B3150

DTC B3140, B3145, B3150, or B3155 (WITH RPO CODE AXA)

DIAGNOSTIC INSTRUCTIONS
- Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
- Review Strategy Based Diagnosis for an overview of the diagnostic approach.
- Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC DESCRIPTOR

DTC B3140
Driver Unlock Switch Circuit Short to Ground

DTC B3145
Passenger Unlock Switch Circuit Short to Ground

DTC B3150
Driver Lock Switch Circuit Short to Ground

DTC B3155
Right Front Lock Switch Circuit Short to Ground




DIAGNOSTIC FAULT INFORMATION

CIRCUIT/SYSTEM DESCRIPTION
The body control module (BCM) controls the door lock, passenger door unlock and driver door unlock relays. Voltage is applied to the appropriate relay through the door lock/unlock control circuit when the BCM senses a door lock/unlock switch activation or a keyless entry lock or unlock command.

CONDITIONS FOR RUNNING THE DTC
The system voltage must be between 9-16 volts.

CONDITIONS FOR SETTING THE DTC

B3140 or B3150
The BCM detects a short to ground in the Left Lock Switch or Unlock Switch signal circuits.

B3145 or B3155
The BDM detects a short to ground in the Right Lock Switch or Unlock Switch signal circuits.

ACTION TAKEN WHEN THE DTC SETS
- The BCM stores the DTC to memory.
- The power door locks will not operate

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.
- The technician issues a scan tool CLEAR DTCs command.

CIRCUIT/SYSTEM TESTING
1. Ignition OFF, disconnect the harness connector at the appropriate Door Lock Switch.
2. Ignition ON, verify the appropriate scan tool Lock Sw parameter is Inactive.
- If not the specified value, test the signal circuit terminal E for a short to ground. If the circuit tests normal, replace the BCM.
3. Verify the appropriate scan tool Unlock Sw parameter is Inactive.
- If not the specified value, test the signal circuit terminal D for a short to ground. If the circuit tests normal, replace the BCM.
4. If all circuits test normal, test or replace the appropriate door lock switch.

COMPONENT TESTING
1. Ignition OFF, disconnect the harness connector at the applicable door lock switch.
2. Test for infinite resistance between the signal terminals D and E and the ground terminal B with the switch in the at rest position.
- If less than infinite resistance, replace the applicable door lock switch.
3. Test for less than 2 ohms of resistance between the signal terminal D and the ground terminal B with the switch in the unlock position.
- If greater than 2 ohms, replace the applicable door lock switch.
4. Test for less than 2 ohms of resistance between the signal terminal E and the ground terminal B with the switch in the lock position.
- If greater than 2 ohms, replace the applicable door lock switch.


REPAIR INSTRUCTIONS
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
- Programming and Relearning Programming and Relearning
- Door Lock and Side Window Switch Replacement - Driver Side
- Door Lock and Side Window Switch Replacement - Passenger Side