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 9-16 volts.

The door ajar indicator is on at all times.

Schematic Reference

Door Lock/Indicator Schematics

Connector End View Reference

Component 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

Without RPO AXC/AXE

Ignition ON, with all doors closed, observe the scan tool Driver Door Ajar Sw., Passenger Door Ajar Sw., Left Rear Door Ajar Sw. and Right Rear Door Ajar Sw. parameters while opening and closing each door. The parameters should change between Door Closed and Door Ajar.

With RPO AXC/AXE

With the rear doors closed, observe the scan tool Left Rear Door Ajar Sw. and Right Rear Door Ajar Sw. parameters while opening and closing each door. The parameters should change between Door Closed and Door Ajar.

Door Ajar Malfunction

1. Ignition ON, with all doors closed, verify the scan tool Driver Door Ajar Sw., Passenger Door Ajar Sw.,Left Rear Door Ajar Sw. and Right Rear Door Ajar Sw. parameters are Door Closed.

⇒	If not the specified value, test the signal circuit terminal listed below for a short to ground. If the circuit tests normal, replace the BCM.

•	Driver door latch terminal 6.

•	Left rear door latch terminal 4.

•	Passenger door latch terminal 1.

•	Right rear door latch terminal 1

2. If all circuits test normal, test or replace the appropriate door latch.

Rear Door Ajar Malfunction

1. Ignition ON, with all doors closed, verify the scan tool Left Rear Door Ajar Sw. and Right Rear Door Ajar Sw. parameters are Door Closed.

⇒	If not the specified value, test the signal circuit terminal listed below for a short to ground. If the circuit tests normal, replace the BCM.

•	Left rear door latch terminal 4.

•	Right rear door latch terminal 1

2. If all circuits test normal, test or replace the appropriate door latch.

1. Ignition OFF, disconnect the harness connector at the appropriate door latch.
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 terminal 6 and terminal 8.

•	Left rear door latch terminal 4 and terminal 6.

•	Passenger door latch terminal 1 and terminal 3.

•	Right rear door latch terminal 1 and terminal 3.

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

3. With the switch in the closed position, test for less than 2.0 ohms between the signal and the ground terminals listed below:

•	Driver door latch terminal 6 and terminal 8.

•	Left rear door latch terminal 4 and terminal 6.

•	Passenger door latch terminal 1 and terminal 3.

•	Right rear door latch terminal 1 and terminal 3.

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

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.