Door/Trunk Ajar Indicator/Lamp: Description and Operation

Door Ajar Indicator Description and Operation

Door Ajar Indicator System Components

The door ajar indicator system consists of the following components:

* Body control module (BCM)

* Instrument cluster

* Driver door latch

* Passenger door latch

* Left rear door latch

* Right rear door latch

* Driver window motor

* Passenger window motor

* Left rear window motor

* Right rear window motor

Driver and Passenger Door Ajar

The front window motors receive a discrete input from the respective door ajar switch within the door latch to indicate the status of the door. The window motors then communicate this status to the BCM via local interconnect network (LIN) bus. The BCM communicates with the instrument cluster via GMLAN message. The instrument panel cluster, upon receipt of this GMLAN message, will illuminate the driver door ajar indicator and also send a GMLAN message to the radio or the chime alarm module to activate the door ajar audible warning when the vehicle speed is greater then 8 km/h (5 MPH).

Rear Passenger Doors Ajar

The rear window motors receive a discrete input from the respective door ajar switch within the door latch to indicate the status of the door. The window motors then communicate this status to the BCM via local interconnect network (LIN) bus. The BCM communicates with the instrument cluster via GMLAN message. The instrument panel cluster, upon receipt of this GMLAN message, will illuminate the appropriate door ajar indicator and also send a GMLAN message to the radio or the chime alarm module to activate the door ajar audible warning when the vehicle speed is greater then 8 km/h (5 MPH).