Keyless Entry: Description and Operation

Door Lock Relay Assembly

The Door Lock Relay Assembly contains two relays, a Lock Relay and an Unlock Relay. The Door Lock Motors are normally grounded through the de-energized Relay's contacts. When the Lock or Unlock Relay is energized, the Relay's contacts close and apply voltage to the Door Lock Motors. The Door Lock Motors will operate anytime one Relay is energized and one Relay is de-energized. The Door Lock Switches or Keyless Entry Module will apply voltage to the appropriate Relay coil in the Door Lock Relay Assembly when operated.

On SSE models, the Power Door Locks can also be operated using the vehicle's key in the door lock. When the key is turned, the Door Lock Cylinder Switches will energize the Lock or Unlock Relay in the Relay Center by grounding the Relay's coil. When the Lock or Unlock Relay is energized, voltage is applied to the Door Lock Relay Assembly through the Lock and Unlock Relays' contacts.

Remote Keyless Entry

The Remote Keyless Entry System includes a hand held radio Transmitter and Keyless Entry Module. The Transmitter sends digitally encoded radio signals to the Module when a button is pushed. Transmitter range is 7 meters (23 feet). The following circuits can be controlled:

1. Illuminated entry lights
2. Door locks (all doors or just driver's)
3. Luggage Compartment Lid Release

Illuminated Entry

The Keyless Entry Module momentarily grounds its output at connector C1 terminal F. This signal is sent to the Illuminated Entry Module, which lights the interior lights for approximately 20 seconds.

Door Locks

When the Transmitter Unlock button is pressed once, the driver's door will be unlocked. The Keyless Entry Module receives the Transmitter signal and activates its output at connector C1 terminal C. This applies battery voltage directly to the LH Front Door Lock Motor which is grounded through the Door Lock Relay Assembly, which remains de-energized.

Pressing the Transmitter Unlock button twice results in the Keyless Entry Module activating its output at connector C1 terminal D. This energizes the Unlock Relay in the Door Lock Relay Assembly and unlocks the RH front and rear doors.

The LR Front Door Lock Motor is driven directly by the Keyless Entry Module.

Pressing the Transmitter Lock Button results in the Keyless Entry Module activating its output at connector C1 terminal E. This energizes the Lock Relay in the Door Lock Relay Assembly and locks the doors. The LH front door is grounded through the Keyless Entry Module when locking.

Theft Deterrent

The Keyless Entry Module is tied to the Theft Deterrent Module via its doorjamb switch and door lock cylinder switch key unlock outputs. When the doors are unlocked using the Transmitter, the output simulates the door being unlocked with a key. This disarms the Theft Deterrent System just as if the door were unlocked using the door key. When the doors are locked using the Transmitter, the Module simulates the Theft Deterrent arming sequence by grounding the door jamb switch output at connector C2, terminal G, by applying battery voltage at the door lock cylinder switch key unlock output at connector C1, terminal G, just as if a door was opened (door jamb switch closed) and power door locks were being activated. The sequence is complete when the ground is removed from the door jamb switch output (simulating closed door).

Luggage Compartment Lid Release

Pressing the Luggage Compartment Lid Release button on the Transmitter activates the output at connector C1, terminal B, of the Keyless Entry Module. This applies battery voltage to the Luggage Compartment Lid Release Solenoid, releasing the Luggage Compartment Lid lock.