Recent content by JAZAuto

  1. J

    04 Grand Am No Start, PCM, BCM?

    Regarding the 04 Grand Am, once the lock cylinder/Passlock module was replaced (it's one unit), the BCM had to be reprogrammed by the dealer with a Tech 2 scanner, (which I believe also connected to a security database through the internet). My Auto X-ray reads just fine now when I check the...
  2. J

    04 Grand Am No Start, PCM, BCM?

    Thanks for the comments above. Yes, the 04 Grand Am on this thread was fixed by re-keying with a new cylinder assembly and then reprgramming the BCM. Is this a correct statement that the key cylinder/Passlock module is a three terminal device that communicates with the BCM to basically "boot...
  3. J

    04 Grand Am No Start, PCM, BCM?

    You're right Gus, it was the lock cylinder that was actually replaced. I don't have the full paperwork from the GM dealership that ended up doing the job. I will try to get it for my own education. Thanks again for the input. JAZ
  4. J

    04 Grand Am No Start, PCM, BCM?

    FINAL RESULT: Car fixed by dealer. Installed new ignition switch (don't think it really was bad but OK) and reflashed the BCM firmware. Cost:$350. Thanks Nick and Gus for the input on this. Perhaps intermittent contacts on the switch caused the BCM computer go crazy - who knows. But the...
  5. J

    04 Grand Am No Start, PCM, BCM?

    Thanks Nick and Jim for the comments and the diagrams! On the Theft Deterrent schematic there is a rectangle that says "DLC Schematic" (I think) and it ties together PCM serial data, Theft Module, and the Instrument Panel Cluster. This seems to tie all my symptoms together so far. Do you...
  6. J

    04 Grand Am No Start, PCM, BCM?

    Well, I was trying to avoid the $100/ hr dealer that's why I'm tinkering with it in my "spare" time. I want to donate to this site but it sounds like the dealer is going to get $$$. Here's a recap: 04 Grand Am - 83K miles -NO CRANK The car was driven to work with no prior problems and after...
  7. J

    04 Grand Am No Start, PCM, BCM?

    Where is fuse "G" ? I know of side dash left, side dash right, and the underhood relay/fuse box. Is there another bank somewhere?
  8. J

    04 Grand Am No Start, PCM, BCM?

    UPDATE: Well, the neutral switch check didn't affect anything during start attempts. No indication of a "security" light at any time except during the bulb check (all idiot lights illuminate then) Also I checked at the diagnostic connector for grounds and (+) voltage where they should be...
  9. J

    04 Grand Am No Start, PCM, BCM?

    Thanks guys for the comments so far. The shift switch is something I haven't considered. I will try shifting around to neutral to see if that changes anything. I haven't noticed any "theft" lights coming on but let me be me more observant during a crank attempt. Battery voltage measures 12.6...
  10. J

    04 Grand Am No Start, PCM, BCM?

    04 Grand Am (83K) with 3.1L will not start. I know from troubleshooting that the PCM computer is not grounding the start relay. I also know that the BCM must not be working because the keyless entry fob quit working at the same time. A scanner check shows that the PCM is not responding to the...
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