Rear Compartment Lid Release Operation

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

Interior Rear Compartment Lid Release Switch

The driver door switch panel control module monitors the voltage level of the trunk unlatch signal circuit so that when the switch is pressed contacts within the switch closes providing a ground path for the trunk unlatch signal circuit, the voltage within the signal circuit is pulled low, the driver door switch panel control module will then send a serial data message requesting the release of the rear compartment.

Exterior Rear Compartment Lid Release Switch

The body control module monitors the status of the vehicle doors, if the doors are locked the body control module will ignore the request from the exterior rear compartment lid unlatch switch. If the passenger doors have been commanded to unlock, pressing the exterior rear compartment lid unlatch switch will close contacts within the switch and provide a ground path for the trunk unlatch signal circuit, the body control module will detect the voltage drop and will command the rear compartment lid latch to activate.

If the vehicle has been equipped with the passive keyless entry system and the keyless entry transmitter is within 3 feet (1 meter) of the trunk, pressing the exterior rear compartment lid unlatch switch will also function in the same manner but without unlocking the passenger doors. Refer to Keyless Entry System Description and Operation for more information on the passive keyless entry system.

Rear Compartment Lid Latch

When body control module receives a rear compartment lid release command from either rear compartment lid unlatch switch, the body control module applies brief pulse of voltage to the rear compartment lid latch and it will become energized and the latch will activate releasing the trunk lid so that the trunk lid may be manually raised to an open position.