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DTC B3125, B3130, or B3135

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 Descriptors

DTC B3125 01: Driver Door Only Unlock Circuit Short to Battery

DTC B3125 02: Driver Door Only Unlock Circuit Short to Ground

DTC B3125 04: Driver Door Only Unlock Circuit Open

DTC B3130 01: All Doors Unlock Circuit Short to Battery

DTC B3130 02: All Doors Unlock Circuit Short to Ground

DTC B3130 04: All Doors Unlock Circuit Open

DTC B3135 01: All Doors Lock Circuit Short to Battery

DTC B3135 02: All Doors Lock Circuit Short to Ground

DTC B3135 04: All Doors Lock Circuit Open

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Door Lock Switch Signal

1, 4

1, 4

1, 4

-

Door Unlock Switch Signal

2, 3, 4

2, 3, 4

2, 3, 4

--

Driver Door Unlock Control

B3125 02, B3130 02, B3135 02

1, 2, 3, 4

1, 2, 3, 4

--

Doors Lock Control

B3125 02, B3130 02, B3135 02

1, 2, 3, 4

1, 2, 3, 4

--

Passenger Doors Unlock Control

B3125 02, B3130 02, B3135 02

1, 2, 3, 4

1, 2, 3, 4

--

Door Lock Switch Ground

-

1, 2, 3, 4

1, 2, 3, 4

--

1. Door Lock Malfunction

2. Driver Door Unlock Malfunction

3. Door Unlock Malfunction

4. Fuel Filler Door Release Inoperative

Circuit/System Description

The body control module (BCM) controls the door lock, passenger door unlock and driver door unlock circuits. Voltage is applied to the appropriate circuit when the BCM senses a door lock/unlock switch activation or a keyless entry lock or unlock command.

Conditions for Running the DTC

The system voltage is 9-18 V.

Conditions for Setting the DTC

B3125 01

The BCM detects a short to battery on the driver door unlock control circuit.

B3125 02

The BCM detects a short to ground on the driver door unlock control circuit.

B3125 04

The BCM detects an open circuit on the driver door unlock control circuit.

B3130 01

The BCM detects a short to battery on the unlock door control circuit.

B3130 02

The BCM detects a short to ground on the unlock door control circuit.

B3130 04

The BCM detects an open circuit on the unlock door control circuit.

B3135 01

The BCM detects a short to battery on the door lock control circuit.

B3135 02

The BCM detects a short to ground on the door lock control circuit.

B3135 04

The BCM detects an open circuit on the door lock control circuit.

Action Taken When the DTC Sets

The power door locks will be inoperative.

Conditions for Clearing the DTC
    • This 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

Power Door Locks Description and Operation

Electrical Information Reference

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

Circuit/System Verification

Command the body control module All Door Lock, Driver Door Unlock and Passenger Door(s) Unlock with the scan tool, the doors should perform the lock and unlock function.

Circuit/System Testing
  1. Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module.
  2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 4 X2 and ground.
    3. ⇒If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the F10DA fuse or the X50A Fuse Block - Under-bonnet.
  3. Ignition OFF, connect the X2 harness connector at the K9 Body Control Module.
  4. Disconnect the A23D Door Catch Assembly - Driver harness connector.
  5. Verify that DTC B3125 02, B3130 02, or B3135 02 does not reset.
    6. ⇒If any listed DTC resets, test or replace the A23D Door Catch Assembly - Driver.
  6. Ignition OFF, disconnect the A23P Door Catch Assembly - Passenger harness connector.
  7. Verify that DTC B3125 02, B3130 02, or B3135 02 does not reset.
    8. ⇒If any listed DTC resets, test or replace the A23P Door Catch Assembly - Passenger.
  8. Ignition OFF, disconnect the A23LR Door Catch Assembly - Left Rear harness connector.
  9. Verify that DTC B3125 02, B3130 02, or B3135 02 does not reset.
    10. ⇒If any listed DTC resets, test or replace the A23LR Door Catch Assembly - Left Rear.
  10. Ignition OFF, disconnect the A23RR Door Catch Assembly - Right Rear harness connector.
  11. Verify that DTC B3125 02, B3130 02, or B3135 02 does not reset.
    12. ⇒If any listed DTC resets, test or replace the A23RR Door Catch Assembly - Right Rear.
  12. Ignition OFF, disconnect the M27 Fuel Door Unlatch Actuator harness connector.
  13. Verify that DTC B3125 02, B3130 02, or B3135 02 does not reset.
    14. ⇒If any listed DTC resets, test or replace the M27 Fuel Door Unlatch Actuator.
  14. Ignition OFF, disconnect the X6 harness connector at the K9 Body Control Module.
  15. Test for infinite resistance between the circuit terminals listed below and ground:
    16. • Control circuit terminal 1 X6
    • Control circuit terminal 2 X6
    • Control circuit terminal 4 X6
    ⇒If less than the specified value, test the control circuit for a short to ground.
  16. If all circuits test normal, replace the K9 Body Control Module

Component Testing

Door Latch Test

  1. Ignition OFF, disconnect the harness connector at the appropriate door latch assembly.
  2. Install a 25 A fused jumper wire between the lock control terminal and B+. Momentarily install a jumper wire between the unlock control terminal and ground. The door catch assembly should perform the lock/unlock function.
    3. ⇒If the function does not perform as specified, replace the door latch assembly.
  3. Reverse the jumper wires; the appropriate door lock should perform the unlock/lock function.
    4. ⇒If the function does not perform as specified, replace the door latch assembly.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Relay Replacement : Within an Electrical Center → Attached to Wire Harness
    •  Front Side Door Catch Replacement
    •  Rear Side Door Catch Replacement
    • Control Module References for BCM replacement, setup and programming
   


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