Power Locks - Operation

OPERATION

POWER LOCKS

The power lock system allows all of the doors to be locked or unlocked electrically by operating a switch on either front door trim panel. When an actuation input signal from the door lock switch, WIN or FOBIK signal is received, the door modules turns on the output drivers a provides a voltage level to the door lock motor for a specified time to lock/unlock the door. Their are two door modules, the Driver Door Module (DDM) and Passenger Door Module (PDM). The door modules have an unswitched battery feed from the TIPM, so the locks can be actuated in any ignition switch position.

REMOTE KEYLESS ENTRY

The FOBIK transmitter uses radio frequency signals to communicate with the WIN. The WIN is on the CAN bus. When the operator presses a button on the transmitter, it sends a specific request to the WIN. In turn, the WIN sends the appropriate request over the CAN bus to the following:
- Totally Integrated Power Module (TIPM) - to activate the park lamps, the headlamps and the horn for the horn chirp.
- Door Control Modules - to activate the door locks and windows.

After pressing the lock button on the FOBIK transmitter, all of the door locks will lock, the illuminated entry will turn off (if all doors are closed) and the vehicle theft security system (if equipped) will arm.

Pressing the unlock button one time will unlock the driver door, or all doors based on the customer programmable feature enabled, the illuminated entry will turn on the courtesy lamps and the vehicle theft security system (if equipped) will disarm. Pressing the unlock button a second time, the remaining door locks will unlock.

If the vehicle is equipped with the memory system, the memory message will identify which transmitter sent the signal.

ROLLING CODE

The rolling code feature changes part of the transmitter message each time that it is used. The transmitter message and the receiver message increment together. Under certain conditions with a rolling code system, such as pressing a button on the FOBIK transmitter over 255 times outside of receiver range or replacing the battery, the receiver and transmitter can fall out of synchronization. To re-synchronize, press and release the UNLOCK button on the FOBIK transmitter repeatedly (it may take up to eight cycles) while listening carefully for the power door locks in the vehicle to cycle, indicating that resynchronization has occurred.
The lock function works from the FOBIK transmitter even in an out of synchronization condition, therefore it could be verified by pressing the LOCK button on the FOBIK.