B3145

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 Unlock Switch Circuit

DTC B3145 00
- Passenger Unlock Switch Circuit

DTC B3150 00
- Driver Lock Switch Circuit

DTC B3150 59
- Generic Lock Switch Circuit

DTC B3155 00
- Passenger Lock Switch Circuit

Diagnostic Fault Information






Circuit/System Description

The body control module (BCM) supplies and monitors a reference voltage to the door lock switch through the door lock switch lock/unlock signal circuit. The door lock switch also receives a constant ground source. If a door lock switch is placed in the lock position or unlock position, the reference voltage is taken directly to ground and the BCM detects the drop in voltage on the signal circuit.

Conditions for Running the DTC

The system voltage is 9-16 volts.

Conditions for Setting the DTC

B3140 00 or B3150 00

The BCM detects a short to ground in the driver door lock switch lock or unlock signal circuits.

B3145 00 or B3155 00

The BCM detects a short to ground in the passenger door lock switch or cargo door lock switch lock or unlock signal circuits.

B3150 59

The BCM detects a lock command from the in the passenger door lock switch or cargo door lock switch lock for greater than 2 minutes.

Action Taken When the DTC Sets

The BCM will ignore the command from affected door lock switch and the door lock switch will be inoperative.

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 1-2 Shift Solenoid (SS) Valve (M30)

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

1. Ignition ON, observe the scan tool BCM Driver Door Lock Sw. and the Driver Door Unlock Sw. parameters when pushing the appropriate switch on the driver door lock switch. The value should be Inactive and change to Active as each switch is pressed.

• If the values do not change, refer to Driver Door Lock Switch Malfunction.

2. Observe the scan tool BCM Psgr. Door Lock Sw. and the Psgr. Door Unlock Sw. parameters when pushing the appropriate switch on the passenger door lock switch. The value should be Inactive and change to Active as each switch is pressed.

• If the BCM Psgr. Door Lock Sw and Psgr. Door Unlock Sw values are always Inactive, refer to Passenger Door Lock Switch Malfunction.

• If the BCM Psgr. Door Lock Sw value is always Inactive, refer to Passenger Door Lock Switch Malfunction.

• If the BCM Psgr. Door Unlock Sw value is always Inactive, refer to Passenger Door Lock Switch Malfunction.

• If the BCM Psgr. Door Lock Sw or Psgr. Door Unlock Sw values are always Active, refer to Lock and Unlock Circuit Test.

3. Observe the scan tool BCM Psgr. Door Lock Sw. and the Psgr. Door Unlock Sw. parameters when pushing the appropriate switch on the cargo door lock switch. The value should be Inactive and change to Active as each switch is pressed.

• If the BCM Psgr. Door Lock Sw and Psgr. Door Unlock Sw values are always Inactive, refer to Cargo Door Lock Switch Malfunction.

• If the BCM Psgr. Door Lock Sw value is always Inactive, refer to Cargo Door Lock Switch Malfunction.

• If the BCM Psgr. Door Unlock Sw value is always Inactive, refer to Cargo Door Lock Switch Malfunction.

• If the BCM Psgr. Door Lock Sw or Psgr. Door Unlock Sw values are always Active, refer to Lock and Unlock Circuit Test.

Circuit/System Testing

Driver Door Lock Switch Malfunction

1. Ignition OFF, disconnect the harness connector at the driver door lock switch.

2. Ignition ON, verify the scan tool Driver Door Lock Sw parameter is Inactive.

• If not the specified value, test the signal circuit terminal G for a short to ground. If the circuit tests normal, replace the BCM.

3. Install a 3 A fused jumper wire between the signal circuit terminal G and ground. Verify the scan tool Driver Door Lock Sw 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 BCM.

4. Verify the scan tool Driver Door Unlock Sw parameter is Inactive.

• If not the specified value, test the signal circuit terminal F for a short to ground. If the circuit tests normal, replace the BCM.

