BCM, or short, or something in the middle

Tiny
GRINDER_1
  • MEMBER
  • 2001 CHEVROLET MALIBU
  • 6 CYL
  • AUTOMATIC
  • 100,000 MILES
Someone tried to break into car by prying out door handle. Pried it so far that I could get to the 2 bolts to pull the handle assembly from outside of the vehicle. We tried to bend them back, but the damage was severe enough to not allow assembly to sit flush. Pick and pull door sale weekend. So $25.00 for a whole new door seemed the easy route. Replacement was not power equipped, so we switched the insides out, and upon completion the trouble began.

First thing we noticed. Neither driver nor passenger lock buttons would lock the doors, but both would unlock all doors. I was frustrated so went home. At least her car was secure. Later I receive a message about the vehicle having different personalization options with the door locks. She doesn't inform me of the following:The car locks all the doors when she puts it in reverse. So she tries changing which mode the car was in.
Only after she does this does she fill me in. And at the same time she tells me that after trying that, the car is possessed. Chiming all the time, and locks being inconsistent. Etc.

I go pull the panel to check all the lock and handle rods, and find that the lock rod had come out of its lower position during the swap. I fix this, and put things back together. I then do extensive trial. And error tests with these results.

* When driver or passenger doors are open. Neither side will lock the doors. Driver side wont unlock. Passenger side will unlock.

* With both doors closed, passenger lock button will lock and unlock all doors. Driver side will unlock, but not lock. I then discover that if you do an even (down, down ) motion with the driver side lock button that it will lock all doors. Not too long after I discover this it seems to stop working. It also seems that it does work correctly with the doors closed at times. The vehicle acts like it is in the third mode. All doors lock when vehicle is removed from park, except it does not complete the mode because no doors unlock when the vehicle returns to park and the key is moved to the lock position.

Along with this there is a one, three, four chime pattern that repeats when vehicle is in park. It seemed to quit when vehicle is removed from park.

My first thought is we disturbed something in the door swap, that created, or exposed a short. At the same time, the passenger side seems to function fine always with the doors closed. This steers me away from anything we did. In reading different similar problems I saw someone with a similar issue get asked if the passenger side worked fine. Referencing a possible BCM issue. This persons did not, so there was no more information for me.

Does any of this give anyone enough info to point me to a probable cause, or at least to rule anything out?

If we caused a short during the swap, can I disconnect the passenger wire harness ending the short, and driver side should then work correctly?

What is up with the chimes?

Thanks in advance
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Monday, November 11th, 2019 AT 8:16 AM

5 Replies

Tiny
SCGRANTURISMO
  • EXPERT
Hello,

Is your vehicle's Malfunction Indicator Lamp[MIL] or "check engine" light illuminated? For reference, I have included a wiring diagram of your vehicle's Power Locks circuits in the diagrams down below. Please get back to us with the answer to the MIL question and we can go from there.

Thanks,
Alex
2CarPros
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Monday, November 11th, 2019 AT 9:16 PM
Tiny
GRINDER_1
  • MEMBER
The check engine does come on periodically, then goes off. This us a separate problem related to misfire in cylinder 3. It is currently not on, or throwing any codes.
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Tuesday, November 12th, 2019 AT 2:45 PM
Tiny
SCGRANTURISMO
  • EXPERT
Hello again,

Okay, in the diagrams down below I have included the diagnostic troubleshooting guides for the driver's side door power locks inoperative, how to find a short to power and short to ground in an automotive electrical circuit, how to find an intermittent and poor electrical connectors in an automotive electrical circuit, and how to find unwanted resistance in an automotive electrical circuit via voltage drop method. You will need to use a Digital Multi-meter [DMM] to do this, so here is a link below explaining how to use, if needed:

https://www.2carpros.com/articles/how-to-use-a-voltmeter

Please go through these guides and get back to us with what you are able to find out.

Thanks,
Alex
2CarPros
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Tuesday, November 12th, 2019 AT 3:13 PM
Tiny
GRINDER_1
  • MEMBER
Thank you. Going to take me a little time to post results to you.
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Friday, November 15th, 2019 AT 2:32 PM
Tiny
KEN
  • ADMIN
Please let us know what you find. We are interested to see what it is.
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Monday, November 18th, 2019 AT 11:36 AM

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