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: Driver Unlock Switch CircuitDTC B3145: Passenger Unlock Switch Circuit
DTC B3150: Driver Lock Switch Circuit
DTC B3155: Right Front Lock Switch Circuit
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Driver Door Switch Lock Signal | B3150 | 1 | 1 | -- |
Driver Door Switch Unlock Signal | B3140 | 2 | 2 | -- |
Passenger Door Switch Lock Signal | B3155 | 3 | 3 | -- |
Passenger Door Switch Unlock Signal | B3145 | 4 | 4 | -- |
Low Reference | -- | 5 | -- | -- |
1. Lock inoperative from driver switch 2. Unlock inoperative from driver switch 3. Lock inoperative from passenger switch 4. Unlock inoperative from passenger switch 5. Lock/Unlock inoperative from driver or passenger switch | ||||
Circuit/System Description
The power door lock switch signal circuits are referenced from battery voltage by the body control module (BCM). When a switch is pressed to the lock or unlock position the appropriate signal circuit is grounded. When a signal circuit is grounded the reference voltage goes low indicating to the BCM that the corresponding switch is active.
Conditions for Running the DTC
Battery voltage is between 9-16 volts.
Conditions for Setting the DTC
A door lock or unlock switch input to the BCM is active for greater than 60 seconds.
Action Taken When the DTC Sets
The input signal will be ignored by the BCM for as long as the code is current.
Conditions for Clearing the DTC
| • | When the input signal has inactive for 2.5 seconds the DTC will be a history status code. |
| • | The history code will clear after 50 fault-free ignition cycles or by using the scan tool clear DTCs feature. |
Diagnostic Aids
A current switch code indicates that the switch is stuck or the signal circuit is shorted to ground.
Reference Information
Schematic Reference
Door Lock/Indicator Schematics
Connector End View Reference
Vehicle Access Connector End Views
Description and Operation
Power Door Locks Description and Operation
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
Observe the scan tool door lock and unlock switch parameters while operating the switch to the lock and unlock positions. The readings should change from inactive to active.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the door lock switch.
- Test for less than 1 ohm of resistance between the ground circuit terminal B and ground.
- Verify the scan tool door lock and unlock switch parameters are inactive.
- Install a 3A fused jumper wire between the signal circuits listed below and the ground circuit terminal B. Verify the scan tool door lock and unlock switch parameters are active.
- If all circuits test normal, test or replace the door lock switch.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If not the specified value, test the signal circuit listed below for a short to ground. If the circuit tests normal, replace the BCM. |
| • | Lock terminal D |
| • | Unlock terminal E |
| • | Lock terminal D |
| • | Unlock 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. |
Component Testing
- Ignition OFF, disconnect the harness connector at the door lock switch.
- Test for infinite resistance between the signal terminal listed below and the ground terminal B with the switch in the open position.
- Test for less than 1 ohm between the signal terminal listed below and the ground terminal B with the switch in the closed position.
| • | Lock terminal D |
| • | Unlock terminal E |
| ⇒ | If not the specified value, replace the door lock switch. |
| • | Lock terminal D |
| • | Unlock terminal E |
| ⇒ | If greater than the specified range, replace the door lock switch. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, programming, and setup |
