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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 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

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Driver Door Lock Switch Lock Signal

B3150 00

1

1

--

Driver Door Lock Switch Unlock Signal

B3140 00

2

2

--

Driver Door Lock Switch Ground

--

3

--

--

1. Door Lock Switch Lock Function Inoperative

2. Door Lock Switch Unlock Function Inoperative

3. Door Lock Switch Lock and Unlock Functions Inoperative

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 ground in the unlock signal circuit for greater than 60 seconds.

B3150 00

The BCM detects a short to ground in the 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 lock switch.

B3150 00

The BCM will ignore the lock signal and the doors will not lock when using the driver 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

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 scan tool information

Circuit/System Verification

Ignition ON, observe the scan tool BCM Central Door Lock Switch on Console parameter. The reading should be Inactive and change to Lock and Unlock when pushing the appropriate switch on the driver door lock switch.

Circuit/System Testing
  1. Ignition OFF, disconnect the harness connector at the S13D door lock switch-driver.
  2. Test for less than 10 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.
  3. Ignition ON, verify the scan tool Central Door Lock Switch on Center Console parameter is Inactive.
    4. ⇒If the value is Lock , test the signal circuit terminal 4 for a short to ground. If the circuit tests normal, replace the K9 BCM.
    ⇒If the value is Unlock , test the signal circuit terminal 3 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 4 and ground. Verify the scan tool Central Door Lock Switch on Center Console parameter is Lock.
    5. ⇒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 3 and ground. Verify the scan tool Central Door Lock Switch on Center Console parameter is Unlock.
    6. ⇒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.
    3. ⇒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.
    4. ⇒If not the specified value, replace the S13D door lock switch-driver.
  4. Test for less than 2 Ω between the signal terminal 4 and the ground terminal 1 with the switch in the lock position.
    5. ⇒If greater than the specified range, replace the S13D door lock switch-driver.
  5. Test for less than 2 Ω between the signal terminal 3 and the ground terminal 1 with the switch in the unlock position.
    6. ⇒If greater than the specified range, replace the S13D door lock switch-driver.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Door Lock Switch Replacement
    • Control Module References for BCM replacement, programming and setup
   


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