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 Descriptors
DTC B2530 02
- Front Fog Lamps Control Circuit Short to Ground

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

Diagnostic Fault Information





Circuit/System Description

The front fog lamp relay is supplied with battery voltage at all times via the FRT FOG LP fuse. 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 voltage 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 FRT FOG LP fuse to the front fog lamp control circuit which illuminates the front fog lamps. The front fog lamp relay control circuit also controls the front fog lamp switch indicator.

Conditions for Running the DTC

* Battery voltage must be between 9-16 volts.
* Front fog lamps ON.

Conditions for Setting the DTC

DTC B2530 02

The DTC will set when the BCM detects a short to ground in the front fog lamp relay control circuit for 5 seconds or greater.

DTC B2530 05

The DTC will set when the BCM detects a short to voltage or an open in the front fog lamp relay control circuit for 5 seconds or greater.

Actions Taken When the DTC Sets

DTC B2530 02

When the DTC is present, the front fog lamps will not operate when the park lamps are ON and the front fog lamp switch is active.

DTC B2530 05

When the DTC is present, for a short to voltage condition the front fog lamps and the front fog lamp switch indicator will be on at all times when the park lamps are OFF and the front fog lamp switch is inactive. For an open condition, the front fog lamps and the front fog lamp switch indicator will not operate when the park lamps are ON and the front fog lamp switch is active.

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

Fog Lights Schematics (Fog Lights Schematic)
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 front fog lamp relay.
2. Ignition OFF, exterior lamps OFF, test for less than 5 ohms between the ground circuit terminal 86 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 85 and ground.
4. Command the 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.

5. If all circuits test normal, test or replace the front fog lamp relay.

Repair Instructions

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

* Relay Replacement (Attached to Wire Harness) (Relay Replacement (Attached to Wire Harness))Relay Replacement (Within an Electrical Center) (Relay Replacement (Within an Electrical Center))
* Underhood Electrical Center or Junction Block Replacement (Underhood Electrical Center or Junction Block Replacement)
* Control Module References (Programming and Relearning) for BCM replacement, setup, and programming