Power Door Lock Switch Malfunction
Power Door Lock Switch Malfunction - 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 Door Unlock Switch Circuit
DTC B3150 00
-
Left Front Door Lock Switch Circuit
Diagnostic Fault Information
Circuit/System Description
The body control module (BCM) monitors the voltage level of the door lock and door unlock signal circuits. When the central door lock switch is in the open position, the voltage level in the signal circuit will be near 12 V. When the central door lock switch is pressed to the lock or unlock position, the voltage level in the appropriate signal circuit will drop to 0 V and the BCM will detect the voltage drop and command the door latches to perform the requested 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 ground in the unlock signal circuit for greater than 30 seconds.
B3150 00
The BCM detects a short to ground in the lock signal circuit for greater than 30 seconds.
Action Taken When the DTC Sets
B3140 00
The BCM will ignore the unlock signal and the doors will not unlock when using the central door lock switch.
B3150 00
The BCM will ignore the lock signal and the doors will not lock when using the central door lock switch.
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 Sunshade - Left (DH6)
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
Ignition ON, observe the scan tool BCM Central Door Lock Switch on Console parameter. The value should be Inactive and change to Lock and Unlock when pushing the appropriate switch on the central door lock switch.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the S48C multifunction switch 1-instrument panel.
2. Test for less than 10 ohms between the ground circuit terminal 7 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify the scan tool Central Door Lock Switch on Center Console parameter is Inactive.
• If the value is Lock , test the signal circuit terminal 11 for a short to ground. If the circuit tests normal, replace the K9 BCM.
• If the value is Unlock , test the signal circuit terminal 9 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 11 and ground. Verify the scan tool Central Door Lock Switch on Center Console parameter is Lock.
• 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. Install a 3 A fused jumper wire between the signal circuit terminal 9 and ground. Verify the scan tool Central Door Lock Switch on Center Console parameter is Unlock.
• 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 S48C multifunction switch 1-instrument panel.
Component Testing
Door Lock Switch Test
1. Ignition OFF, disconnect the harness connector at the S48C multifunction switch 1-instrument panel.
2. Test for infinite resistance between the signal terminal 9 and the ground terminal 7 with the switch in the open position.
• If not the specified value, replace the S48C multifunction switch 1-instrument panel.
3. Test for infinite resistance between the signal terminal 11 and the ground terminal 7 with the switch in the open position
• If not the specified value, replace the S48C multifunction switch 1-instrument panel.
4. Test for less than 2 ohms between the signal terminal 11 and the ground terminal 7 with the switch in the LOCK position.
• If greater than the specified range, replace the S48C multifunction switch 1-instrument panel.
5. Test for less than 2 ohms between the signal terminal 9 and the ground terminal 7 with the switch in the UNLOCK position.
• If greater than the specified range, replace the S48C multifunction switch 1-instrument panel.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Hazard Warning and Accessory Switch Replacement Service and Repair
* Control Module References Control Module References for the BCM replacement, programming and setup