GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2009 🢒 CTS 🢒 Safety and Security 🢒 Supplemental Inflatable Restraints 🢒 DTC B2996 or B3001

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 B2996 00: Left Rear Door Ajar Circuit

DTC B3001 00: Right Rear Door Ajar Circuit

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Left Front Door Ajar Switch Signal

1

2

2

--

Left Rear Door Ajar Switch Signal

B2996 00

2

2

--

Right Front Door Ajar Switch Signal

1

2

2

--

Right Rear Door Ajar Switch Signal

B3001 00

2

2

--

Driver Door Latch Ground

--

2

2

--

LR Door Latch Ground

--

2

2

--

Passenger Door Latch Ground

--

2

2

--

RR Door Latch Ground

--

2

2

--

1. Door Ajar Indicator Always Illuminated

2. Door Ajar Indicator Inoperative

Circuit/System Description

The body control module (BCM) monitors the rear door ajar circuits to indicate the status of the rear doors. When the respective door is opened, the door ajar signal circuit is switched to ground by the door lock ajar indicator switch, the BCM detects the drop in voltage in the circuit and 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 when the transaxle is shifted out of PARK, the DIC will also send a serial data message to the radio to activate the door ajar audible warning.

Conditions for Running the DTC

The system voltage is 9-18 volts.

Conditions for Setting the DTC

The BCM detects a short to ground in a rear door ajar circuit for longer than 10 minutes.

Action Taken When the DTC Sets

The appropriate door ajar indicator is continuously illuminated.

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 be a history DTC.
    • A history DTC will clear after 50 ignition cycles.

Reference Information

Schematic Reference

Door Lock/Indicator Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Luggage Compartment Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

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

Circuit/System Testing
  1. Ignition OFF, disconnect the harness connector at the appropriate rear door ajar switch.
  2. Ignition ON, verify the scan tool Right Rear Door Ajar Sw. or Left Rear Door Ajar Sw. parameter is Door Closed.
    3. ⇒If not the specified value, test the signal circuit terminal listed below for a short to ground:
    • LR door latch switch terminal 4
    • RR door latch switch terminal 1
    ⇒If the circuit tests normal, replace the BCM.
  3. If all circuits test normal, test or replace the door ajar switch.

Component Testing
  1. Ignition OFF, disconnect the harness connector at the appropriate door ajar switch.
  2. Test for infinite resistance between the signal terminal and the ground terminal with the door ajar switch in the open position listed below:
    3. • LR door latch switch terminal 4 and 6
    • RR door latch switch terminal 1 and 3
    ⇒If not the specified value, replace the door ajar switch.
  3. Test for less than 2 ohms between the signal terminal and the ground terminal with the door ajar switch in the closed position listed below:
    4. • LR door latch switch terminal 4 and 6
    • RR door latch switch terminal 1 and 3
    ⇒If greater than the specified range, replace the door ajar switch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Rear Side Door Latch Replacement
    •  Control Module References for BCM replacement, setup and programming