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. |
DTC Descriptors
DTC B3140 00: Driver Unlock Switch CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Driver Door Lock Switch Lock Signal | 1 | 1 | 1 | -- |
Driver Door Lock Switch Unlock Signal | B3140 00 | 1 | 1 | -- |
Passenger Door Lock Switch Lock Signal | 1 | 2 | 2 | -- |
Passenger Door Lock Switch Unlock Signal | 1 | 2 | 2 | -- |
Door Lock Actuator Lock Control | 3 | 3 | 3 | -- |
Door Lock Actuator Unlock Control | 3 | 3 | 3 | -- |
Lock PCB Relay Control | B3135 00 | 3 | 3 | -- |
Unlock PCB Relay Control | 3 | B3125 00, B3130 00 | 3 | -- |
Driver Door Lock Switch Ground | -- | 1 | 1 | -- |
I/P Fuse Block Ground | -- | 3 | 3 | -- |
Passenger Door Lock Switch Ground | -- | 2 | 2 | -- |
1. Driver Door Lock Switch Malfunction 2. Passenger Door Lock Switch Malfunction 3. Door Latch Malfunction | ||||
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 fault in the driver door lock switch unlock signal circuit.
Action Taken When the DTC Sets
The driver door lock switch will malfunction.
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
Connector End View Reference
Description and Operation
Power Door Locks Description and Operation
Electrical Information Reference
Scan Tool Reference
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 between Inactive and Active.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the driver door lock switch.
- Ignition ON, verify the scan tool Door Unlock Sw parameter is Inactive.
- Install a 3A fused jumper wire between the signal circuit terminal E and ground. Verify the scan tool Door Unlock Sw parameter is Active.
- If all circuits test normal, test or replace the driver door lock switch.
| ⇒ | If not the specified value, test the signal circuit terminal E for a short to ground. If the circuit tests normal, replace the BCM. |
| ⇒ | 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. |
Component Testing
- Ignition OFF, disconnect the harness connector at the driver door lock switch.
- Test for infinite resistance between the signal terminals D and E and the ground terminal B with the switch in the at rest position.
- Test for less than 2 ohms between the signal terminal D and the ground terminal B with the switch in the lock position.
- Test for less than 2 ohms between the signal terminal E and the ground terminal B with the switch in the unlock position.
| ⇒ | If less than the specified value, replace the driver door lock switch. |
| ⇒ | If greater than the specified range, replace the driver door lock switch. |
| ⇒ | If greater than the specified range, replace the driver door lock switch. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, setup, and programming |
