Buick Repair Questions? Ask a Mechanic for Answers ASAP
Hello, my name is Bobby. Thank you for the question. Can you tell me if all of these stopped working at the exact same time?
I just saw the rest of your question. I see that you already answered that. Also, can you tell me if you have a voltage meter to run some tests.
Thanks. Start by checking for power at the PDM fuse. This is in the box behind the glove box. If it is fine and if it has power then check the wiring junction connector under the passenger side of the rear seat. These circuits go through there and it is common for this connection to break or become contaminated. If you do not find anything with these checks please let me know and we can continue.
Sorry for the delay in getting back with you. I was unavailable earlier today. I should be on more today. You may have a break in the wiring to the rear doors, or it actually sounds like you may have an ignition switch issue. Do you know how to access the ignition switch?
With the key off you should have battery voltage at only two of the wires. With the key in run all but the yellow should have battery voltage. The yellow wire should only have voltage when the key is in the crank position. If any of these don't occur then replace the switch.
Under each kick panel under the dash there is a ground connection. Make sure both are clean and tight. Then if those are good remove and test the RAP circuit breaker in the fuse box. If that is fine there is a bad connection from that circuit breaker.
Does the fuel door release work?
Besides a possible break or open in the wiring or an internal fuse box issue the only other thing that links all of these systems together is the body control module.