B3135
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 B3130 01
- All Doors Unlock Circuit Short to Battery
DTC B3130 02
- All Doors Unlock Circuit Short to Ground
DTC B3135 01
- All Doors Lock Circuit Short to Battery
DTC B3135 02
- All Doors Lock Circuit Short to Ground
Diagnostic Fault Information
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 9-16 V.
Conditions for Setting the DTC
B3125 01, B3130 01, B3135 02
The BCM detects a short to battery on a door latch control circuit
B3125 02, B3130 02, B3135 02
The BCM detects a short to ground on a door latch control circuit.
Action Taken When the DTC Sets
All 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 (Door Lock/Indicator Schematics)
Connector End View Reference
Component Connector End Views (Connector End Views By Name)
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 (Programming and Relearning) for scan tool information
Circuit/System Verification
Ignition ON, command the doors to LOCK and UNLOCK by using the central door lock switch, all doors should LOCK and UNLOCK while changing between the commanded states.
Circuit/System Testing
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. If the circuit tests normal and the B+ circuit fuse is open, replace the K9 BCM.
3. Ignition OFF, disconnect the X6 harness connector at the K9 BCM.
4. Disconnect the X2 and X3 harness connectors at the X53 fuse block-rear
5. Test for 5-20 ohm between the control circuit terminal 4 X6 at the K9 BCM and control circuit terminal 36 X2 at the X53 fuse block-rear.
• If less than the specified range, test either control circuit for a short to ground. If the circuits test normal, test or replace the appropriate A23 door latch assembly.
• If greater than the specified range, test either control circuit for a short to voltage or an open/high resistance. If the circuits test normal, test or replace the appropriate A23 door latch assembly.
6. Test for 5-20 ohm between the control circuit terminal 4 X6 at the K9 BCM and control circuit terminal 28 X2 at the X53 fuse block-rear.
• If less than the specified range, test either control circuit for a short to ground. If the circuits test normal, test or replace the appropriate A23 door latch assembly.
• If greater than the specified range, test either control circuit for a short to voltage or an open/high resistance. If the circuits test normal, test or replace the appropriate A23 door latch assembly.
7. Test for 5-20 ohm between the control circuit terminal 4 X6 at the K9 BCM and control circuit terminal 16 X3 at the X53 fuse block-rear.
• If less than the specified range, test either control circuit for a short to ground. If the circuits test normal, test or replace the A23D door latch assembly-driver.
• If greater than the specified range, test either control circuit for a short to voltage or an open/high resistance. If the circuits test normal, test or replace the A23D door latch assembly-driver.
8. Test for 5-20 ohm between the control circuit terminal 4 X6 at the K9 BCM and control terminal 17 X3 at the X53 fuse block-rear (If equipped).
• If less than the specified range, test either control circuit for a short to ground. If the circuits test normal, test or replace the appropriate A23 door latch assembly.
• If greater than the specified range, test either control circuit for a short to voltage or an open/high resistance. If the circuits test normal, test or replace the appropriate A23 door latch assembly.
9. Test for 5-20 ohm between the control circuit terminal 2 and control circuit terminal 4 at the K9 BCM.
• If less than the specified range, test either control circuit for a short to ground. If the circuits test normal, replace the X53 fuse block-rear.
• If greater than the specified range, test either control circuit for a short to voltage or an open/high resistance. If the circuits test normal, replace the X53 fuse block-rear.
10. Test for 5-20 ohm between the control circuit terminal 1 and control circuit terminal 4 at the K9 BCM.
• If less than the specified range, test either control circuit for a short to ground. If the circuits test normal, replace the X53 fuse block-rear.
• If greater than the specified range, test either control circuit for a short to voltage or an open/high resistance. If the circuits test normal, replace the X53 fuse block-rear.
11. If all circuits test normal, replace the K9 BCM.
Component Testing
1. Ignition OFF, disconnect the harness connector at the appropriate A23 door latch assembly.
2. Install a 25 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 A23 door latch assembly.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Front Side Door Lock Replacement (Front Side Door Lock Replacement)
* Rear Side Door Lock Replacement (Rear Side Door Lock Replacement)
* Fuse Block Replacement (Fuse Block Replacement)
* Control Module References (Programming and Relearning) for BCM replacement, setup, and programming