Everything you've said just tells me its the ignition switch because every thing you've said is supplied power by the ignition switch. The only connection related to the above accessories you've listed is the ignition switch. None of these accessories all share the same circuits or grounds.
The only issue I have is that the door locks not working because they are constantly supplied power and ground (with or without the key on) and do not go through the ignition switch.
Unless, your talking about the automatic locking feature when you place the shifter in drive or when accelerating the door locks will automatically lock all the doors or automatically unlock the doors when you place the shifter in park or remove the ignition key from the ignition cylinder. Is this the case with your Grand Am?
Wednesday, September 18th, 2013 AT 7:59 PM