B3140
DTC B3140 or B3150
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 B3150 00
- Driver Lock Switch Circuit
Diagnostic Fault Information
Circuit/System Description
The BCM monitors the voltage level of the door lock and door unlock signal circuits. When the driver door lock switch is in the open position, the voltage level in the signal circuit will be near 0 V. When the driver door lock switch is pressed to the lock or unlock position, a signal will be sent to the BCM requesting a lock or unlock command.
Conditions for Running the DTC
The system voltage is 9-16 V.
Conditions for Setting the DTC
B3140 00
The BCM detects short to voltage in the unlock signal circuit for greater than 60 seconds.
B3150 00
The BCM detects a short to voltage in the lock signal circuit for greater than 60 seconds.
Action Taken When the DTC Sets
The door lock switch will malfunction.
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
Ignition ON, observe the scan tool BCM Driver Door Unlock Switch and Driver Door Lock Switch parameters. The reading should be Inactive and change to Active when pushing the appropriate switch.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the S13D door lock switch-driver.
2. Ignition ON, verify the scan tool Driver Door Unlock Switch parameter is Inactive.
• If not the specified value, test the signal circuit terminal 3 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 3 and ground. Verify the scan tool Driver Door Unlock Switch 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. Ignition ON, verify the scan tool Driver Door Lock Switch parameter is Inactive.
• If not the specified value, test the signal circuit terminal 4 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 4 and ground. Verify the scan tool Driver Door Lock Switch 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, replace the S13D door lock switch-driver.
Component Testing
1. Ignition OFF, disconnect the harness connector at the S13D door lock switch-driver.
2. Test for infinite resistance between the signal terminal 3 and the ground terminal 1 with the switch in the open position.
• If not the specified value, replace the S13D door lock switch-driver.
3. Test for infinite resistance between the signal terminal 4 and the ground terminal 1 with the switch in the open position.
• If not the specified value, replace the S13D door lock switch-driver.
4. Test for less than 2 ohm between the signal terminal 4 and the ground terminal 1 with the switch in the lock position.
• If greater than the specified range, replace the S13D door lock switch-driver.
5. Test for less than 2 ohm between the signal terminal 3 and the ground terminal 1 with the switch in the unlock position.
• If greater than the specified range, replace the S13D door lock switch-driver.
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, programming and setup