Keyless Entry: Description and Operation

The Keyless Entry System allows the driver to unlock the doors or trunk lid (Liftgate with wagon) from outside the vehicle, without using a key. The system is controlled by a Keyless Entry Module.

The Keyless Entry Module also contains circuitry for the illuminated entry and automatic door locking (autolock) functions.

Illuminated Entry

The illuminated entry circuitry can be activated by the Door Handle Switches or the Keyless Entry Switch Assembly. Lifting either door handle turns on the interior courtesy lamps and the Lock Cylinder Lamps for about 25 seconds. Pressing any button on the Keyless Entry Switch Assembly turns on these same lamps, as well as the Keyless Entry Switch Assembly illumination lamp. The courtesy lamps allow the driver to inspect the interior of the vehicle before entering it. The Lock Cylinder Lamps allow the driver to easily locate the lock cylinders in low light conditions.

Automatic Door Locking (Except SHO)

The autolock circuitry automatically locks all the doors if the Ignition Switch is in RUN, the driver's seat is occupied, all the doors are closed, and the gearshift lever is shifted into or through REVERSE.

MODULE INPUTS

Manual Lever Position Sensor (MLPS)

With the Ignition Switch in RUN, voltage is present at the Manual Lever Position Sensor (MLPS). If the gearshift lever is shifted into or through REVERSE, the Switch contacts close, applying voltage to circuit 140 (BK/PK) and the Keyless Entry Module (and Backup Lamps). This signal is used to activate the autolock function if other conditions are met.

Door Handle Switches

Raising either front door handle closes that door's Door Handle Switch, whether the door is locked or unlocked. The Keyless Entry Module uses this signal to activate the illuminated entry function.

Door Latch Switches

Opening any door causes the Door Latch Switch in that door to close, grounding circuit 627 (BK/O) to the Keyless Entry Module. A partially closed door will also cause this "door open" input to the Module. The Module uses this input to disable the autolock function.

Door Lock Switches

On vehicles equipped with Keyless Entry, the Keyless Entry Module controls the Door Lock Motors. Moving either Door Lock Switch to the LOCK (or UNLOCK) position grounds circuit 119 (PK/Y) (or 120 [PK/LG]) to the Module. The Module then powers the Door Lock MOtors to lock or unlock the door.

Keyless Entry Switch Assembly

The Keyless Entry Switch Assembly is mounted on the outside panel of the driver's door. The Switch Assembly has five push-button switches. Pressing any Switch Assembly button activates the illuminated entry system.

Entering the correct code number at the Switch Assembly will prompt the Keyless Entry Module to unlock the driver's door. Pressing the "3/4" switch within five seconds after the driver's door unlocks will unlock the other three doors. Pressing the "5/6" switch within five seconds after the driver's door unlocks will unlock the trunk lid (liftgate with wagon).

Pressing the "7/8" and "9/0" buttons at the same time locks all doors.

The Keyless Entry Switch Assembly is also used to enable or disable the autolock function. To enable automatic door locking, the driver must first enter the correct code at the Switch Assembly. Then, while pressing and holding the "7/8" button, the "3/4" button must be pressed. Using the same procedures, autolocking is disabled.

Seat Switch

With the driver's seat occupied, the Left Front Seat Switch contacts close, grounding circuit 177 (W) to the Keyless Entry Module. The Keyless Entry Module uses this input to activate the autolock function if other conditions are met.

MODULE OUTPUTS

Door Lock Motors

The Door Lock Motors are reversible motors controlled directly by the Keyless Entry Module; no door lock relay is used. The Module passes current through the motors in the direction necessary to lock or unlock the doors.

Trunk Lid Released Solenoid (Liftgate Release Solenoid with Wagon)

When the proper sequence of buttons is pressed at the Keyless Entry Switch Assembly, the Keyless Entry Module applies voltage to circuit 84 (P/Y) and 486 (BR/W) (with wagon). The Trunk Lid/Liftgate Released Solenoid energizes to unlatch the trunk lid/liftgate.