Keyless Entry: Description and Operation

The Remote Keyless Entry (RKE) Control System allows a driver to operate several vehicle features from outside the car using a hand-held radio transmitter. The transmitter operates in the UHF band; it sends coded signals to the Keyless Entry Module via an antenna in the trunk. The Keyless Entry Module detects and decodes the signals and issues signals to control the door locks, trunk release, theft deterrent and illuminated entry. These systems also can be operated in the usual manner; for instance, the door locks still will respond to the power door lock switches.

Lock (U.S.A./Canada Only)
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 module will lock all doors and simulate the theft deterrent arming sequence.

The module supplies battery voltage, pin C3, through the contacts of the Lockout Inhibit Relay to the coil of the Door Lock Relay's lock relay. The lock relay is energized, and battery voltage is supplied to the door lock motors. The purpose of the Lockout Inhibit Relay is to prevent the doors from being locked with the key still in the ignition. Ground for the LH Front Door Lock Motor is provided at the Keyless Entry Module terminal C16 through internal contacts. Ground for the RH Front Door and Rear Door Lock Motors is provided through the contacts of the unlock relay of the Door Lock Relay.

When the ignition is OFF, the Keyless Entry Module will arm the Theft Deterrent System (if equipped) by applying voltage from terminal C3 to the Theft Deterrent Module. The Keyless Entry Module then grounds the door ajar output, terminal C9, to simulate the door opening. After all doors lock, the door ajar output will be ungrounded to simulate the door being closed. The Theft Deterrent System is now armed. If the ignition is in RUN, the Keyless Entry Module will lock all doors, but the Theft Deterrent System will not be armed.

When the unlock button is pressed once on the transmitter, and the Keyless Entry Module receives a signal with a valid VAC, the unlock function sequence is performed. The Keyless Entry Module will simultaneously start three operations.
1. The Keyless Entry Module will activate the illuminated entry output pin C7. The output signal is a pulsed signal, which is applied to the RAP/Illuminated Entry (RAPIE) Module The RAPIE will then provide a ground for the Courtesy Lights Relay.
2. The Keyless Entry Module activates the theft deterrent disarm output at terminal C8. If equipped, the Theft Deterrent Module terminal H is pulled to ground which disarms the Theft Deterrent System.
3. The Keyless Entry Module will activate its LH door unlock output at terminal C16. Voltage will be supplied to the LH Front Door Lock Motor. The motor is grounded through the contacts of the lock relay in the Door Lock Relay. The LH Front Door Lock Motor now unlocks the door.

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 front door is unlocked. If the unlock button is pressed a second time within 1 1/2 seconds, all doors will be unlocked. In both cases, theft deterrent is disarmed and illuminated entry is activated.

If the unlock button on the transmitter is pressed twice to unlock all doors, the Keyless Entry Module will perform the same three unlock operations listed above. It will also activate the door unlock output at terminal C2. The Keyless Entry Module will then supply 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 other door lock motors. The motors are grounded through the contacts of the lock relay in the Door Lock Relay.

Central Door Unlock
All doors are unlocked automatically if the key is turned to unlock twice or held in the unlock position in either door lock cylinder. The door lock cylinder input (terminal C8) is grounded through the Door Lock Cylinder Switch. After receiving this input signal the Keyless Entry Module will activate the door unlock output (terminal C2) and the LH front unlock output (terminal C16). All doors will unlock.

Trunk Release (U.S.A./Canada Only)
When the transmitter trunk release button is pressed with the ignition off and the Keyless Entry Module receives a signal with a valid VAC, the Keyless Entry Module will supply battery voltage to release the trunk at its terminal C1. Battery voltage is then applied to the Trunk Lid Release Solenoid. The Trunk Lid Release Solenoid is energized and the trunk lid is opened. The trunk lid will not be released if the ignition is in RUN and the gear selector is out of the PARK position. The Keyless Entry Module monitors gear position at its park input (terminal C13).

Illuminated Entry (U.S.A./Canada Only)
When the light button is pressed and the Keyless Entry Module receives a signal with a valid VAC, the Keyless Entry Module will activate the illuminated entry output in the RAPIE Module, which turns on the courtesy lights. Operation of the courtesy lights is similar to the operation described earlier under the Unlock heading.

Automatic Door Locks (ADL)
The automatic door lock feature locks the doors when the gear selector is moved out of PARK and will unlock the doors when returned to the PARK position. This feature will only operate when the ignition is in RUN.

When the gear selector is moved from the PARK position, the park input (terminal C13) of the Keyless Entry Module senses the gear selector changing gears. The module then sends a voltage pulse (terminal C3) to the Door Lock Relay and the doors lock.

The doors are unlocked automatically when the Keyless Entry Module senses that the gear selector has returned to the PARK position. The module (terminal C2) then sends a voltage pulse to the Door Lock Relay. The LH door unlock output (terminal C16) is also activated. All doors unlock.