Power Door Locks Description and Operation
Door Lock System Components
The power door lock system consists of the following components:
| • | Central door lock switch (located with the radio/HVAC controls) |
| • | Rear window/door lockout switch (located on the driver window switch) |
| • | Body control module (BCM) |
| • | Door lock security PCB relay |
Door Lock and Unlock Operation
When a door lock switch is activated in the lock or unlock position the BCM will receive a ground 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 supply battery voltage to the door lock actuator lock or unlock control circuits. Since the opposite side of the lock actuator is connected to ground through the other lock actuator control circuit, the doors will then lock or unlock as commanded.
The following three circuits are used to operate the lock:
The driver door lock actuator is isolated so it can be unlocked by itself using the keyless entry transmitter.
Child Door Lockout Operation
The operator has the option to disable the interior rear door handles to prevent the unauthorised opening of the rear door doors while still retaining normal driver and passenger door handle functions. The driver door window switch has a lockout switch that will disable the interior rear door handles and the rear window switches. The rear door latches contain switches that are open when the rear doors are unlocked and closed when the rear doors are locked. The operator will first lock all the doors by pressing the central door lock switch. When the lockout switch is pressed, the BCM will confirm that the rear doors have been locked, if the rear doors are locked the BCM will then command the child lockout latches. The driver and passenger doors will still function normally by pressing the central door lock switch which will unlock the doors but the child lockout latches will continue to disable the interior rear door handles. Pressing the lockout switch again will signal a command to the BCM to unlatch the rear doors, restore normal interior rear door handle functions and restore normal function of the rear window switches. If the lockout indicator flashes while trying to lockout the rear door handles means one or both rear door latches are not locked and the child lockout system will not function.
| ©© Copyright Chevrolet. All rights reserved |
