Power Door Locks Description and Operation AXA

The power door lock system consists of the following components:

The power door lock system can be controlled by any of the following:

When a door lock switch is activated in the lock or unlock position the body control module (BCM) will receive a voltage signal on either the door lock switch lock or unlock signal circuits.

The BCM, upon receipt of a lock switch lock or unlock signal, will switch the appropriate lock relay control circuit(s) to battery positive voltage. This will energize the appropriate relay(s). The relay will supply voltage to the door lock actuator lock or unlock control circuits. Since the opposit side of the lock actuator is connected to ground through the other lock actuator control circuit and the normally closed contacts of the lock or unlock relay, the doors and liftgate will then lock or unlock as commanded.

Three relays are used to operate the lock. Driver door unlock, passenger door unlock and all door lock. The driver door lock actuator is isolated so it can be unlocked by itself using the keyless entry transmitter.

This BCM-controlled feature can be personalized to driver preference.

The BCM will automatically lock the vehicle doors if the following conditions exist:

The BCM will then unlock the doors when vehicle is shifted back into PARK.

With any door open and a door lock switch is activated in the lock position, the body control module (BCM) will give three audible chimes. When the door is closed, the BCM will cycle the internal door lock relay to lock the doors after approximately five seconds. This feature can be overridden by activating the door lock switch a second time and the doors will lock even with a door open.

The body control module (BCM) will lock all doors and unlock the driver door with a door lock switch lock activation if a vehicle door is open and the ignition key is fully inserted in the ignition. The lockout prevention feature can be overridden if a lock command is received from the keyless entry system.

The body control module (BCM) will unlock all doors after detecting a door lock cylinder switch in the unlock position for greater than 1 second.

Power Door Locks Description and Operation AXC/AXE

The power door lock system consists of the following components:

The power door lock system can be controlled by any of the following:

The front power door lock switches are integral components of the driver door module (DDM) and passenger door module (PDM). The switches are two-position normally open rocker switches. When placed in either the lock or unlock positions, the switches provide a direct input to the DDM or PDM. The DDM or PDM monitor these inputs and send a LAN message indicating a change in the switch position. Modules, that activate the power door lock motors, receive the LAN message and activate the motor in the appropriate direction to lock or unlock the vehicle 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 DDM and PDM to perform the commanded function.

The modules that activate the power door lock motors are:

The DDM and PDM 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. This energizes 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.

The automatic door lock feature can be programmed to control the door lock system. The 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 or passenger door switch will lock the vehicle doors if the following inputs are true:

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 DDM and PDM will lock all doors again.

BCM will unlock all the doors when the transmission is shifted into PARK.

The lockout prevention feature prevents the locking of the driver door if the ignition key is left in the ignition lock cylinder. If a lock command 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, DDM and PDM will lock the doors and then DDM will unlock the driver door.