B2976
DTC B2976
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC B2976 00
- Driver Door Ajar Circuit
Diagnostic Fault Information
Circuit/System Description
The body control module (BCM) receives a discrete input from each of the 4 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 9-16 volts.
Conditions for Setting the DTC
The BCM detects a short to ground in the driver door ajar circuit for longer than 10 minutes.
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.
Reference Information
Schematic Reference
Door Lock/Indicator Schematics (Door Lock/Indicator Schematics)
Connector End View Reference
Component Connector End Views (Connector End Views By Name)
Description and Operation
Door Ajar Indicator Description and Operation (Description and Operation)
Electrical Information Reference
* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
Ignition ON, observe the scan tool Driver Door Ajar Sw parameter while opening and closing the driver door. The parameter should change between Door Closed and Door Ajar.
Circuit/System Testing
1. Ignition OFF, disconnect harness connector at the driver door lock.
2. Ignition ON, verify the scan tool Driver Door Ajar Sw parameter is 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.
* Signal circuit terminal 4 (Base)
* Signal circuit terminal 6 (Uplevel)
3. If all circuits test normal, test or replace driver door lock.
Component Testing
1. Ignition OFF, disconnect the harness connector at the driver door lock.
2. With the switch in the open position, test for infinite resistance between the signal terminal and the ground terminal listed below:
* Signal terminal 6 and ground terminal 8 (Uplevel).
* Signal terminal 4 and ground terminal 6 (Base).
• If not the specified value, replace the appropriate door lock.
3. With the switch in the closed position, test for less than 2 ohms between the signal terminal and the ground terminal listed below:
* Signal terminal 6 and ground terminal 8 (Uplevel).
* Signal terminal 4 and ground terminal 6 (Base).
• If greater than the specified range, replace the driver door lock.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Front Side Door Lock Replacement (Front Side Door Lock Replacement)
* Control Module References (Programming and Relearning) for BCM replacement, setup, and programming