B3150
DTC B3140, B3145, B3150, or B3155Diagnostic Instructions
^ Perform the [Diagnostic System Check - Vehicle Diagnostic Information] prior to using this diagnostic procedure. Diagnostic System Check - Vehicle Diagnostic Information
^ Review [Strategy Based Diagnosis] for an overview of the diagnostic approach. Strategy Based Diagnosis
^ [Diagnostic Procedure Instructions - Vehicle Diagnostic Information] provides an overview of each diagnostic category. Diagnostic Procedure Instructions - Vehicle Diagnostic Information
DTC Descriptors
DTC B3140 Driver Unlock Switch Circuit
DTC B3145 Passenger Unlock Switch Circuit
DTC B3150 Driver Lock Switch Circuit
DTC B3155 Right Front 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 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
B3140 or B315O
The BCM detects a short to ground in the driver door lock switch lock or unlock signal circuits.
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.
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 L 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 U 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 U and L and the ground terminal C 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 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 - Vehicle Diagnostic Information] after completing the diagnostic procedure. Diagnostic Repair Verification - Vehicle Diagnostic Information
^ [Power Door Lock Switch Replacement]
^ [Control Module References] for BCM replacement, setup, and programming Programming and Relearning