B3150

DTC B3140, B3145, B3150, or B3155

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 Initial Inspection and Diagnostic Overview.

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) 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 0.0 volts on the signal circuit.

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

CONDITIONS FOR SETTING THE DTC

DTC B3140 or B3150
The BCM detects a short to ground in the driver door lock switch lock or unlock signal circuits.

DTC B3145 or B3155
The BCM detects a short to ground in the passenger door lock switch lock or unlock 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 scan tool Lock Sw is Inactive.
- If not the specified value, test the signal circuit terminal L for a short to ground. If the circuit tests normal, replace the BCM.
3. Verify the scan tool Unlock Sw is Inactive.
- If not the specified value, test the signal circuit terminal U for a short to ground. If the circuit tests normal, replace the BCM.
4. If all circuits test normal, test or replace the applicable 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 U and L and the ground terminal C with the switch in the open 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 L and the ground terminal C with the switch in the lock 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 U and the ground terminal C with the switch in the unlock 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.
Control Module References for BCM replacement, setup and programming Programming and Relearning