B3140
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 B3145 00
- Passenger Door Unlock Switch Circuit
DTC B3150 00
- Left Front Door Lock Switch Circuit
DTC B3155 00
- Right Front Door Lock Switch Circuit
Diagnostic Fault Information
Circuit/System Description
The body control module (BCM) supplies a 12 V signal to each of the door lock and door unlock signal circuits. When the door lock switches are in the open position, the voltage level in the signal circuit will be near 12 V. When any 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 driver unlock signal circuit for greater than 60 seconds.
B3145 00
The BCM detects short to ground in the passenger/central unlock signal circuit for greater than 60 seconds.
B3150 00
The BCM detects a short to ground in the driver lock signal circuit for greater than 60 seconds.
B3155 00
The BCM detects a short to ground in the passenger/central lock signal circuit for greater than 60 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 driver door unlock switch.
B3145 00
The BCM will ignore the unlock signal and the doors will not unlock when using the central or passenger door unlock switches.
B3150 00
The BCM will ignore the lock signal and the doors will not lock when using the driver door lock switch.
B3155 00
The BCM will ignore the lock signal and the doors will not lock when using the central or passenger door lock switches.
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 Front
Description and Operation
Power Door Locks Description and Operation Description and Operation
Electrical Information Reference
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Circuit Testing Circuit Testing
* Wiring Repairs Wiring Repairs
* Connector Repairs Connector Repairs
Scan Tool Reference
Control Module References Programming and Relearning for scan tool information
Circuit/System Verification
1. Ignition ON.
2. Verify door latches LOCK and UNLOCK when pushing the appropriate switch on the driver door switch.
• If the door latches do not LOCK or UNLOCK
Refer to Circuit/System Testing - Driver Door Lock Switch Malfunction.
• If the door latches LOCK or UNLOCK
3. Verify the scan tool BCM Central Door Lock Switch on Console parameter changes from Inactive to Lock and Unlock when pushing the appropriate switch on the passenger door lock switch.
• If the value is always Inactive
Refer to Circuit/System Testing - Passenger Door Lock Switch Malfunction.
• If the value changes from Inactive to Lock only
Refer to Circuit/System Testing - Passenger Door Lock Switch Malfunction.
• If the value changes from Inactive to Unlock only
Refer to Circuit/System Testing - Passenger Door Lock Switch Malfunction.
• If the value is always Lock or Unlock
Refer to Circuit/System Testing - Lock and Unlock Circuit Test.
• If the parameter changes
4. Verify the scan tool BCM Central Door Lock Switch on Console parameter changes from Inactive to Lock and Unlock when pushing the appropriate switch on the central door lock switch.
• If the value is always Inactive
Refer to Circuit/System Testing - Central Door Lock Switch Malfunction.
• If the value changes from Inactive to Lock only
Refer to Circuit/System Testing - Central Door Lock Switch Malfunction.
• If the value changes from Inactive to Unlock only
Refer to Circuit/System Testing - Central Door Lock Switch Malfunction.
• If the value is always Lock or Unlock
Refer to Circuit/System Testing - Lock and Unlock Circuit Test.
• If the parameter changes
5. All OK.
Circuit/System Testing
Driver Door Lock Switch Malfunction
1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S13D door lock switch-driver. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 4 and ground.
• If 10 ohms or greater
1. Ignition OFF.
2. Test for less than 2 ohms in the ground circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.
• If less than 10 ohms
3. Ignition ON.
4. Test for greater than 10 V between the signal circuit terminal 2 and ground.
• If 10 V or less
1. Ignition OFF, disconnect the harness connector at the K9 body control module.
2. Test for infinite resistance between the signal circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
3. Test for less than 2 ohms in the signal circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 body control module.
• If greater than 10 V
5. Test for greater than 10 V between the signal circuit terminal 3 and ground.
• If 10 V or less
1. Ignition OFF, disconnect the harness connector at the K9 body control module.
2. Test for infinite resistance between the signal circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
3. Test for less than 2 ohms in the signal circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 body control module.
• If greater than 10 V
6. Test or replace the S13D door lock switch-driver.
Passenger Door Lock Switch Malfunction
1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S13P door lock switch-passenger. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 4 and ground.
• If 10 ohms or greater
1. Ignition OFF.
2. Test for less than 2 ohms in the ground circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.
• If less than 10 ohms
3. Ignition ON.
4. Test for greater than 10 V between the signal circuit terminal 2 and ground.
• If 10 V or less
1. Ignition OFF, disconnect the harness connector at the K9 body control module.
2. Test for infinite resistance between the signal circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
3. Test for less than 2 ohms in the signal circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 body control module.
• If greater than 10 V
5. Test for greater than 10 V between the signal circuit terminal 3 and ground.
• If 10 V or less
1. Ignition OFF, disconnect the harness connector at the K9 body control module.
2. Test for infinite resistance between the signal circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
3. Test for less than 2 ohms in the signal circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 body control module.
• If greater than 10 V
6. Test or replace the S13P door lock switch-passenger.
Central Door Lock Switch Malfunction
1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the A20 radio/HVAC controls. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 17 and ground.
