Power Locks: Description and Operation

POWER DOOR LOCK SYSTEM
The power lock system allows all four doors to be locked or unlocked electrically by operating the switch on either front door trim panel. The power lock system operates on non-switched battery current supplied through a fuse in the junction block so that the system remains functional, regardless of the ignition switch position.

All doors can be locked or unlocked electrically by operating the switch on either front door panel.

The rear doors can be locked or unlocked by actuation of the front door switch, or can be locked or unlocked mechanically and independently with their respective locking knobs.

The front doors can be locked or unlocked mechanically with the locking knob regardless of electrical locking and unlocking actuation with the front door knobs.

The right and left front door on all vehicles can be locked or unlocked mechanically from the outside with the key or electrically as described above. The left and right front doors can also be unlocked by actuation of the inside remote door handle.

AUTOMATIC DOOR LOCKS
The system includes an automatic door locking feature actuated by the Body Control Module (BCM).

The vehicle is built with the system enabled.
The BCM will automatically lock all doors when all of the conditions below are met:
- All doors are closed
- The vehicle speed exceeds 15 ± 1 mph.
- The throttle position sensor tip-in is greater than 10 ± 2 degrees

When the system is disabled the door locks will work by use of the door lock switches only. When this system is enabled the automatic door locks will work automatically.

The BCM controls the power locks when the door lock switch is activated. If the door lock switch is pressed for longer than eight consecutive seconds, the BCM will de-energize the door lock relay.

The automatic door lock system can be enabled/disabled either by the customer or with the DRB III(R) scan tool. Refer to the DRB III(R) or the vehicle owners manual for enabling/disabling procedures.

The BCM will automatically re-lock all doors if the above conditions are met and if any of the doors become ajar and then closes again.

The power latches are also equipped with a thermal protection system which prevents the latches from burning out.

CENTRAL LOCKING SYSTEM
The central locking system is part of the Vehicle Theft Security System. This feature allows the doors to be locked/unlocked all at once with the turn of the key in the drivers or passengers side door.

Using the key, turn the driver's or passenger door cylinder lock to the lock position, all doors will lock. This feature operates differently on each door. Turn key in the driver's door to the unlock position once will unlock driver's door only. Turning the key a second time to the unlock position within five seconds of the first time will unlock all doors. Turn key once in the passenger's door to the unlock position will unlock all doors.

The lock/unlock operation will arm/disarm the Vehicle Theft Security System and will also activate/cancel the illuminated entry feature.

CHILD PROTECTION LOCK
The child protection locks are on the rear doors only. When enabled, they render the inside remote door release handles useless preventing small children the ability to open the rear doors when moving or in crowded traffic areas.

The lock when engaged, will disable the inside door handle from opening the door. The lock is part of the latch/lock assembly. The lock is engaged by moving a lever that is located on the rearward inside edge of the door.

DOOR LOCK INHIBIT FEATURE
The door lock inhibit feature is designed to prevent the locking of keys in a vehicle. The drivers door cannot be locked unless the keys are removed from the ignition switch.

With the key in the ignition switch in the ON or OFF position and the driver's door open the BCM will ignore the command to lock the power door locks. Once the key is removed, or the driver's door is closed, the body control module will allow the power door locks to lock.