I am helping my dad troubleshoot a few issues with his 96 bonneville, but some of this has left me stumped. Unfortunately (forunately?....
) I am a german car guy, so the way this car is built confuses me sometimes.
At present, he has a mal-functioning ECC. It looks like it is the air mix motor. He has almost no control over whether he has heat or not. The climate control does nothing on it'* own, but if you change the temperature, then bang on the dash a couple times (his solution, not mine), it will usually end up set correctly. I've done some searching on here, and that is what I believe to be the problem. For a short while his ECC display was flashing indicating a problem, but he did not know anybody who could read the code, and it is no longer flashing. Is it too late to retrieve the code? Are we somewhat correct in our assesment of the problem?
Does the passenger side airbag have to be removed to fix this, and if so, is there a procedure somewhere for the removal of it?
Next up is the one that has us stumped. After some banging on the dash, his interior convenience items are acting up. If this was a german car I would say it'* the convenience module, and that it is related to his heat problem, but I am not sure if this has one, and if so whether it is combined with the ECC?
For example, he will start his car, and have no seatbelt warning light/chime. However, upon shutting his car off, when he retracts his seat belt, the chime will go off, and the interior lights will come on. Before he has opened his door.
This only happens sometimes, and occasionally it will manifest itself in other ways, randomly chiming, the interior lights act almost as if posessed, and he is concerned that they will simply stay on one day, and drain his battery.
Is there a convenience module of some sort, and if so, is it by chance located under the passenger side of the dash somewhere?
Is it primarily constructed of relays and other devices that may have been damaged by the repeated banging on the dash?
Next up is the burned-out radio bulb. I know all about fixing it, but for removal of the radio, can we just pull the trim piece surrounding it straight off, or are we missing some screws or other pieces that must be removed first?
Thanks in advance for any advice you guys can give!