Question about 2002 Chevrolet Venture Passanger

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My power door locks lock but not unlock the doors

My power door locks work from the door buttons to lock but not unlock the doors. The unlock works when the key is shut off. When I pull the door lock fuse and hit the button I can hear the bcm actuate to lock with a click but not to lock. This started when my wife was trying to get in before and while I was using the unlock button. The buttons check out okay. Do I need to replace the bcm or is there a relay? Or something else?

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  • riclark600 Jul 30, 2009

    Wires are all fine. It's a 2004, not a 2002 by the way.

  • riclark600 Jul 31, 2009

    Mine will lock, but no longer unlock, the doors by the button. They unlock automatically when you put the car in park. I think the BCM is bad but am not sure and don't want to spend the money to change it if that isn't the problem. The problem started when my wife was holding the outside door handle out while I was trying to unlock them. Has not worked from the button since.

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First thing to check is the wireharness under the passengers floor mat,you wiil probably find a mass of corrosion and bad connections,been there done that!

Posted on Jul 29, 2009

  • danny herget
    danny herget Jul 30, 2009

    i'm not familiar with the 04 but iot should be close to the same.my 2002 would only unlock all doors when it was in park ,but i don't no if this is normal.check the operators manual.

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What causes a malfunction in power locks?


The power door locks are controlled by the BCM -body control module ! The door lock switch is an input to the BCM .
The BCM, upon receipt of a door lock switch lock or unlock signal, will switch the appropriate door lock actuator control circuits to battery positive voltage. The opposing side of the door lock actuators are connected to ground internally within the BCM through the other door lock actuator control circuit and the doors will lock or unlock appropriately.
First thing to do would be check power an ground circuits at the BCM ! Do you have any other systems not working -power windows etc...
The DR/LCK fuse supplies battery positive voltage to the I/P fuse block for the door lock system. The body control module (BCM) supplies and monitors a reference voltage to the door lock switch through the door lock switch lock/unlock signal circuit. The door lock switch also receives a constant ground source. If a door lock switch is placed in the lock position or unlock position, the reference voltage is taken directly to ground and the BCM detects the voltage drop on the signal circuit.
Should have BCM checked for stored DTC'S - diagnostic trouble codes !
Ignition ON, observe the scan tool Driver Door Lock Sw, Psgr Door Lock Sw, Driver Door Unlock Sw and Psgr Door Unlock Sw parameters while using the driver and passenger door lock switches. The parameters should change between Active and Inactive.
?‡'
If the values does not change between the commanded states, refer to Door Lock Switch Malfunction.

Command the driver door and passenger door lock actuators to LOCK and UNLOCK with the scan tool, the doors should LOCK and UNLOCK when changing between commanded states.
?‡'
If a door lock actuator does not perform the LOCK and UNLOCK functions, refer to Door Lock Malfunction


DTC B3130 00: All Door Unlock Circuit

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