Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC B2991 00: Passenger Door Ajar CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Driver Door Ajar Signal | B2976 00 | 1 | 1 | -- |
Passenger Door Ajar Signal | B2991 00 | 1 | 1 | -- |
Driver Door Latch Ground | -- | 1 | 1 | -- |
Left Rear Door Latch Ground | -- | 1 | 1 | -- |
Passenger Door Latch Ground | -- | 1 | 1 | -- |
Right Rear Door Latch Ground | -- | 1 | 1 | -- |
1. Door Ajar Indicator Malfunction | ||||
Circuit/System Description
The body control module (BCM) receives a discrete input from ajar switches within driver and passenger door latches. 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 ajar icon in the driver information center (DIC) and also send a serial data massage to the radio to activate the door ajar audible warning when the engine has been started and the gear selector is moved from the P (park) position.
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 greater than 10 minutes.
Action Taken When the DTC Sets
The 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
Connector End View Reference
Description and Operation
Door Ajar Indicator Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Ignition ON, with all doors closed, observe the scan tool Passenger Door Ajar Switch. parameter while opening and closing the passenger and rear doors. The parameter should change between Door Closed and Door Ajar.
Circuit/System Testing
- Ignition OFF, disconnect harness connector at the appropriate passenger or rear door latch.
- Ignition ON, verify the scan tool Passenger Door Ajar Switch parameter is Door Closed.
- If all circuit tests normal, test or replace the door latch.
| ⇒ | 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 1 |
Component Testing
- Ignition OFF, disconnect the harness connector at the appropriate door latch.
- With the switch in the open position, test for infinite resistance between the signal terminal and the ground terminal listed below:
- With the switch in the closed position, test for less than 2 ohms between the signal and the ground terminals listed below:
| • | Passenger door latch signal terminal 1 and ground terminal 3 |
| • | Right rear door latch signal terminal 1 and ground terminal 3 |
| • | Left rear door latch signal terminal 4 and ground terminal 6 |
| ⇒ | If not the specified value, replace the door latch. |
| • | Passenger door latch signal terminal 1 and ground terminal 3 |
| • | Right rear door latch signal terminal 1 and ground terminal 3 |
| • | Left 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 after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, setup and programming |
