Door Lock System Components
The power door lock system consists of the following components:
| • | Driver door lock switch--Provides a switched voltage signal to the
body control module (BCM) for both lock and unlock switch activations |
| • | Front passenger door lock switch--Provides a switched voltage signal
to the BCM for both lock and unlock switch activations |
| • | Door lock relay--Located in the instrument panel (I/P) fuse block
and controls the locking of all doors |
| • | Door unlock relay--Located in the I/P fuse block and controls the
unlocking of all doors without keyless and the unlocking of the passenger doors with
keyless entry |
| • | Driver door unlock relay--Located in the right I/P fuse block and
controls the unlocking of the driver door if equipped with keyless entry |
| • | BCM--Class 2 module which requires programming when replaced |
| • | Reversible door lock actuators in each of the doors |
| • | LOCK/MIRROR 10 A fuse--Located in the I/P fuse block, supplies
power for the door lock switches |
| • | DR LOC 20 A fuse--Located in the I/P fuse block, supplies
power for the relays |
Door Lock System Controls
The power door lock system can be controlled by any of the following:
| • | Power door lock switch activation |
| • | Keyless entry lock or unlock command, if equipped |
| • | Delayed locking command |
| • | Automatic door lock command |
| • | Lockout prevention command |
Door Lock and Unlock Operation
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/unlock signal circuits.
The BCM, upon receipt of a door lock switch lock or unlock signal, will switch
the appropriate door lock relay control circuits to battery positive voltage. This
will energize the appropriate lock or unlock relays. The relay will supply voltage
to the door lock actuator lock or unlock control circuits to one side of the lock
actuator. The opposing side of the lock actuators are connected to ground through
the other lock actuator control circuit and the normally closed contacts of the lock
or unlock relay, and the doors and liftgate will lock or unlock appropriately.
Vehicles equipped with keyless entry to utilize only the driver door unlock
relay to isolate the driver door lock actuator so it can be unlocked by itself using
the keyless entry transmitter.
Automatic Door Lock Operation
This body control module (BCM) controlled feature can be personalized to driver
preference. Refer to
Vehicle Personalization
in Personalization.
The BCM will automatically lock the vehicle doors if the following conditions
exist:
| • | All vehicles doors are closed. |
| • | The ignition is in the ON position. |
| • | The vehicle is shifted out of PARK. |
The BCM will then unlock the doors when the ignition is placed in the OFF position.
Delayed Locking Operation
With any door open and a door lock switch is activated in the lock position,
the body control module (BCM) will give 3 audible chimes. When the door is
closed, the BCM will cycle the internal door lock relay to lock the doors after approximately
5 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.
Lockout Prevention Operation
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.
Unlock After Air Bag Deployment
This feature will unlock all of the vehicle doors 15 seconds after an
air bag deployment.
