B3145
DTC B3140, B3145, B3150, or B3155
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 B3140 00
- Driver Unlock Switch Circuit
DTC B3145 00
- Passenger Unlock Switch Circuit
DTC B3150 00
- Driver Lock Switch Circuit
DTC B3150 59
- Generic Lock Switch Circuit
DTC B3155 00
- Passenger Lock Switch Circuit
Diagnostic Fault Information
Circuit/System Description
The body control module (BCM) supplies and monitors a reference voltage to the door lock switch through the door lock switch lock/unlock signal circuit. The door lock switch also receives a constant ground source. If a door lock switch is placed in the lock position or unlock position, the reference voltage is taken directly to ground and the BCM detects the drop in voltage on the signal circuit.
Conditions for Running the DTC
The system voltage is 9-16 volts.
Conditions for Setting the DTC
B3140 00 or B3150 00
The BCM detects a short to ground in the driver door lock switch lock or unlock signal circuits.
B3145 00 or B3155 00
The BCM detects a short to ground in the passenger door lock switch or cargo door lock switch lock or unlock signal circuits.
B3150 59
The BCM detects a lock command from the in the passenger door lock switch or cargo door lock switch lock for greater than 2 minutes.
Action Taken When the DTC Sets
The BCM will ignore the command from affected door lock switch and the door lock switch will be inoperative.
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 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
1. Operate the doors to LOCK and UNLOCK by using the S13D door lock switch-driver, each interior door lock knob should move between LOCK and UNLOCK.
• If the doors do not LOCK or UNLOCK, refer to Driver Door Lock Switch Malfunction.
2. Operate the doors to LOCK and UNLOCK by using the S13P door lock switch-passenger, each interior door lock knob should move between LOCK and UNLOCK.
• If the doors do not LOCK or UNLOCK, refer to Passenger/Cargo Door Lock Switch Malfunction.
3. Operate the doors to LOCK and UNLOCK by using the S13A door lock switch-cargo, each interior door lock knob should move between LOCK and UNLOCK.
• If the doors do not LOCK or UNLOCK, refer to Passenger/Cargo Door Lock Switch Malfunction.
Circuit/System Testing
Driver Door Lock Switch Malfunction
1. Ignition OFF, disconnect the harness connector at the S13D door lock switch-driver.
2. Ignition ON, verify the scan tool Driver Door Lock Sw parameter is Inactive.
• If not the specified value, test the signal circuit terminal G for a short to ground. If the circuit tests normal, replace the K9 BCM.
3. Install a 3 A fused jumper wire between the signal circuit terminal G and ground. Verify the scan tool Driver Door Lock Sw parameter is Active.
• If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
4. Verify the scan tool Driver Door Unlock Sw parameter is Inactive.
• If not the specified value, test the signal circuit terminal F for a short to ground. If the circuit tests normal, replace the K9 BCM.
5. Install a 3 A fused jumper wire between the signal circuit terminal F and ground. Verify the scan tool Driver Door Unlock Sw parameter is Active
• If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
6. If all circuits test normal, test or replace the S13D door lock switch-driver.
Passenger/Cargo Door Lock Switch Malfunction
1. Ignition OFF, disconnect the harness connector at the S13A door lock switch-cargo.
2. Disconnect the harness connector at the S13P door lock switch-passenger.
3. Ignition ON, verify the scan tool Psgr Door Lock Sw parameter is Inactive.
• If not the specified value, test the signal circuit terminal G at the S13P door lock switch-passenger for a short to ground. If the circuit tests normal, replace the K9 BCM.
4. Install a 3 A fused jumper wire between the signal circuit terminal G and ground. Verify the scan tool Psgr Door Lock Sw parameter is Active.
• If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
5. Verify the scan tool Psgr Door Unlock Sw parameter is Inactive.
• If not the specified value, test the signal circuit terminal F for a short to ground. If the circuit tests normal, replace the K9 BCM.
6. Install a 3 A fused jumper wire between the signal circuit terminal F and ground. Verify the scan tool Psgr Door Unlock Sw parameter is Active.
• If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
7. Ignition OFF, connect the harness connector at the S13P door lock switch-passenger.
8. Ignition ON, observe the scan tool Psgr Door Lock Sw and Psgr Door Unlock Sw parameters while using theS13P door lock switch-passenger. The each parameter should change between Inactive to Active.
• If a value is always Inactive or always Active, test or replace the S13P door lock switch-passenger.
9. If all circuits test normal, test or replace the S13A door lock switch-cargo.
Component Testing
Door Lock Switch Test
1. Ignition OFF, disconnect the harness connector at the appropriate S13 door lock switch.
2. Test for infinite resistance between the signal terminals and the ground terminal listed below with the switch in the inactive position:
* S13D door lock switch-driver terminal F and A
* S13D door lock switch-driver terminal G and A
* S13P door lock switch-passenger terminal F and A
* S13P door lock switch-passenger terminal G and A
* S13A door lock switch-cargo terminal A and E
* S13A door lock switch-cargo terminal D and E
• If less than the specified value, replace the door lock switch.
3. Test for less than 2 ohm between the signal terminal and the ground terminal listed below with the switch in the lock position:
* S13D door lock switch-driver terminal F and A
* S13P door lock switch-passenger terminal F and A
* S13A door lock switch-cargo terminal A and E
• If greater than the specified value, replace the door lock switch.
4. Test for less than 2 ohm between the signal terminal and the ground terminal listed below with the switch in the unlock position:
* S13D door lock switch-driver terminal G and A
* S13P door lock switch-passenger terminal G and A
* S13A door lock switch-cargo terminal D and E
• If greater than the specified value, replace the door lock switch.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Door Lock Switch Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for BCM replacement, setup, and programming