For vehicles without RPO AXC/AXE, the body control module (BCM) receives a discrete input from each of the 4 jamb switches and for vehicles with RPO AXC/AXE the BCM will only receive discrete input from the rear door jamb switches to indicate the status for each door. The BCM then communicates this status to the instrument panel cluster (IPC) via a serial data message. The IPC, upon receipt of this serial data message, will illuminate the appropriate ajar message in the driver information center (DIC) and also send a serial data massage to the radio to activate the door ajar audible warming when the transmission is removed from PARK and the vehicle speed is greater then 8 km/h (5 mph).

The door ajar switches supply a ground to the BCM when the door is open. Once the door is closed the door ajar switch opens removing the ground to the BCM. The BCM sends a signal to the IPC to turn on the door ajar light when a door is open.

The system voltage is 9-18 volts.

The BCM receives a voltage signal on the driver door ajar circuit.

The ajar indicator is on at all times.

Schematic Reference

Door Lock/Indicator Schematics

Connector End View Reference

Vehicle Access Connector End Views

Description and Operation

Door Ajar Indicator Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, with all doors closed, observe the scan tool Door Ajar Switch parameters while opening and closing all doors. The parameters should change between Closed and Ajar.

1. Ignition OFF, disconnect harness connector at the appropriate door latch assembly.
2. Ignition ON, verify the appropriate scan tool Door Ajar Sw. parameter is Door Closed.

⇒	If not the specified value, test the signal circuit listed below for a short to ground:

•	Driver door latch assembly signal circuit terminal 6.

•	Left rear door latch assembly signal circuit terminal 4.

•	Passenger door latch assembly signal circuit terminal 1.

•	Right rear door latch assembly signal circuit terminal 1

⇒	If the circuit tests normal, replace the BCM.

3. If all circuits test normal, test or replace the door latch assembly.

1. Ignition OFF, disconnect the harness connector at the appropriate door latch assembly.
2. With the switch in the open position, test for infinite resistance between the signal terminal and the ground terminal listed below:

•	Driver door latch assembly signal terminal 6 and ground terminal 8.

•	Left rear door latch assembly signal terminal 4 and ground terminal 6.

•	Passenger and right rear door latch assembly signal terminal 1 and ground terminal 3.

⇒	If not the specified value, replace the door latch assembly.

3. With the switch in the closed position, test for less than 1.0 ohms between the signal and the ground terminals listed below:

•	Driver door latch assembly signal terminal 6 and ground terminal 8.

•	Left rear door latch assembly signal terminal 4 and ground terminal 6.

•	Passenger and right rear door latch assembly signal terminal 1 and ground terminal 3.

⇒	If not the specified value, replace the door latch assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.