B3130
DTC B3125, B3130, or B3135
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions 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 Short 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/System Description
The body control module (BCM) controls the driver and passenger door latches. When the BCM receives a driver door unlock, passenger door unlock or all door lock command, it will provide voltage to the appropriate door lock circuits and ground to the opposite door lock circuits causing the actuator to perform the lock or unlock function.
Conditions for Running the DTC
Ignition ON.
Conditions for Setting the DTC
B3125 01, B3130 01, B3135 01
The BCM detects a short to battery on a door latch control circuit
B3125 02, B3130 02 and B3135 02
* A short to ground or an open/high resistance in the BCM B+ circuit.
* The BCM detects a short to ground on a door latch control circuit.
B3125 04, B3130 04, B3135 04
The BCM detects an open/high resistance on a door latch control circuit
Action Taken When the DTC Sets
All 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 Door Lock/Indicator Schematics
Body Control System Schematics [1][2]Body Control Systems
Connector End View Reference
Component Connector End Views Sunshade - Left (D6I)
Description and Operation
Power Door Locks Description and Operation Description and Operation
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
Command the doors to LOCK and UNLOCK by using the driver door lock switch, all the doors should LOCK and UNLOCK when changing between the commanded states.
If the driver door does not LOCK or UNLOCK, refer to Driver Door Lock Malfunction.
If one or more passenger doors do not LOCK or UNLOCK, refer to Passenger Door Lock Malfunction.
If all doors do not LOCK and UNLOCK, refer to All Door Locks Inoperative.
Circuit/System Testing
Driver Door Lock Malfunction
1. Ignition OFF, disconnect the harness connector at the A23D door latch assembly-driver.
2. Connect a test lamp between the control circuit terminal 2 and the control circuit terminal 3
3. Command the driver door latch to LOCK and UNLOCK with a scan tool, the test lamp should illuminate when commanding the LOCK and UNLOCK states.
• If the test lamp is OFF during either of the LOCK and UNLOCK commands, test the either control circuit for an open/high resistance. If the circuits test normal, replace the K9 BCM
• If the test lamp always ON , test the either control circuit for a short to voltage. If the circuits test normal, replace the K9 BCM
4. If all circuits test normal, test or replace the A23D door latch assembly-driver
Passenger Door Lock Malfunction
1. Ignition OFF, disconnect the harness connector at the appropriate A23 door latch assembly.
2. Connect a test lamp between the control circuit terminals listed below:
* A23P door latch assembly-passenger control circuit terminal 7 and control circuit terminal 8
* A23RR door latch assembly-right rear control circuit terminal 7 and control circuit terminal 8
* A23LR door latch assembly-left rear control circuit terminal 2 and control circuit terminal 3
3. Command the door to LOCK and UNLOCK with a scan tool, the test lamp should illuminate when commanding the LOCK and UNLOCK states.
• If the test lamp is OFF during either of the LOCK and UNLOCK commands, test the either control circuit for an open/high resistance. If the circuits test normal, replace the K9 BCM
• If the test lamp always ON , test the either control circuit for a short to voltage. If the circuits test normal, replace the K9 BCM
4. If all circuits test normal, test or replace the A23 door latch assembly
All Door Locks Inoperative
1. Ignition OFF, disconnect the X2 harness connector at the K9 BCM.
2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 4 and ground.
• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
3. Ignition OFF, connect the X2 harness connector and disconnect the X6 harness connector at the K9 BCM.
4. Test for infinite resistance between each control circuit listed below and ground:
* Control circuit terminal 1
* Control circuit terminal 2
* Control circuit terminal 4
• If not the specified value, disconnect the A23 door latch assemblies and test each control circuit for a short to ground. If the circuits test normal, test for an internally shorted A23 door latch assembly.
5. If all circuits test normal, replace the K9 BCM.
Component Testing
Door Latch Test
1. Ignition OFF, disconnect the harness connector at the appropriate A23 door latch assembly.
2. Install a 15 A fused jumper wire between one of the control terminals and 12 V. Momentarily install a jumper wire between the other control terminal and ground. Reverse the jumper wires at least two times, the A23 door latch assembly should perform the LOCK and UNLOCK functions.
• If it does not perform as specified, replace the appropriate A23 door latch assembly
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Front Side Door Latch Replacement Service and Repair
* Rear Side Door Latch Replacement Service and Repair
* Fuse Block Replacement Fuse Block Replacement
* Control Module References Control Module References for BCM replacement, programming and setup