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DTC B3140 or B3150

DTC B3140 or B3150

Diagnostic Instructions


• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions has overviews of all diagnostic categories.


DTC Descriptors

DTC B3140 00

Driver Door Unlock Switch Circuit Malfunction

DTC B3150 00

Left Front Door Lock Switch Circuit Malfunction

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Door Lock Switch Signal

B3150 00

B3150 00

B3150 00

-

Door Unlock Switch Signal

B3140 00

B3140 00

B3140 00

-

Driver Door Unlock Control

B3125 02, B3130 02, B3135 02

1, 2

1, 2

-

Doors Lock Control

B3125 02, B3130 02, B3135 02

1, 2, 3

1, 2, 3

-

Passenger Doors Unlock Control

B3125 02, B3130 02, B3135 02

1, 3

1, 3

-

Doors Dead Lock Control

B3797 02

1, 2, 3

1, 2, 3

-

Door Lock Switch Ground

-

1, 2, 3

1, 2, 3

-

1. Door Lock Malfunction

2. Driver Door Unlock Malfunction

3. Door Unlock Malfunction



Circuit/System Description

The door lock switch sends a ground signal to the body control module (BCM) whenever the door lock or door unlock switch is activated. 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

Battery voltage must be between 9-16 V.

Conditions for Setting the DTC

B3140 00

The BCM detects a short to ground in the door lock switch unlock signal circuit for 35 s.

B3150 00

The BCM detects a short to ground in the door lock switch lock signal circuit for 35 s.

Action Taken When the DTC Sets


• The BCM stores the DTC to memory.

• The power door locks will be inoperative.


Conditions for Clearing the DTC


• This DTC will change from current to history when the fault is no longer present.

• A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.


Reference Information

Schematic Reference

Door Lock/Indicator Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Power Door Locks Description and Operation

Electrical Information Reference


• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs


Scan Tool Reference

Control Module References for information on diagnostic tools

Circuit/System Verification

Ignition ON, observe the BCM scan tool All Doors Lock Command, Driver Door Unlock Command and Passenger Door(s) Unlock Command parameters while using the door lock switch. The reading should change between Inactive and Active.

Circuit/System Testing


1. Ignition OFF, disconnect the harness connector at the S48A Multifunction Switch - Instrument Panel.

2. Test for less than 5 Ω between the ground circuit terminal 1 and ground.

3. If greater than the specified range, test the ground circuit for an open/high resistance.

4. Ignition ON, verify the scan tool Central Door Lock Switch on Center Console parameter is Inactive.

5. If not the specified value, test the signal circuit terminals 7 and 9 for a short to ground. If the circuit tests normal, replace the K9 Body Control Module.

6. Install a 3 A fused jumper wire between the signal circuit terminal 7 and ground. Verify the scan tool Central Door Lock Switch on Center Console parameter is Lock.

7. If not the specified value, test the signal circuit an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.

8. 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.

9. If not the specified value, test the signal circuit an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.

10. If all circuits test normal, test or replace the S48A Multifunction Switch - Instrument Panel.


Component Testing


Door Lock Switch Test

1. Ignition OFF, disconnect the harness connector at the S48A Multifunction Switch - Instrument Panel.

2. Test for infinite resistance between the signal terminals 9 and 7 and the ground terminal 1 with the switch in the released position.

3. If less than the specified value, replace the S48A Multifunction Switch - Instrument Panel.

4. Test for less than 5 Ω between the signal terminal 7 and the ground terminal 1 with the switch in the lock position.

5. If greater than the specified range, replace the S48A Multifunction Switch - Instrument Panel.

6. Test for less than 5 Ω between the signal terminal 9 and the ground terminal 1 with the switch in the unlock position.

7. If greater than the specified range, replace the S48A Multifunction Switch - Instrument Panel.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Front Compartment Fuse Block Housing Replacement

• Control Module References for BCM replacement, setup and programming.