Keyless Entry: Description and Operation

REMOTE KEYLESS ENTRY

The power door locks/remote keyless entry control system allows the driver to operate the vehicle door locks and Endgate window release from outside the vehicle using a hand-held radio transmitter. The transmitter operates in the UHF band; it sends coded signals to the Keyless Entry Module. The Keyless Entry Module detects and decodes the signal and issues signals to control the door locks and Endgate window release. These systems can also be operated in the usual manner; for instance, the door locks will respond to the power door lock switches. For information on the operation of the Endgate Window Release Refer to "Doors, Hood and Trunk".

LOCK

When the LOCK button is pressed on the transmitter and the Keyless Entry Module receives a signal with a valid Vehicle Access Code (VAC), the lock function sequence is performed. The Keyless Entry Module will lock all doors.
The Keyless Entry Module supplies battery voltage from terminal F to the coil of the Lock Relay (part of the Door Lock Relay Assembly) through the LT BLU (195) wire. The Lock Relay is energized, and battery voltage is supplied to the Door Lock Motors. Ground for the LH Door Lock Motor is provided at the Keyless Entry Module terminal B through internal contacts. Ground for the other door lock motors is provided through the contacts of the UNLOCK Switch, inside the Door Lock Relay Assembly. All door lock motors run to lock all doors.

UNLOCK

The unlock function is separated into two operations depending on how the UNLOCK button is pressed on the transmitter. If the UNLOCK button is pressed once, only the LH door is unlocked. If the UNLOCK button is pressed twice within one to five seconds, the other doors will be unlocked.
When the UNLOCK button is pressed once on the transmitter and the Keyless Entry Module receives a valid VAC, the unlock function sequence is performed. The Keyless Entry Module supplies battery voltage to the LH Front Door Lock Motor through the TAN (694) wire. The motor is grounded through the contacts of the Lock Switch inside the Door Lock Relay Assembly. The LH Door Lock Motor runs to unlock the LH Front Door.
If the UNLOCK button on the transmitter is pressed twice to unlock all doors, the Keyless Entry Module activates the door unlock output at terminal G. The Keyless Entry Module supplies battery voltage to the coil of the unlock relay in the Door Lock Relay Assembly. The unlock relay is energized and closes its contacts. Battery voltage is supplied to the RH Front, LH Rear and RH Rear Door Lock Motors. The motors are grounded through contacts of the Lock Switch, inside the Door Lock Relay Assembly. The Motors run to unlock the RH Front, LH Rear and RH Rear doors.

ENDGATE WINDOW RELEASE

When the Endgate Window Release button is pressed on the transmitter and the Keyless Entry Module receives a valid VAC, the Keyless Entry Module supplies battery voltage at its terminal H. This battery voltage is then applied to the Endgate Window Release solenoid through the Rear Endgate Release Relay.
Ground for the relay is supplied through the Park/Neutral Position switch only in the PARK or NEUTRAL position. This prevents the window from being opened while the vehicle is being driven.