Power Locks: Description and Operation

POWER DOOR LOCKS DESCRIPTION AND OPERATION

POWER DOOR LOCKS SYSTEM COMPONENTS
The power window system consists of the following components:
- The BCM
- LF door lock switch
- RF door lock switch
- Driver door lock cylinder switch
- RF door lock cylinder switch
- Liftgate door lock cylinder switch
- Door lock actuators in each of the doors
- Door lock system fuse into the BCM, PWR LOCK 20A fuse

DOOR LOCK SYSTEM CONTROLS
The power door lock system is controlled by the BCM and can be activated by any one of the following:
- A door lock switch Lock or Unlock actuation
- A door lock cylinder switch Lock or Unlock actuation
- A keyless entry transmitter actuation
- An automatic door lock actuation, a Personalization function
- An automatic door unlock actuation, a Personalization function
- A last door closed locking actuation, a Personalization function

DOOR LOCK OPERATION
When the BCM detects a transition of either of the door lock switches to the Lock position, it switches the door lock actuator lock control circuit to voltage.
Since the lock actuator unlock control circuits are at ground potential within the BCM, the door lock actuator motors transition to the Lock position.

DRIVER DOOR UNLOCK OPERATION
When the BCM detects a transition of either of the door lock switches to the Unlock position, it switches the driver door lock actuator unlock control circuit to voltage. Since the door lock actuator lock control circuit is at ground potential within the BCM, the LF door lock actuator motor transitions to the Unlock position.

The driver door lock actuator unlock control circuit is a dedicated control circuit used only for the driver door lock actuator motor. This is done so that the driver door may be unlocked by itself using a keyless entry transmitter or an automatic door unlock function, if programmed.

PASSENGER DOOR UNLOCK OPERATION
When the BCM detects a transition of either of the door lock switches to the Unlock position, it switches the door lock actuator unlock control circuits to voltage.

Since the door lock actuator lock control circuit is at ground potential within the BCM, the passenger door lock actuator motors transition to the Unlock position.
The door lock actuator unlock control circuits are dedicated control circuits used only for the passenger door lock actuator motors. This is done so that the driver door may be unlocked separate from the passenger doors using a keyless entry transmitter or an automatic door unlock function, if programmed.

AUTOMATIC DOOR LOCK/UNLOCK
The automatic door lock/unlock function is a Vehicle Personalization feature with the following four programmable modes of operation:
1. The automatic door lock feature is disabled.
2. All of the doors lock when the vehicle is shifted out of Park with the ignition ON.
3. All of the doors lock when the vehicle is shifted out of Park with the ignition ON, and only the driver door Unlocks when the vehicle is shifted into Park.
4. All of the doors lock when the vehicle is shifted out of Park with the ignition ON, and all of the doors Unlock when the vehicle is shifted into Park.
5. All of the doors lock when the vehicle is shifted out of Park with the ignition ON, and only the driver door Unlocks when the key is removed from the ignition with the vehicle in Park.
6. All of the doors lock when the vehicle is shifted out of Park with the ignition ON, and all of the doors Unlock when the key is removed from the ignition with the vehicle in Park.

The automatic door lock function can only be enabled by the BCM if the driver door switch is in the Inactive, closed state. For information on programming the automatic door locks, refer to Vehicle Personalization in Personalization.

SLIDING DOOR DELAYED LOCKING
The sliding door delayed locking function is a Vehicle Personalization feature. After the BCM has detected that the sliding door is closed, the BCM will lock the doors after a 3 second delay. The sliding door delayed locking function will be overridden if the BCM receives a door Unlock input, a last door closed locking initiation, or if the BCM senses that the sliding door is open.

LOCKOUT PREVENTION
This function is intended to prevent the vehicle operator from locking the doors if the key is left in the ignition and the driver door is open.

The lockout prevention function can be overridden by the BCM if the BCM receives a door Lock input for longer than 3 seconds.

LAST DOOR CLOSED LOCKING
The last door closed locking function is a Vehicle Personalization feature that is intended to allow the doors to be locked while passengers are exiting the vehicle. When last door closed locking function is in Active Mode, the BCM will delay locking of the vehicle doors for 5 seconds after all of the doors have been closed. The last door closed locking function will be overridden if the BCM receives a door Unlock input or a key in ignition input.

KEY CYLINDER UNLOCK
The BCM will unlock all of the doors after detecting a door lock cylinder switch in the Unlock position for greater than 1 second.

KEY CYLINDER LOCK
The BCM will lock all of the doors after detecting a door lock cylinder switch in the Lock position.