B2530

DTC B2530

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 B2530 02
- Front Foglamps Control Circuit Short to Ground

DTC B2530 05
- Front Foglamps Control Circuit Short to Battery or Open




Circuit/System Description

The front fog lamp switch signal circuit is grounded momentarily by pressing the front fog lamp switch. The body control module (BCM) energizes the front fog lamp relay by applying battery positive voltage to the front fog lamps relay control circuit when the front fog lamp relay is energized, battery positive voltage is applied to the front fog lamps supply voltage circuit which illuminates the front fog lamps.


Conditions for Running the DTC

The battery voltage must be between 9-16 volts.


Conditions for Setting the DTC

B2530 02

The front fog lamp relay control circuit is shorted to ground.

B2530 05

The front fog lamp relay control circuit is shorted to battery positive voltage or open.


Action Taken When the DTC Sets

B2530 02

The front fog lamps will not operate.

B2530 05

The front fog lamps and the fog lamp indicator will be on at all times or will not operate.


Conditions for Clearing the DTC

* This DTC will clear on current status after the condition for setting the fault is corrected.
* A history DTC will clear after 100 consecutive ignition cycles without a fault present.



Reference Information
Schematic Reference

Fog Lights Schematics (Fog Lights Diagram)
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 X3 harness connector at the underhood fuse block.
2. Connect a test lamp between the ground circuit terminal F2 and B+. The test lamp should illuminate.

• If the test lamp does not illuminate, test the ground circuit for a short to voltage or an open/high resistance.

3. Reconnect the X3 harness connector at the underhood fuse block.
4. disconnect the X2 harness connector at the underhood fuse block.
5. Connect a test lamp between the control circuit terminal C3 and ground.
6. Command the front fog lamps 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 BCM.
• 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 BCM.

7. If all circuits test normal, replace the underhood fuse block.



Repair Instructions

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

* Control Module References (Programming and Relearning) for BCM replacement, setup, and programming
* Underhood Electrical Center or Junction Block Bracket Replacement (Underhood Electrical Center or Junction Block Bracket Replacement)