Join Date: Dec 2010
Location: Homestead, Florida
The BCM controls locking and unlocking with the remote and the shift lever movement. The electrical relays and circuit board, that the BCM signals are sent to, are in the driver's door switch module. There are only two circuits from the BCM to the driver's door switch module. One for locking and one for unlocking. If the driver's door unlocks, using the remote or shift lever, it indicates that the unlock circuit is good. I would suspect a defect in the driver's door switch module circuit board.
Before attempting any electrical troubleshooting, disconnect the negative battery cable for an hour or so and see if anything changes. You could also check the connectors for the switch module. The connector with the unlock circuit is the larger, 14 pin connector and the wire is white.
A note of caution: When removing the switch assembly from the door panel, remove the screws and then LIFT UP ON THE FRONT OF THE SWITCH PLATE to release it from the retainer. Failure to release the front retainer first can result in a broken retainer and the switch plates are not cheap.