The rear compartment lid release system consists of the following components:

The interior rear compartment lid release switch receives a signal from the driver door switch assembly (DDSA). When the interior rear compartment lid release switch is activated the signal circuit is pulled to ground. The DDSA interprets this and sends a GMLAN serial data message to the RIM requesting the rear compartment lid be released. The rear integration module (RIM) grounds the trunk release relay control circuit which energizes the TRK DR REL relay. The trunk release relay is supplied with battery voltage at all times. With the relay coil energized, the relay switch contacts close allowing battery voltage to flow to the rear compartment lid release actuator causing the rear compartment lid to release. The rear compartment lid release actuator is permanently grounded at G402. When the rear compartment lid release actuator releases the rear compartment lid, the rear compartment lid ajar switch, which is internal the rear compartment lid release actuator, is supplied with ground which causes the trunk ajar switch signal circuit to be pulled low. The trunk ajar switch signal circuit is an input to the RIM. When the RIM receives a trunk ajar signal, a GMLAN serial data message is sent to the instrument panel cluster (IPC) requesting the TRUNK OPEN message be displayed on the message center.

The exterior rear compartment lid release switch receives a signal from the remote control door lock receiver (RCDLR). When the exterior rear compartment lid release switch is activated the signal circuit is pulled to ground. The RCDLR interprets this and sends a GMLAN serial data message to the RIM requesting the rear compartment lid be released. The rear integration module (RIM) grounds the trunk release relay control circuit which energizes the TRK DR REL relay. The trunk release relay is supplied with battery voltage at all times. With the relay coil energized, the relay switch contacts close allowing battery voltage to flow to the rear compartment lid release actuator causing the rear compartment lid to release. The rear compartment lid release actuator is permanently grounded at G402.

The valet lockout switch is closed in the normal or non-valet position. When closed it supplies positive voltage to the valet lockout switch signal input to the IPM and the garage door opener. When the valet lockout switch is open in the valet position, positive voltage will not be detected by the IPM and the garage door opener will not have positive voltage. This is the Valet Lockout position. The IPM sends a serial data message containing the status of the valet lockout switch.