Operation CHARM: Car repair manuals for everyone.

General Information

Remote Lock Control Transmitter (Typical):




The Remote Keyless Entry System allows the driver to unlock the drivers door, unlock all doors, lock all doors or release the luggage compartment lid by the use of a hand held transmitter.

The range of the transmitter is approximately 7 meters (23 feet). If the transmitter range becomes less than approximately 7 meters (23 feet) the battery in the transmitter may need replacing. Refer to "Battery Replacement - Transmitter". The maximum range of the transmitter is dependent upon ambient conditions as well as other operating parameters.

Under some conditions the range of the transmitter be decreased from normal range or the receiver may not operate due to interference from anonymous radio signal transmissions. Therefore, the door lock key (oval head) should be attached to the ring on the transmitter so it will be available if needed.

When the drivers door or trunk is unlocked by using the transmitter the interior lamps are turned on and remain on for approximately 40 seconds or until the ignition switch is turned to the "RUN" position.

This GM vehicle does have door jamb switches on the front doors. Interior lamps are controlled by a switch mounted on the door handle. Two and four door models use door jamb switches on the front and rear doors to control the interior lamps when a rear door s open. The multi-function module controls the interior lamps when any door is opened. The Remote Keyless Entry Module controls (turns on) the interior lamps when the UNLOCK or TRUNK button on the transmitter is pressed.

Serial data is transmitted on a radio frequency carrier signal at 315 MHz from the transmitter to the Remote Keyless Entry Module (receiver) when one of three buttons on the transmitter is pressed. The three buttons are:
1. Lock Doors.
2. Unlock Door(s).
3. Luggage Compartment Release.
The transmitter is resistant to moderate temperature changes, shock, moisture, dust and most common household and automotive fluids.