B0525

DTC B0525 or B0530

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 Descriptors
DTC B0525 00
- Front Right Turn Indicator Circuit Malfunction

DTC B0530 00
- Front Left Turn Indicator Circuit Malfunction




Diagnostic Fault Information






Circuit/System Description

The turn signal switch is integrated into the steering column module. When the turn signal switch is activated, the steering column module interprets the position of the switch and sends a serial data message to the underhood electrical center (UEC) and the rear electrical center (REC) requesting either the right or left turn signals be activated. The UEC and REC respond by applying a pulsating voltage to the appropriate turn signal control circuits to illuminate the front and rear turn signal lamps. The steering column module also sends a serial data message to the instrument panel cluster (IPC) requesting the appropriate turn signal indicator be illuminated.


Conditions for Running the DTC

* Battery voltage must be between 9-16 volts.
* Right turn signals ON.



Conditions for Setting the DTC

B0525 00

The DTC will set when the UEC detects a short to ground or an open/high resistance in the right front turn signal control circuit.

B0530 00

The DTC will set when the UEC detects a short to ground or an open/high resistance in the left front turn signal control circuit.


Actions Taken When the DTC Sets

B0525 00

When DTC B0525 00 is present, the right front turn signal lamp will not operate.

B0530 00

When DTC B0530 00 is present, the left front turn signal lamp will not operate.


Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists.
* A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.



Reference Information
Schematic Reference

Exterior Lights Schematics (Exterior Lights Schematics)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Exterior Lighting Systems Description and Operation (Exterior Lighting Systems 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 Testing

1. Ignition OFF, disconnect the harness connector at the appropriate headlamp assembly.
2. Ignition OFF, exterior lamps OFF, test for less than 5.0 ohms between the ground circuit terminal 1 and ground.

• If greater than the specified range, test the ground circuit for an open/high resistance.

3. Connect a test lamp between the control circuit terminal 5 and ground.
4. Command the Front Turn Signal Test ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.

• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the UEC.
• If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the UEC.

5. If all circuits test normal, replace the inoperative front turn signal.



Repair Instructions

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

* Front Turn Signal Lamp Bulb Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for UEC replacement, setup, and programming