Keyless Entry: Description and Operation

POWER DOOR LOCKS/REMOTE KEYLESS ENTRY

The power door locks/remote keyless entry control system allows the driver to operate the vehicle door locks and rear 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 Remote Keyless Entry Module. The Remote Keyless Entry Module detects and decodes the signals and issues signals to control the door locks and rear window release and illuminate two courtesy lamps and the front and rear dome lamps. These systems can also be operated in the usual manner; for instance, the door locks will respond to the power door lock switches.

DOOR LOCK OPERATION - SWITCHES

LOCK

When either the LH or RH Door Lock Switches are pressed to the "LOCK" position, voltage is supplied from the PWR ACC Circuit Breaker, through the ORN/BLK (60) wire, through the Door Lock Switch to terminal F of the Door Lock Relay. This voltage energizes the Lock Relay Coil allowing voltage to flow through the relay to the Door Lock Motors, locking all doors. Ground for the LH Door Lock Motor is supplied through the Remote Keyless Entry Module. Ground for the other motor is supplied through the Door Lock Relay.

UNLOCK

When either of the Door Lock Switches are pressed to the "UNLOCK" position, voltage is supplied from the PWR ACC unlocking the doors. (The LH door is unlocked by the Remote Keyless Entry Module.) Ground for the motors is supplied through the Door Lock Relay.

Door LOCK/UNLOCK functions will not operate correctly, if the Remote Keyless Entry Module is disconnected.

DOOR LOCK OPERATION - REMOTE KEYLESS ENTRY

LOCK

When the LOCK button is pressed on, the transmitter and the Remote Keyless Entry Module receives a signal with a valid Vehicle Access Code (VAC), the lock function sequence is performed. The Remote Keyless Entry Module will lock all doors.

The Remote Keyless Entry Module supplies battery voltage from terminal E, to the coil of the Door Lock Relay through the LT BLU (195) wire. The Door 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 Remote Keyless Entry Module terminal C through internal contacts. Ground for the other door lock motor is provided through the contacts of the UNLOCK Switch, inside the Door Lock Relay. All door lock motors run to lock all doors.

When the LOCK button is pressed, both courtesy and both dome lamps will illuminate for approximately 5 seconds and then go out.

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 1-5 seconds, the other doors will be unlocked.

When the UNLOCK button is pressed once on the transmitter and the Remote Keyless Entry Module receives a valid VAC, the unlock function sequence is performed. The Remote Keyless Entry Module supplies battery voltage to the LH Front Door Lock Motor through the TAN (294) wire. The motor is grounded through the contacts of the Lock Switch inside the Door Lock Relay. The LH Door Lock Motor runs to unlock the LH door.

If the UNLOCK button on the transmitter is pressed twice to unlock all doors, the Remote Keyless Entry Module activates the door unlock output at terminal D. The Remote Keyless Entry Module supplies battery voltage to the coil of the unlock relay in the Door Lock Relay. The unlock relay is energized and closes its contacts. Battery voltage is supplied to the RH Door Lock Motor. The motor is grounded through contacts of the Lock Switch, inside the Door Lock Relay. The motor runs to unlock the RH door.

When the UNLOCK button is pressed, both courtesy and the front and rear dome lamps will illuminate for approximately 40 seconds or until the ignition switch is placed in START/RUN.

REAR WINDOW RELEASE

When the Rear Window Release button is pressed on the transmitter and the Remote Keyless Entry Module receives a valid VAC, the Remote Keyless Entry Module supplies battery voltage at its terminal B. This battery voltage is then applied to the Rear Window Release solenoid through the Rear Window Release Control Relay.

Ground for the relay is supplied through the Park/ Neutral switch only in the PARK or NEUTRAL position. This prevents the window from being opened while the vehicle is being driven.