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DTC B2530

DTC B2530

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 Descriptor

DTC B2530 02

Front Fog Lamps Control Circuit Short to Ground

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Front Fog Lamps Control B2530 02 2 1 -
1. Front Fog Lamps Always ON 2. Front Fog Lamps Inoperative


Circuit/System Description

The front fog lamp relay is supplied with battery voltage at all times. 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 ground to the front fog lamp relay control circuit. When the front fog lamp relay is energized, the relay switch contacts close and battery voltage is applied through the front fog lamp fuse to the front fog lamp supply voltage circuit which illuminates the front fog lamps.

Conditions for Running the DTC

Front fog lamps ON.

Conditions for Setting the DTC

The BCM detects a short to ground on the front fog lamp relay control circuit.

Action Taken When the DTC Sets

The front fog lamps will always be illuminated.

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

Fog Lights Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Exterior Lighting Systems Description and Operation

Electrical Information Reference


• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs


Scan Tool Reference

Control Module References

Circuit/System Testing


1. Ignition OFF, disconnect the X5 harness connector at the K9 BCM.

2. Ignition ON, test for B+ between the control circuit terminal 10 and ground.

3. If less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the X50A underhood fuse block.

4. If all circuits test normal, replace the K9 BCM.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Front Compartment Fuse Block Replacement

• Control Module References for BCM replacement, programming and setup