Operation

OPERATION

POWER LOCKS


The Totally Integrated Power Module (TIPM) locks or unlocks the doors when an actuation input signal from a door lock switch, Central Lock key cylinder or Remote Keyless Entry (RKE) is received. The TIPM turns on the output drivers and provides a voltage level to the door lock motor for a specified time.

REMOTE KEYLESS ENTRY


The RKE transmitter uses radio frequency signals to communicate with the SKREEM module. The SKREEM is on the PCI bus. When the operator presses a button on the transmitter, it sends a specific request to the SKREEM. In turn, the SKREEM sends the appropriate request over the PCI bus to the following:

- Totally Integrated Power Module (TIPM) - to activate the park lamps, the headlamps and the horn for the horn chirp.
- Power Liftgate Module (PLGM) - to control the liftgate lock and unlock functions.

After pressing the lock button on the RKE 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 (1 or 2) 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 RKE 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 RKE 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 RKE transmitter even in an out of synchronization condition, therefore it could be verified by pressing the LOCK button on the RKE key fob.