Keyless Entry: Description and Operation

Circuit Operation

The Remote Keyless Entry (RKE) Control System allows the driver to operate the vehicle door Locks and Trunk Release 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. The Keyless Entry Module detects and decodes the signals and issues signals to control the Door Locks and Trunk Release. These systems can also be operated in the usual manner; for instance, the Door Locks will respond to the Power Door Lock Switches.

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 to the coil of the Lock Relay. 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 Keyless Entry Module terminal B through internal contacts. Ground for the other Door Lock Motor(s) is provided through the contacts of the Unlock Relay of the Power Door Lock Relay. 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 1 to 5 seconds, both doors will be unlocked.

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 supply battery voltage to the LH Door Lock Motor via the TAN (694) wire. The motor is grounded through the contacts of the Lock Relay in the Power 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 Keyless Entry Module will activate the Door Unlock output at pin 0. The Keyless Entry Module will then supply battery voltage to the coil of the Unlock Relay in the Power Door Lock Relay. The Unlock Relay is energized and closes its contacts. Battery voltage is supplied to all Door Lock Motors except the LH Front. The motors are grounded through the contacts of the Lock Relay in the Power Door Lock Relay. The motors run to unlock the doors.

TRUNK RELEASE

When the Trunk Release Button is pressed on the Transmitter and the Keyless Entry Module receives a signal with a valid VAC, the Keyless Entry Module will supply battery voltage at its terminal H. This battery voltage is then applied to the Trunk Release Solenoid. The Release Solenoid is energized and the Trunk Lid can be opened. If the Ignition Switch is ON, and the transaxle Position Switch is not in Park, battery voltage is not supplied to Keyless Entry Module terminal D and the Trunk Lid will not open.