3800Pro Forums banner

1 - 6 of 6 Posts

·
Registered
Joined
·
52 Posts
Discussion Starter #1
Hey all,
On my 98 Regal GS:
This is a tricky one that has me stumped. The other day my keyfob stopped working. Didn't think too much of it other than thought the batteries were dead in it. Then I noticed that my trunk was unlocked/unlatched one time... again I just thought I forgot to close it but I didn't remember opening it. I would have had to use the fob (which was dead) or the key which I didn't use recently but shrugged it off and didn't put much thought into it. Then I noticed my trunk released again... scratched my head a bit on this instance but was late and locked the car up manually because the driver and passenger front door panels are removed because I am in process of installing speakers in the doors and am playing with the configuration so I don't have any power lock buttons on either front doors at the moment. Keep this in mind in case it may have something to do with this. So today once again I noticed my trunk released (no dash trunk open light on) so I decided to troubleshoot a bit. Shut trunk and drove around block, came back, put car in park and checked trunk and it was released. Basically figured out trunk releases every time I shift the car into park and the auto unlock feature is activated. Even if I just shift car into drive then park (locks doors then unlocks when shifting) and still the keyfob won't respond. Checked keyfob battery - tests ok at 3v.

Kinda stumped on this one. any thoughts? I was also playing with the battery terminals and had the car powered down and up a few times during this time when it all started acting up. One thing In haven't tried yet is rebooting the car (unhooking the battery and waiting for a few mins then reconnecting it) so I will try that this afternoon when I get a chance and report back. Maybe something barfed in the computer and needs a reset/power cycle to correct the issue. Also I added a heavy duty power cable going from the battery Positive post to the fuse/relay box and another to the alternator output directly to the battery positive post. This is what I was working on with the battery terminals the other day when I noticed this all starting. I left the stock wiring in place to the alternator and fuse/relay box too, just added a bigger secondary one in preparation for the stereo install. Could that effect it? I haven't tried disconnecting the secondary ones yet. Will try later today.

Also for those people that have aftermarket amps installed, where did you go through the firewall with your amp power wire? I have some pretty thick 2/0 cable to run and was contemplating the best place to go through the firewall as it is pretty thick...

Any insight to anything is appreciated.
Chris
 

·
Registered
Joined
·
52 Posts
Discussion Starter #2
UPDATE: Rebooting the car solved the trunk release issue! Now to see if the fob reprograms...
 

·
Registered
Joined
·
52 Posts
Discussion Starter #3
It started doing it again. Rebooting (unplugging the battery and replugging it in a while later) doesn't help. It's been doing it pretty much since I thought I had it beat. This stumps me. I keep noticing that the trunk is sometimes open when I come back to my car. This concerns me because I park on the street overnight and I have lots of "junk in my trunk"... lol. But for real... I was sitting it the other day, car powered off talking to my friend then pop goes the trunk seemingly random out of nowhere. Sometimes when I shift it into gear, or out of gear poppo... Any clues? It's just so odd, I can't even...
 

·
Registered
Joined
·
74 Posts
That’s one I’ve never seen before. My gut is telling me you have a short somewhere, where the door unlock wires are somehow powering the trunk circuit. Think of any of the places you’ve removed panels, and disturbed wiring. Look for electrical corrosion (green or whitish powdery residue). My money is drivers rocker sill under the carpet. If there’s no shorts or wiring issues the BCM has likely shorted internally. Cheapest way to solve that issue if the only problem you’re experiencing is the trunk, get the BCM wiring schematic and cut the trunk opening circuit. Otherwise the BCM is hundreds of dollars and dealer programming.
 

·
Registered
Joined
·
52 Posts
Discussion Starter #5
If I grabbed another BCM out of another car, you think that will work? What cars would have a compatible BCM? Regal LS work? Century? Would it have to be programmed for the specific car?
 

·
Registered
Joined
·
74 Posts
If I grabbed another BCM out of another car, you think that will work? What cars would have a compatible BCM? Regal LS work? Century? Would it have to be programmed for the specific car?
no a BCM out of another car will not be plug and play. Programming is 100% required. Best option is looking for a wiring fault first. 2nd best is deleting the trunk open feature and just doing it manually if the BCM is the problem. My personal preference would be cutting the wire at the BCM rather than at the trunk if that’s what you need to do.
 
1 - 6 of 6 Posts
Top