.
I may have give you the wrong ones then. I was going off the GM OBD1 Code list set of by the CEL.
