B3145

DTC B3145 or B3155

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 B3145
- Right Front Unlock Switch Circuit

DTC B3155
- Right Front Lock Switch Circuit

Diagnostic Fault Information





Circuit/System Description

The passenger door lock switch signal circuits provide inputs to the passenger door module (PDM) when the passenger door lock switch is activated to the Lock or Unlock position. These inputs allow the PDM to detect a door Lock or Unlock request. The PDM provides power to the passenger door lock switch. When the PDM detects low voltage on a signal circuit, it will send a message on the serial data line to the remote control door lock receiver (RCDLR) to enter the power door latches in Lock or Unlock status.

Conditions for Running the DTC

Battery voltage must be between 9-16 volts.

Conditions for Setting the DTC

The PDM detects a short to ground on the passenger door lock switch lock or unlock signal circuit for greater than 30 seconds.

Actions Taken When the DTC Sets

The passenger 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 (Door Lock/Indicator Schematics)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Power Door Latch 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 (Programming and Relearning) for scan tool information

Circuit/System Verification

Ignition ON, observe the scan tool Door Lock Switch parameter while using the passenger door lock switch. The parameter should change from Idle to Lock and Unlock when changing between the commanded states.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the passenger door lock switch.
2. Verify that a test lamp illuminates between B+ and the ground circuit terminal C.

• If the test lamp does not illuminate, test the ground circuit for an open/high resistance.

3. Ignition ON, verify the scan tool Door Lock Switch parameter is Idle.

• If not the specified value, test the signal circuit listed below for a short to ground. If the circuit tests normal, replace the PDM.

* Signal circuit terminal D
* Signal circuit terminal E

4. If all circuits test normal, test or replace the passenger door lock switch.

Component Testing

1. Ignition OFF, disconnect the harness connector at the passenger door lock switch.
2. Test for infinite resistance between the signal terminals D and E and the ground terminal C with the switch in the open position.

• If less than the specified value, replace the passenger door lock switch.

3. Test for less than 2 ohms between the signal terminal E and the ground terminal C with the switch in the unlock position.

• If greater than the specified range, replace the passenger door lock switch.

4. Test for less than 2 ohms between the signal terminal D and the ground terminal C with the switch in the lock position.

• If greater than the specified range, replace the passenger door lock switch.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Door Lock Switch Replacement - Passenger Front (Door Lock Switch Replacement - Passenger Front)
* Control Module References (Programming and Relearning) for PDM replacement, setup, and programming