B2991
DTC B2991
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
DTC Descriptor
DTC B2991 00
- Passenger Door Ajar Circuit
Diagnostic Fault Information
Circuit/System Description
The body control module (BCM) receives a discrete input from driver and passenger jamb switches. 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 illuminate the door ajar indicator 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 a passenger door ajar circuit for longer than 10 minutes.
Action Taken When the DTC Sets
The passenger door 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 Views)
Description and Operation
Door Ajar Indicator Description and Operation (Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
Ignition ON, with all doors closed, observe the scan tool Passenger Door Ajar Sw. parameter while opening and closing the passenger doors. The parameter should change between Door Closed and Door Ajar.
Circuit/System Testing
1. Ignition OFF, disconnect harness connector at the appropriate door latch.
2. Ignition ON, verify the scan tool Passenger 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.
* Passenger door latch signal circuit terminal 1
* Left rear door latch signal circuit terminal 4
* Right rear door latch signal circuit terminal 4
3. If all circuit tests normal, test or replace the door latch.
Component Testing
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:
* Front passenger door latch signal terminal 1 and ground terminal 3
* Left rear door latch signal terminal 4 and ground terminal 6
* Right rear door latch signal terminal 4 and ground terminal 6
• If not the specified value, replace the door latch.
3. With the switch in the closed position, test for less than 1.0 ohm between the signal terminal and the ground terminal listed below:
* Front passenger door latch signal terminal 1 and ground terminal 3
* Left rear door latch signal terminal 4 and ground terminal 6
* Right rear door latch signal terminal 4 and ground terminal 6
• If not the specified value, replace the door latch.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Front Side Door Latch Replacement (Service and Repair)
* Rear Side Door Latch Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for BCM replacement, setup, and programming