Door lock problem
Thread Starter
Racer
Joined: Feb 2004
Posts: 420
Likes: 23
From: Newton, Wisconsin
Door lock problem
After playing with my DIC the other day, setting the options the way I wanted them, I noticed that the drivers door would not lock with the key FOB or by pressing the lock/unlock switch. It makes a clicking sound like it locked and the lights flash etc, but the door will open and the alarm goes off. The door will lock with the key and manaully by pushing the lock and the FOB will unlock the door. Passenger door lock works OK. Any suggestions on what to look for or a fix?
Advanced
Joined: May 2005
Posts: 96
Likes: 0
Originally Posted by Hrdtop00
I had a very similar problem in my car. It turned out to be the EDCM in the drivers door. I purchased one from Gene here on the forum.
Night Owl for life
Joined: Nov 2003
Posts: 24,706
Likes: 4,549
From: Bugs Bunny should'a made a left turn here
Originally Posted by Hrdtop00
I had a very similar problem in my car. It turned out to be the EDCM in the drivers door. I purchased one from Gene here on the forum.
a "new" module from a parts car solved the same problem for me.
i got it for $50 shipped.
Race Director
Joined: Jul 2004
Posts: 16,795
Likes: 62
From: Lake Havasu City, AZ
I belive it is called a door control module ( DCM). One is for the drivers door a different one for the passenger door.
There are at least 4 possible problems that can cause your issue.
1.a short in the wiring or loose connections to the module
2.a bad relay in the module ( generally this means the fob does not unlock but the door button does) digi-key sells the relays for under $2 and a radio repair shop can remove it and resolder it
3. the circuit board is shot need a replacement DCM ( $50 used or approx $400 new from the stealership
4. the problem is not the DCM but the lock actuator.
good luck tracking it down
There are at least 4 possible problems that can cause your issue.
1.a short in the wiring or loose connections to the module
2.a bad relay in the module ( generally this means the fob does not unlock but the door button does) digi-key sells the relays for under $2 and a radio repair shop can remove it and resolder it
3. the circuit board is shot need a replacement DCM ( $50 used or approx $400 new from the stealership
4. the problem is not the DCM but the lock actuator.
good luck tracking it down
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6th Gear
Joined: Apr 2005
Posts: 6
Likes: 0
Chasing Gremlins
I have been chasing gremlins myself the last couple of days. I have isolated the problem as a bad ground. (I have full system outage of LDCM, no comm...) Is the code the DIC pulls. I don't think that is what your problem sounds like. First pull the codes by holding down option and pressing fuel 4 times. Write down any codes for the LDCM of RDCM. the codes change every year but they are posted various places around the internet. If that didn't tel me anything useful I would hot wire directly to to lock actuator bypassing the module. If that doesn't trigger your latch you need a new latch. Going throught the wiring diagram checking power and grounds is the next process. As other members have stated it could just be your DCM which is about $180 for a new one from gm-car-parts.com
Hope It helps.
Hope It helps.