5. Install a 3 A fused jumper wire between the signal circuit terminal F and ground. Verify the scan tool Driver Door Unlock Sw 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 BCM.

6. If all circuits test normal, test or replace the driver door lock switch.

Passenger Door Lock Switch Malfunction

1. Ignition OFF, disconnect the harness connector at the passenger door lock switch.

2. Test for less than 10 ohms between the ground circuit terminal A and ground.

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

3. Test for greater than 10 V between the signal circuit terminal listed below and ground:

* Signal circuit terminal F

* Signal circuit terminal G

• If less than the specified range, test the signal circuit for an open/high resistance.

4. If all circuits test normal, test or replace the passenger door lock switch.

Cargo Door Lock Switch Malfunction

1. Ignition OFF, disconnect the harness connector at the cargo door lock switch.

2. Test for less than 10 ohms between the ground circuit terminal E and ground.

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

3. Test for greater than 10 V between the signal circuit terminal listed below and ground:

* Signal circuit terminal A

* Signal circuit terminal D

• If less than the specified range, test the signal circuit for an open/high resistance.

4. If all circuits test normal, test or replace the cargo door lock switch.

Lock and Unlock Circuit Test

1. Ignition OFF, disconnect the harness connector at the cargo door lock switch.

2. Disconnect the harness connector at the passenger door lock switch.

3. Ignition ON, verify that the scan tool BCM Psgr. Door Lock Sw parameter is Inactive.

• If not the specified value, test the signal circuit terminals listed below for a short to ground. If the circuits test normal, replace the BCM

* Signal circuit terminal G - passenger door lock switch

* Signal circuit terminal A - cargo door lock switch

4. Verify that the scan tool BCM Psgr. Door Unlock Sw parameter is Inactive.

• If not the specified value, test the signal circuit terminals listed below for a short to ground. If the circuits test normal, replace the BCM

* Signal circuit terminal F - passenger door lock switch

* Signal circuit terminal D - cargo door lock switch

5. Connect the harness connector at the cargo door lock switch.

6. Observe the scan tool BCM Psgr. Door Lock Sw. and the Psgr. Door Unlock Sw. parameters when pushing the appropriate switch on the cargo door lock switch. The value should be Inactive and change to Active as each switch is pressed

• If a value is always Active, replace the cargo door lock switch.

7. Connect the harness connector at the passenger door lock switch.

8. Observe the scan tool BCM Psgr. Door Lock Sw. and the Psgr. Door Unlock Sw. parameters when pushing the appropriate switch on the passenger door lock switch. The value should be Inactive and change to Active as each switch is pressed.

• If a value is always Active, test or replace the passenger door lock switch.

9. If all circuits test normal, replace the BCM.

Component Testing

Door Lock Switch Test

1. Ignition OFF, disconnect the harness connector at the appropriate door lock switch.

2. Test for infinite resistance between the signal terminals and the ground terminal listed below with the switch in the inactive position:

* Driver door lock switch terminal F and A

* Driver door lock switch terminal G and A

* Passenger door lock switch terminal F and A

* Passenger door lock switch terminal G and A

* Cargo door lock switch terminal A and E

* Cargo door lock switch terminal D and E

• If less than the specified value, replace the door lock switch.

3. Test for less than 2 ohms between the signal terminal and the ground terminal listed below with the switch in the lock position:

* Driver door lock switch terminal F and A

* Passenger door lock switch terminal F and A

* Cargo door lock switch terminal A and E

• If greater than the specified value, replace the door lock switch.

4. Test for less than 2 ohms between the signal terminal and the ground terminal listed below with the switch in the unlock position:

* Driver door lock switch terminal G and A

* Passenger door lock switch terminal G and A

* Cargo door lock switch terminal D and E

• If greater than the specified value, replace the door lock switch.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Door Lock Switch Replacement Service and Repair

* Control Module References Control Module References for BCM replacement, setup, and programming