For 1990-2009 cars only
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 B3130 00: All Door Unlock CircuitCircuit/System Description
The body control module (BCM) energizes the unlock relay coil through a low side drive control circuit. When the BCM receives an unlock message the door unlock control circuit is grounded energizing the unlock relay coil.
Conditions for Running the DTC
| • | Battery voltage is between 9-16 volts. |
| • | The BCM has attempted to energize the unlock relay. |
Conditions for Setting the DTC
The door unlock control circuit is shorted to voltage.
Action Taken When the DTC Sets
The BCM will not attempt unlock operation.
Conditions for Clearing the DTC
| • | When the output request is not active the DTC will be a history status code. |
| • | The history code will clear after 50 fault free ignition cycles or by using the scan tool clear DTCs feature. |
Reference Information
Schematic Reference
Door Lock/Indicator Schematics
Connector End View Reference
Vehicle Access Connector End Views
Description and Operation
Power Door Locks Description and Operation
Electrical Information Reference
Scan Tool Reference
Circuit/System Testing
- Disconnect the BCM connector C7 and connect a test lamp from terminal 9 to ground.
- Ignition ON, verify that the test lamp does not illuminate.
- If the circuits test normal replace the BCM.
| ⇒ | If the test lamp illuminates test the door unlock control circuit for a short to voltage. If the circuit tests normal replace the IP fuse block. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, programming, and setup. |
