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 B3135 00: All Door Lock CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
I/P Fuse Block B+ | 3, 4 | 3, 4 | -- | -- |
Driver Door Latch Control | 1 | 1 | 1 | -- |
Passenger Door Latch Control | 2 | 2 | 2 | -- |
Lock/Unlock PCB Relay Control | B3130 00, B3135 00 | 3, 4 | 3, 4 | -- |
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
| • | Battery voltage is between 9-16 volts. |
| • | The BCM has attempted to energize the lock relay. |
Conditions for Setting the DTC
The door lock relay control circuit is shorted to ground.
Action Taken When the DTC Sets
The rear power door locks will malfunction.
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
Power Door Locks Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Command the Lock Rear Doors and Unlock Rear Doors with a scan tool, the rear doors should perform the LOCK and UNLOCK function.
Circuit/System Testing
- Ignition OFF, disconnect the X3 harness connector at the I/P fuse block.
- Connect a test lamp between the control circuit terminal A2 and ground.
- Ignition ON, command the Lock Rear Doors with a scan tool. The test lamp should briefly illuminate during the LOCK command.
- If all circuits test normal, replace the I/P fuse block.
| ⇒ | If the test lamp is always OFF, 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 is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, programming, and setup |
