Help! Doors Unlock Themselves

[silverad03]

Hi all,

 

I have recently discovered a very intermittent problem with my automatic door locks after replacing my original factory battery that died (03 Silverado LT). The doors unlock themselves ever so often when I'm driving down the road, but so far this has only occurred when a large bump is encountered. So far it has only occurred when crossing a set of railroad tracks or sometimes the track for the gate at the front of my apartments (which sits up out of the pavement a little bit and causes a suspension jounce). The problem is very intermittent, as it has only occurred a couple different times in the past couple weeks. However, on one of those drives the door locks unlocked 3 or 4 different times as I travelled around. The door locks do not repeatedly cycle or continue to try to unlock - it is just a one time cycle and they are unlocked and that's it until the next bump that hits just right.

 

I don't know if the original factory battery death has anything to do with the issue or not, but I never noticed the problem until after the battery was replaced. When the battery died I had to get a jump start once from a portable jump start power pack to get home from work. Once I got home the battery was replaced and shortly thereafter the doors began to unlock on their own

 

My first thought is that it's probably just a ground issue at the battery - but this would lead me to believe that other odd things would be happening too - but I have not observed any other problems. Another option I thought of is that I didn't jump start it right (pos to pos and neg to neg) and something got messed up - but again I would think there would be damage other than just an intermittent door unlock.

 

What do you guys think the problem might be?

[rdessewffy]

I dont know but my trucks doors locked by itself 3 times so far. I leave the keys in the ignition in my driveway all the time and thats when it was happening- lucky I either had the windows down or I was able to get my spares in the house and didnt get stuck any place.

[hulbert]

If you have a bumper-to-bumper warranty that should cover the problem free of charge.

[99silverado1500]

latitude make ur sig smaller jesus. thats a funny problem.

[j.roffel]

He needs a huge sig thats a huge truck! I'm jealous. As for the locks I guess that something could have happened to the ecu with a bad jump.... Did you go neg to neg or neg to ground? Couldnt find any TSB's replicating this issue, I'd say take it to the dealer but you just know that they wont be able to replicate the problem, and won't do anything unless they see it...

[silverad03]

When I jumped it, I used a jump start power pack - one of those portable little boxes that has a pos and neg cable on it and you just hook it up, no other car is needed. I connected the POS to POS and the NEG to NEG rather than connecting the NEG to GROUND (frame, etc.).

 

I don't have an extended warranty so that's out... and like was said, it is so intermittent a dealer would prob never duplicate the issue.

 

Also, last year I had an electronics store install a remote start system but they could never get it to work right for more than a couple starts. The system would get messed up and start locking/unlocking the doors and set the alarm off at random when the truck was running. I had them take the system out after a half dozen trips to the store for repairs but there could be some residual electrical hacks they did not fix properly that are just now showing up... dunno. I would take it back to the store but they are halfway across the country now that I have moved.

 

I'm hoping there is someone here who has enough knowledge of the systems to tell me where to start... are the locks controlled by the BCM (should I start here)? Should I be looking for a rusty ground connection in the door or something? For those of you who are knowledgeable about remote starts, where are some places I should look where the remote start installer might have stripped some wires during the installation process?