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

* Instrument cluster

* Driver door latch

* Passenger door latch

* Left rear door latch

* Right rear door latch

* Driver window motor (AXG)

* Driver window switch (AEC)

* Passenger window switch (AED)

* Left rear window switch ( AEQ)

* Right rear window switch (AEQ)

Door Ajar System

Depending upon if the vehicle is equipped with express up/down power windows, express down only power windows affects how the driver and passenger door ajar signal circuits are configured and monitored.

Driver Door Ajar (AXG)

The driver window motor will provide a 12V signal to the driver door ajar switch within the door latch to indicate the status of the door. When the driver door is open, the contract within the ajar switch closes providing a ground part for the signal circuit. The driver window motor will detect the voltage drop in the ajar signal circuit and will send a serial data message to the body control module. The body control module will then send a message to the instrument cluster which will illuminate the door ajar icon.

Driver, Passenger and Rear Doors Ajar (AEC, AED and AEQ)

The driver, passenger and rear window switches provide a 12V signal to the respective door ajar switch within the door latch to indicate the status of the door. When the door is open, the contract within the ajar switch closes providing a ground part for the signal circuit. The window switch will detect the voltage drop in the ajar signal circuit and will send a serial data message to the body control module. The body control module will then send a message to the instrument cluster which will illuminate the door ajar icon.