Power Door Locks (With RPO Code AXC/AXE)

POWER DOOR LOCKS DESCRIPTION AND OPERATION (WITH RPO CODE AXC/AXE)

DOOR LOCK SYSTEM COMPONENTS
The power door lock system consists of the following components:
- The driver door module
- The passenger door module
- Door lock relay-Located in the instrument panel (I/P) fuse block and controls the locking of the rear doors.
- Door unlock relay-Located in the I/P fuse block and controls the unlocking of the rear doors
- The body control module
- The IP BEC
- The reversible door lock actuators in each of the doors

DOOR LOCK SYSTEM CONTROLS
The power door lock system can be controlled by any of the following:
- A power door lock or unlock switch command
- A keyless entry command
- An automatic door lock function
- Door lock cylinder switch command
- Lockout Prevention

DRIVER AND PASSENGER LOCK SYSTEM OPERATION
The front power door lock switches are integral components of the driver door module and passenger door module. The switches are 2 position normally open rocker switches. When placed in either the lock or unlock positions, the switches provide a direct input to the driver door module or passenger door module. The driver door module or passenger door module monitors these inputs and sends a LAN message indicating a change in the switches respective position. Modules which activate the power door lock motors receive the LAN message and activate the motor in the appropriate direction to lock or unlock the vehicle's doors. The body control module (BCM) upon receipt of a lock or unlock signal will control the rear door lock or unlock relays and also send a LAN message to the driver door module and passenger door module to perform the appropriate function.

The modules which activate the power lock motors are:
- The driver door module (driver door lock actuator)
- The passenger door module (passenger front door lock actuator)
- The BCM (both rear door lock actuators)

The driver door module and passenger door module are directly connected to the respective door lock actuator through the door lock motor lock and unlock circuits. Once a door lock or unlock request has been received, the module will supply battery voltage to one side of the actuator and ground the other causing the doors to lock or unlock.

The rear passenger doors are controlled by the BCM through the rear door lock/unlock relay which is incorporated onto the printed circuit board in the LH BEC. The BCM controls the unlock relay by providing ground to energize the coil and controls the lock relay by providing battery voltage to energize the relay coil. The energized the relay and allows voltage to be applied to either the door lock motor lock or unlock circuits. Since the other side of the door lock actuator is connected to the normally closed contacts of the opposing relay to ground, the doors lock or unlock.

PROGRAMMABLE AUTOMATIC DOOR LOCKS
The automatic door lock feature can be programmed to control the door lock system. The automatic door lock feature is factory programmed to have all doors lock and unlock.

When the automatic door lock feature is programmed to control the door lock system, the driver door switch, passenger door switch and body control module (BCM) will lock the vehicle doors if the following inputs are true:
- Ignition 1 input is active
- All door jamb switch inputs are inactive
- Transmission is shifted out of PARK

This automatic door lock function will only occur once per ignition cycle unless, a door jamb switch input changes state to active and back to inactive. Then the driver door module, passenger door module and BCM will lock all doors again.

Once the automatic door lock feature has locked the doors, the BCM will then unlock all the doors when the transmission is shifted into PARK.

LOCKOUT PREVENTION
This feature prevents the locking of the driver door if the ignition key is left in the ignition lock cylinder. If a lock function occurs from any door lock switch and the body control module (BCM) senses an active state on either the left front door latch signal, secondary door latch switch signal and/or the liftgate ajar switch signal circuits and the key in ignition switch signal circuit is in the YES state, the BCM, driver door module and passenger door module will lock the doors and then the driver door module will unlock the driver door.