2004 GTP Won't Start

**sjw515** · 07-22-2013

Hey guys I have a 2004 Pontiac Grand Prix GTP with 75,000 miles. The other day when I tried to start the car I got no response, no engine turning over at all so I assumed the battery was dead. Also I noticed the wiper blades were pointing up which I found odd since I had not used them the night before. The first thing I tried was to jump the car which did not work. So I got the battery tested at Autozone and I was told it was dead. I replaced the battery with a brand new one and the car still will not start. When I turn the key you can hear the fuel pump engage but no engine turning over. The keyless entry will not work, the power windows and locks do not work, and none of the lights inside the car and the radio dosn't work either. But you can hear a faint static coming out of the speakers even when the key is not in the ignition. However the headlights do work. So the battery is working and was part of the problem.. But now I am unsure what the actual problem is.. Possibly an electrical problem or my ignition swictch? Has anyone else encountered a similar problem? I have disconnected the battery so it does not get drained while the car is sitting. Any help or advice would be greatly appreciated. Thanks!

**Bills1997GTP** · 07-22-2013

Sound like an ignition switch but I could be wrong

**acidcrashdburnd** · 07-22-2013

Time to start checking fuses. Look at the one related to IGN or PCM under the hood and pass side dash.

**dmw319** · 07-22-2013

Hey guys, my name is Dave and I am sjw515's brother. I have been trying to help him diagnose/fix the car. I checked all the fuses that I can test (where you can see if they are blown) but some of the larger ones that are square shaped you can't really tell if they are bad or not. Anyone know how to test those?

It does seem like it is something fail-safe related that is not allowing the car to start like a fuse, switch, or something like that. When you turn the key on, you hear the fuel pump engage as he said. Then, when you try to start the car, nothing happens. The starter doesn't even click or anything.

**acidcrashdburnd** · 07-22-2013

Originally Posted by dmw319

Hey guys, my name is Dave and I am sjw515's brother. I have been trying to help him diagnose/fix the car. I checked all the fuses that I can test (where you can see if they are blown) but some of the larger ones that are square shaped you can't really tell if they are bad or not. Anyone know how to test those?

It does seem like it is something fail-safe related that is not allowing the car to start like a fuse, switch, or something like that. When you turn the key on, you hear the fuel pump engage as he said. Then, when you try to start the car, nothing happens. The starter doesn't even click or anything.

When I blew the PCM fuse it would still click. Nothing about security on the DIC? it might just be a switch they do go bad in these cars.have you tried to jump the started to check if will even crank?

**dmw319** · 07-22-2013

Originally Posted by acidcrashdburnd

When I blew the PCM fuse it would still click. Nothing about security on the DIC? it might just be a switch they do go bad in these cars.have you tried to jump the started to check if will even crank?

what is the DIC?

I have not tried to jump the starter

**Bills1997GTP** · 07-22-2013

It's a screen on the dash that tells you the miles on your car

**dmw319** · 07-22-2013

Originally Posted by Bills1997GTP

It's a screen on the dash that tells you the miles on your car

If I am remembering correctly, it is not lighting up as well as all the interior lights. I think the only light I could see was the check engine light. nothing else was responsive ( power dowers and locks, etc). headlights did work though...

**acidcrashdburnd** · 07-22-2013

I wonder if you BCM (body control module) has died. That is located on the drives side of the dash behind that panel covered by the CLOSED door. Also check the grounds at the transmission bell housing almost all of them are there.

it controls almost everything in the cabin.

**acidcrashdburnd** · 07-22-2013

I would check the wires on the starter, check the wire on the alternator, check the grounds, check the power cable going to the fuse box under the hood..

**dmw319** · 07-22-2013

Originally Posted by acidcrashdburnd

I wonder if you BCM (body control module) has died. That is located on the drives side of the dash behind that panel covered by the CLOSED door. Also check the grounds at the transmission bell housing almost all of them are there.

it controls almost everything in the cabin.

is there a way to test it or narrow it down to that? otherwise we are just pulling it out and buying a new one? sounds expensive if its not the culprit.

Originally Posted by acidcrashdburnd

I would check the wires on the starter, check the wire on the alternator, check the grounds, check the power cable going to the fuse box under the hood..

power cable to fusebox is good. can check the other wires/grounds also but it just feels like we would be taking a stab in the dark. the car is parked in an apartment complex and there aren't a lot of options for tools, etc. I was hoping to narrow down the issue to something given the issues we are having but i guess its never that easy

**rperry435** · 07-22-2013

Ouch. Bad BCM.

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**dmw319** · 07-23-2013

So there is no way to test to verify that it is actually the BCM is there? Also, where do you purchase one if we were to replace it?

Also, jumping the starter would only verify that the ignition switch is bad, correct?

**acidcrashdburnd** · 07-23-2013

Morad Parts Company - 3800 Motors, Transaxles, & Stock Parts

You will probably need a tow to a stealership to reprogram it, unless you know someone with a GM Tech2 scanner. Give ed a call he will set you up.
And it would give you an idea if the switch was bad, I don't actually think the car would start but it should at least crank.

**rperry435** · 07-23-2013

Highly doubt the switch is bad. It's not like a switch from a 97-03. 04+ use a low amperage style switch. BCM must be programmed with a tech2. They CANNOT be used as they are locked after a few ignition cycles. Symptoms of a bad bcm are no Interior lights,security not enabling starter, locking issues, radio not powering on or locked, no communication with the bcm. Check your power and grounds at the unit other than that sounds text book bad bcm

Jumping your starter will prove nothing other than the starter motor itself is fine. The car will still not run

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**dmw319** · 07-24-2013

Thanks yall. It looks like the BCM is the most likely culprit at this time. (50-65 dollars aint bad!) We just need to find out how much a reprogramming costs at the dealership.

**rperry435** · 07-24-2013

There's no way in hell that a new bcm (body control module) is $60. You cannot put a used one in. PCM (powertrain) yes but not a BCM.

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**sjw515** · 07-24-2013

Originally Posted by rperry435

There's no way in hell that a new bcm (body control module) is $60. You cannot put a used one in. PCM (powertrain) yes but not a BCM.

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He was looking at ones from ebay.. So they quite possible would be used ones. But I work for Carquest and can get a new BCM for $110. Thanks for all the help and ill keep you updated.