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
Two different power lock systems are offered on this model. One system is used on vehicles that are not equipped with the optional Vehicle Theft Security System (VTSS), and a different system is used on models that are equipped with the VTSS option.

Both power lock systems allow all of the doors to be locked or unlocked electrically by operating the switch on either front door trim panel. Both power lock systems operate on non-switched battery current supplied through a fuse in the junction block so that the systems remain functional, regardless of the ignition switch position. Both power lock systems include the power lock switches on each front door trim panel, and the power lock motors inside each door.

The only visible difference between the two power lock systems lies in the location of the system control circuitry and logic, as well as the power lock and unlock relays. Models without the VTSS option have their power lock system control components integral to the power lock and Remote Keyless Entry (RKE) module. Models with the VTSS option have their power lock system control components integral to the Central Timer Module (CTM). However, the CTM based power lock system offers several additional features that are not available with the power lock and RKE module-based system. See Power Lock and Remote Keyless Entry Module, and see Central Timer Module in the Description and Operation for more information.

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.

POWER DOOR LOCKS
The CTM controls the door lock actuation assemblies to handle locking and unlocking with the interior door lock switches or the RKE transmitter (key fob). There is also a door lock inhibit feature that prevents the power locking of the doors if the key is in the ignition or the headlamps are ON and the left front door is open. However, the doors can still be locked using the RKE transmitter which allows the engine to run for warm up purposes.

Automatic (Rolling) Door Locks
When the doors are closed and the vehicle speed exceeds 15 MPH due to engine power (not just rolling) and all doors are closed, the CTM will lock the doors. The vehicle is shipped with the automatic door lock feature disabled, but may be enabled using the DRB.

Door Lock Delay
If the CTM receives a signal to lock the doors and one or both of the auxiliary doors (side or rear) are open, the front doors will still lock. Five seconds after both of the auxiliary door are closed, the CTM will recycle the lock function.

SYSTEM OPERATION

Power Lock And Remote Keyless Entry Module
The power lock and Remote Keyless Entry (RKE) module is used on models that are not equipped with the optional Vehicle Theft Security System (VTSS). This module is mounted on the inboard side of the left center instrument panel support. The module contains the RKE receiver and the RKE system program logic. The relays for the power door locks, the RKE system, and the illuminated entry system are also integral to this module.

The RKE receiver has a memory function to retain the vehicle access code of at least one, but no more than two transmitters. The RKE receiver is designed to retain the transmitter codes in memory, even if the battery is disconnected.

This RKE system includes an illuminated entry feature, which turns on the courtesy lamps for a timed interval (about thirty-five seconds), when the power locks are unlocked using the RKE transmitter. This power lock system includes a delay lock feature. With the delay lock feature, if a side or rear door is still open when a lock request is received by the power lock module, the module will automatically cycle all of the power lock motors to lock five seconds after the doors are closed.

The power lock and RKE module receives inputs from the ignition switch, the power door lock switches, and both the side and rear cargo door jamb switches. It also receives the radio signal input from the RKE transmitter. In response to those inputs, it is programmed to control outputs to the power lock motors and the courtesy lamp circuits.

The power lock and remote keyless entry module cannot be repaired and, if faulty or damaged, it must be replaced.