B3140
DTC B3140
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
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 voltage drop on the signal circuit.
Conditions for Running the DTC
The system voltage must be between 9-16 volts.
Conditions for Setting the DTC
The BCM detects a short to ground on the driver door unlock signal circuit.
Action Taken When the DTC Sets
The doors will not unlock 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 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
Ignition ON, observe the scan tool Driver Door Unlock Sw parameter while using the driver door lock switch. The parameter should change from Inactive to Active.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the driver door lock switch.
2. Ignition ON, verify the scan tool Door Unlock Sw parameter is Inactive.
• If not the specified value, test the signal circuit terminal listed below for a short to ground. If the circuit tests normal, replace the BCM.
* With YE9 driver door lock switch terminal D
* Without YE9 driver door lock switch terminal E
3. Install a 3A fused jumper wire between the signal circuit terminal listed below and ground. Verify the scan tool Door Unlock Sw parameter is Active.
* With YE9 driver door lock switch terminal D
* Without YE9 driver door lock switch terminal E
• 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. If all circuits test normal, test or replace the driver door lock switch.
Component Testing
1. Ignition OFF, disconnect the harness connector at the driver 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 the specified value, replace the driver door lock switch.
3. Test for less than 2 ohms between the signal terminal D and the ground terminal B with the switch in the lock position.
• If greater than the specified range, replace the driver door lock switch.
4. Test for less than 2 ohms between the signal terminal E and the ground terminal B with the switch in the unlock position.
• If greater than the specified range, replace the driver door lock switch.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Door Lock and Side Window Switch Replacement - Driver Side Door Lock and Side Window Switch Replacement - Driver Side
* Control Module References Control Module References for BCM replacement, setup, and programming