GM Service Manual Online
For 1990-2009 cars only

Unlocking

When operating the Unlock button on the remote coded key, an RF signal is transmitted. If the Unlock button is operated for 0.25 second within approximately 4 metres of the driver's side B-pillar, the BCM receives an unlock request. This is received from the remote coded key via the remote receiver, located in the instrument panel between the defog ducts. The BCM then:

    • Unlocks both the doors (single-stage unlock) or just the driver's door (two-stage unlock)
    • Disarms the theft and entry deterrent systems
    • Turns on the dome lamp
    • Flashes the indicators twice

Locking

When operating the Lock button on the remote coded key for 0.25 second within approximately 4 meters of the driver's side B-pillar, a lock request signal is received by the BCM via the remote receiver. The BCM then:

    • Locks both the doors
    • Arms the theft and entry deterrent systems
    • Turns the dome lamp off if it is illuminated
    • Flashes the indicators once

The vehicle cannot be locked if a door is open or ajar.

Rear Compartment Lid Release

When operating the rear compartment lid release button on the remote coded key for 0.5 second within approximately 2 meters of the rear compartment lid, the BCM checks that the vehicle speed is less than 10 km/h (6mph) then activates the rear compartment lock actuator.

Remote Coded Key Battery Failure

The remote coded key is powered by its own internal battery. If this battery fails, no RF signal is transmitted when operating the lock, unlock and boot release buttons. However, the remote coded key reader has the ability to power the key when the key is inserted into the ignition switch and turned on, or to the start position. This enables theft deterrent disarming.