Power Door Locks

The BCM  controls the door locks by sending messages over the Medium Speed Controller Area Network (MS-CAN) to the DDM  and the PDM  . The DDM  and the PDM  each relay the messages over a dedicated LIN  to the Driver Rear Door Module (DRDM) and the Passenger Rear Door Module (PRDM) respectively. Each door module supplies power and ground to its corresponding door lock actuator (integrated into the door latch). The modules reverse the polarity to switch between the lock and unlock functions.

The BCM  sends voltage signals to the door lock control switch. When the door lock control switch is pressed, the voltage signal is routed to ground, indicating a request to lock/unlock the doors.

Each door module also monitors the door lock/unlock status by sending a voltage signal to its corresponding lock/unlock feedback switch inside each door latch. The switch is closed when the door is unlocked and open when locked. The rear door modules send the information to the corresponding front door modules. The front door modules then transmit the door lock/unlock status to the BCM  . The BCM  uses the input from the lock/unlock feedback to determine if the indicator should be illuminated or off. The BCM  controls the voltage to the door lock indicator.

If all 4 doors are locked and the lilftgate/luggage compartment lid is closed, the indicator is illuminated. If any door is unlocked or the lilftgate/luggage compartment lid is open, the indicator is off.

When locking the driver door using the door key cylinder, all the doors lock. When unlocking the driver door using the door key cylinder, only the driver door is unlocked.

In the event of a failure of the power door locks, the doors can be individually locked through the manual door lock. The manual door lock is located on the rear edge of the door just above the door latch opening. For the doors on the left side of the vehicle, insert a key and turn clockwise to lock. For the doors on the right side of the vehicle, insert a key and turn counterclockwise to lock.

Based upon input from the door lock control switches, the lock/unlock feedback input, the keyless entry keypad, the passive entry system and the RKE  transmitter, the BCM  unlocks the driver door, unlocks all the doors or locks all the doors.