B3150

DTC B3150

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.



DTC Descriptor
DTC B3150 5A
- Central Door Lock Switch Stuck




Diagnostic Fault Information






Circuit/System Description

The rear fuse block controls the rear door lock and rear door unlock relays. Voltage is applied to the appropriate relay through the door lock/unlock control circuit when the rear fuse block receives a door lock/unlock command from either the central door lock switch or a keyless entry lock or unlock command.


Conditions for Running the DTC

The system voltage must be between 9-16 volts.


Conditions for Setting the DTC

The rear fuse block receives a LOCK or UNLOCK command for greater than 2 minutes.


Action Taken When the DTC Sets

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.



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 Locks Description and Operation (Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information


Circuit/System Verification

Command the door latches to LOCK and UNLOCK by using the driver door lock switch, the doors should LOCK and UNLOCK.


Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the accessory switch assembly.
2. Ignition ON, test for 4.8-5.2 volts between reference circuit terminal 5 and ground.

• If less than the specified value test the reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the rear fuse block.

3. If all circuits test normal, replace the accessory switch assembly.



Repair Instructions

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


Accessory Switch Replacement (Service and Repair)


Control Module References (Programming and Relearning) for rear fuse block replacement, setup and programming