Thread: 05 Grand Prix Door Lock Issue

Originally Posted by acarboneau10

I have not had a power loss on the vehicle, but I will go out and mess with the DIC during my lunch break and switch the features to see if that resets or fixes anything. Next step would be a battery test?

If this fixes your problem and it stays fixed, chalk it up to gremlins or evil spirits. If this fixes your problem but it doesn't stay fixed, I believe you can narrow down the problem to the BCM. I've been installing a head unit and have had mine unplugged....the memory isn't in the DIC. It's gotta be in the BCM. I'll try to look up the information from Service Information at work when I get there and see if there's any other troubleshooting tips I can get for you.

Well I tried resetting everything on the DIC and it still has the same issue. I am going to get my battery checked out at lunch and then if that does not fix it, I will start the troubleshooting of the BCM.

Where is a good source to find wiring info on the Grand Prix... I printed out a spreadsheet from bulldogsecurity.com that was mentioned in an earlier post.

Originally Posted by apierce1289

Bulldog security is the best place to get information about the wiring the one you print it out for your car should tell you the color and the location of the wires. And I'm assuming you've never done this before so you're going to need to go to NAPA Auto Parts or you know any other auto parts store and ask them for an automotive test light it looks like a screwdriver type of thing with a wire connected to it and a needle tip on the other end and they run about 10 bucks at most.

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Had the battery checked out and it is good. However, the guy who ran the test said my voltage regulator on my alternator could be going bad. I am going to have that checked out, but not sure if that would have something to do with the door lock issue. On another note, my washer fluid sensor might be bad because I'm getting a low washer fluid warning but it's completely full!

I don't know about ur electrical issue but had the same low washer fluid issue. I pulled out the sensor to inspect it and it looked fine but when I drained the reservoir there was small dirt particles so I just put the sensor back in, refilled and so far no low washer fluid warning.
BTW I gave a 04 GTP COMP G
Very easy to do, on my car it's located right behind the passenger fog light.