• If 10 ohms or greater
1. Ignition OFF.
2. Test for less than 2 ohms in the ground circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.
• If less than 10 ohms
3. Ignition ON.
4. Test for greater than 10 V between the signal circuit terminal 12 and ground.
• If 10 V or less
1. Ignition OFF, disconnect the harness connector at the K9 body control module.
2. Test for infinite resistance between the signal circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
3. Test for less than 2 ohms in the signal circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 body control module.
• If greater than 10 V
5. Test for greater than 10 V between the signal circuit terminal 13 and ground.
• If 10 V or less
1. Ignition OFF, disconnect the harness connector at the K9 body control module.
2. Test for infinite resistance between the signal circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
3. Test for less than 2 ohms in the signal circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 body control module.
• If greater than 10 V
6. Test or replace the A20 radio/HVAC controls.
Lock and Unlock Circuit Test
1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the A20 radio/HVAC controls.
2. Disconnect the harness connector at the S13P door lock switch-passenger.
3. Ignition ON.
4. Verify the scan tool Central Door Lock Switch on Console parameter is Inactive.
• If not Inactive
1. Ignition OFF, disconnect the X2 harness connector at the K9 body control module.
2. Test for infinite resistance between the signal circuit terminal 15 and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
3. Test for infinite resistance between the signal circuit terminal 19 and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the K9 body control module.
• If Inactive
5. Connect the harness connector at the S13P door lock switch-passenger.
6. Verify the scan tool BCM Central Door Lock Switch on Console parameter changes from Inactive to Lock and Unlock when pushing the appropriate switch on the passenger door lock switch.
• If the value is always Lock or Unlock
1. Test or replace the S13P door lock switch-passenger.
• If the value changes from Inactive to Lock and Unlock
7. Connect the harness connector at the A20 radio/HVAC controls.
8. Verify the scan tool BCM Central Door Lock Switch on Console parameter changes from Inactive to Lock and Unlock when pushing the appropriate switch on the central door lock switch.
• If the value is always Lock or Unlock
1. Test or replace the A20 radio/HVAC controls.
• If the value changes from Inactive to Lock and Unlock
9. All OK.
Component Testing
Driver Door Lock Switch
1. Ignition OFF, disconnect the harness connector at the S13D door lock switch-driver.
2. Test for infinite resistance between the signal terminal 2 and the ground terminal 4 with the switch in the open position.
• If less than infinite resistance
Replace the S13D door lock switch-driver.
• If infinite resistance
3. Test for infinite resistance between the signal terminal 3 and the ground terminal 4 with the switch in the open position.
• If less than infinite resistance
Replace the S13D door lock switch-driver
• If infinite resistance
4. Test for less than 2 ohms between the signal terminal 2 and the ground terminal 4 with the switch in the Lock position.
• If 2 ohms or greater
Replace the S13D door lock switch-driver.
• If less than 2 ohms
5. Test for less than 2 ohms between the signal terminal 3 and the ground terminal 4 with the switch in the Unlock position.
• If 2 ohms or greater
Replace the S13D door lock switch-driver.
• If less than 2 ohms
6. All OK
Passenger Door Lock Switch
1. Ignition OFF, disconnect the harness connector at the S13P door lock switch-passenger.
2. Test for infinite resistance between the signal terminal 2 and the ground terminal 4 with the switch in the open position.
• If less than infinite resistance
Replace the S13P door lock switch-passenger.
• If infinite resistance
3. Test for infinite resistance between the signal terminal 3 and the ground terminal 4 with the switch in the open position.
• If less than infinite resistance
Replace the S13P door lock switch-passenger
• If infinite resistance
4. Test for less than 2 ohms between the signal terminal 2 and the ground terminal 4 with the switch in the Lock position.
• If 2 ohms or greater
Replace the S13P door lock switch-passenger.
• If less than 2 ohms
5. Test for less than 2 ohms between the signal terminal 3 and the ground terminal 4 with the switch in the Unlock position.
• If 2 ohms or greater
Replace the S13P door lock switch-passenger.
• If less than 2 ohms
6. All OK
Central Door Lock Switch
1. Ignition OFF, disconnect the harness connector at the A20 radio/HVAC controls.
2. Test for infinite resistance between the signal terminal 12 and the ground terminal 17 with the switch in the open position.
• If less than infinite resistance
Replace the A20 radio/HVAC controls.
• If infinite resistance
3. Test for infinite resistance between the signal terminal 13 and the ground terminal 17 with the switch in the open position.
• If less than infinite resistance
Replace the A20 radio/HVAC controls
• If infinite resistance
4. Test for less than 2 ohms between the signal terminal 12 and the ground terminal 17 with the switch in the Lock position.
• If 2 ohms or greater
Replace the A20 radio/HVAC controls.
• If less than 2 ohms
5. Test for less than 2 ohms between the signal terminal 13 and the ground terminal 17 with the switch in the Unlock position.
• If 2 ohms or greater
Replace the A20 radio/HVAC controls.
• If less than 2 ohms
6. All OK
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Door Lock Switch Replacement - Driver Side Door Lock Switch Replacement - Driver Side
* Door Lock Switch Replacement - Passenger Front Door Lock Switch Replacement - Passenger Front
* Control Module References Programming and Relearning BCM and HVAC control replacement, programming and setup