B2976
DTC B2976
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptor
DTC B2976 00
- Door Ajar Circuit
Diagnostic Fault Information
Circuit/System Description
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.
Conditions for Running the DTC
The system voltage is 9-18 volts.
Conditions for Setting the DTC
The BCM receives a voltage signal on the driver door ajar circuit.
Action Taken When the DTC Sets
The ajar indicator is on at all times.
Conditions for Clearing the DTC
* The DTC will be current for as long as the fault is present.
* When the fault is no longer present, the DTC will become a history DTC.
* A history DTC will clear after 50 ignition cycles.
Circuit/System Verification
Ignition ON, with all doors closed, observe the scan tool Door Ajar Switch parameter while opening and closing all doors. The reading should change between Closed and Ajar.
Circuit/System Testing
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 appropriate signal circuit listed below for a short to ground:
* Driver door latch assembly signal circuit terminal 6. (Without RPO AXC/AXE)
* LR door latch assembly signal circuit terminal 4.
* Passenger door latch assembly signal circuit terminal 1. (Without RPO AXC/AXE)
* RR 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 appropriate door latch assembly.
Component Testing
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.
* LR door latch assembly signal terminal 4 and ground terminal 6.
* Passenger and RR door latch assembly signal terminal 1 and ground terminal 3.
^ If not the specified value, replace the appropriate 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.
* LR door latch assembly signal terminal 4 and ground terminal 6.
* Passenger and RR door latch assembly signal terminal 1 and ground terminal 3.
^ If not the specified value, replace the appropriate door latch assembly.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
* Front Side Door Latch Replacement
* Rear Side Door Latch Replacement