Circuit/System Description

When the ignition is ON, the BCM supplies a reference voltage to the rear compartment lid release switch, which is part of the headlamp switch assembly, through the trunk release switch signal circuit. When the rear compartment lid release switch is operated, the trunk release signal circuit is grounded through the headlamp switch ground circuit and the reference voltage is pulled low within the BCM. In response, the BCM applies battery positive voltage to the trunk release relay control circuit, which energizes the coil side of the trunk relay. The switch side of the trunk relay then closes, supplying battery positive voltage through the relay and the relay controlled output circuit to the rear compartment lid latch. The rear compartment lid latch, then releases the trunk lid so that it may be manually raised to an open position.