Power Locks: Description and Operation

INTRODUCTION
Power door locks are optional factory-installed equipment on this model. The Remote Keyless Entry (RKE) system, illuminated entry system and power windows are included on vehicles equipped with the power door lock option.

POWER LOCK SYSTEM
The power lock system allows both doors to be locked or unlocked electrically by operating the switch on either 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.

The power lock system includes the power lock switches on each door trim panel, and the power lock motors inside each door. The power lock control circuitry and the power lock and unlock relays are integral to the high-line version of the Central Timer Module (CTM), which is mounted under the instrument panel.

The CTM controls the door lock actuator assemblies to handle locking and unlocking with the key fob or interior switch. There is also a door lock inhibit feature that prevents power locking of the doors if the ignition is off, the door is open, and the key is in the ignition. Automatic or "rolling locks" are included as a DRB III(R) or customer programmable feature. If the vehicle is moving approximately 15 mph and approximately 10 degrees of throttle opening is seen by the PCM, (the PCM will send this info to the CTM via the CCD bus) indicating acceleration, the CTM will cycle the lock actuators to lock the doors.

ENHANCED ACCIDENT RESPONSE (HIGHLINE CTM ONLY)
If the Airbag Control Module (ACM) deploys the airbags, a message is transmitted over the CCD bus to the CTM module to unlock the doors. The interior lights will be turned on when the vehicle speed message on the CCD bus indicates 0 mph or the message is not present. In addition to unlocking the doors, the door lock feature will be disabled for a predetermined amount of time following the deployment. Once the ignition key has been cycled to the "off" position, normal operation will resume.

Refer to the owner's manual in the vehicle glove box for more information on the features, use and operation of the power lock system.