GM Service Manual Online
For 1990-2009 cars only

The rear compartment lid release relay is controlled by the body control module (BCM). The rear compartment lid release is operated by pressing the rear compartment lid release switch inside the vehicle when the ignition switch is in the ACCY or RUN position.

Battery voltage is applied at all times from the PWR ACCY Fuse through circuit 640 to the normally open contacts of the rear compartment lid release relay from PWR ACCY Fuse 7.

When the rear compartment lid release switch is pressed, ground is applied from G200 through circuit 650, the switch and circuit 1576 to the rear compartment lid release signal input of the BCM. The BCM then applies voltage through circuit 253 to the rear compartment lid release relay coil.

Ground is applied to the relay coil through circuit 33 or circuit 816 under either of the following conditions:

    â€¢ For automatic transmission, the park neutral position switch is in (P) Park or (N) Neutral
    â€¢ For manual transmission, the park brake switch is closed

The normally open relay contacts close and voltage is applied from the relay through circuit 56 to the rear compartment lid release actuator. Ground is applied to the actuator from G400 through circuit 1550 and the rear compartment opens.

The rear compartment lid release actuator contains an electronic circuit breaker  (ECB). The ECB resistance increases if the motor is overloaded. Resistance returns to normal after the voltage is removed from the actuator terminals.

Hatch Ajar Indicator

The hatch ajar indicator receives battery voltage with the ignition switch is in the following positions:

    â€¢ RUN
    â€¢ START

The hatch ajar indicator is controlled by the rear compartment lid ajar indicator switch. The rear compartment lid ajar indicator switch closes when the rear compartment lid is open or ajar. The indicator turns on when the switch closes and ground is applied to the hatch ajar indicator through circuit 737.

The hatch ajar indicator also illuminates for approximately 3 seconds when the ignition switch is in the BULB TEST position.