GM Service Manual Online
For 1990-2009 cars only

Diagnostic Instructions

    â€¢ Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    â€¢ Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    â€¢  Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC B3135 00: All Door Lock Circuit

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Driver Door Module B+

U0199 00

U0199 00

--

--

I/P Fuse Block B+

3, 4

3, 4

--

--

Passenger Door Module B+

U0200 00

U0200 00

--

--

Driver Door Latch Control

1

1

1

--

Passenger Door Latch Control

2

2

2

--

Lock/Unlock PCB Relay Control

B3130 00, B3135 00

B3130 00, B3135 00

B3130 00, B3135 00

--

Rear Door Latch Control

3, 4

3, 4

3, 4

--

I/P Fuse Block Ground

--

3, 4

3, 4

--

1. Driver Door Latch Malfunction

2. Passenger Door Latch Malfunction

3. Rear Door Unlock Inoperative

4. Rear Door Lock Inoperative

Circuit/System Description

The body control module (BCM) energizes the lock relay coil through a high side drive control circuit. When the BCM receives a lock message voltage is supplied to the door lock relay control circuit energizing the lock relay coil.

Conditions for Running the DTC

    â€¢ Battery voltage is between 9-16 volts.
    â€¢ The BCM has attempted to energize the lock relay.

Conditions for Setting the DTC

The BCM has detected a fault in the door lock relay control circuit.

Action Taken When the DTC Sets

The BCM will not attempt lock operation.

Conditions for Clearing the DTC

    â€¢ This DTC will be current for as long as the fault is present.
    â€¢ When the fault is no longer present, the DTC will be a history DTC.
    â€¢ 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

Power Door Locks Description and Operation

Electrical Information Reference

    â€¢  Circuit Testing
    â€¢  Connector Repairs
    â€¢  Testing for Intermittent Conditions and Poor Connections
    â€¢  Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Command the rear doors lock to LOCK and UNLOCK with a scan tool, the doors should perform the LOCK and UNLOCK function.

Circuit/System Testing

  1. Ignition OFF, disconnect the X3 harness connector at the I/P fuse block.
  2. Connect a test lamp between the control circuit terminal A2 and ground.
  3. Ignition ON, command the doors to LOCK with a scan tool, the test lamp should illuminate during the LOCK command.
  4. ⇒If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
    ⇒If the test lamp continuously illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
  5. If the circuit tests normal, replace the I/P fuse block.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    â€¢  Instrument Panel Electrical Center or Junction Block Replacement - Left Side
    â€¢  Control Module References for BCM replacement, programming, and setup