B2530

DTC B2530

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview

Review Strategy Based Diagnosis for an overview of the diagnostic procedure.

Diagnostic Procedure Instructions 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 Open or Short to Voltage

Diagnostic Fault Information





Circuit/System Description

When the fog lamp switch is placed in the ON position, ground is applied through the fog lamp switch signal circuit at G300 to the body control module (BCM). The BCM applies battery voltage through the fog lamp relay control circuit to the coil side of the fog lamp relay. Battery voltage is applied at all times from the FOG LAMP fuse to the switch side of the fog lamp relay. When the relay coil is energized, the relay switch contacts close and allow battery voltage to be applied from the FOG LAMP fuse, through the relay switch contacts, to the fog lamps. Ground for the fog lamps is applied at all times at G101 for the left fog lamp and G102 for the right fog lamp. G102 also serves as ground for the coil side of the fog lamp relay. For more detailed information concerning fog lamp operation refer to Exterior Lighting Systems Description and Operation.

Conditions for Running the DTC

Battery voltage must be between 9-16 volts.

Conditions for Setting the DTC

* DTC B2530 02 will set when the BCM detects a short to ground in the front fog lamp relay control circuit.
* DTC B2530 05 will set when the BCM detects an open or short to voltage in the front fog lamp relay control circuit.

Actions Taken When the DTC Sets

* When DTC B2530 02 is present, the front fog lamps will not operate when the park lamps are ON and the front fog lamp switch is active.
* When DTC B2530 05 is present, the front fog lamps and/or the front fog lamp indicator will be ON at all times or will not operate.

Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists.
* You issue a scan tool CLEAR DTCs command.
* A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Circuit/System Testing

1. Ignition OFF, disconnect the front fog lamp relay.
2. Test for less than 1.0 ohm of resistance between the fog lamp relay ground circuit and ground at the relay terminal.

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

3. Connect a test lamp between the front fog lamp relay control circuit and the ground circuit at the relay terminals.
4. 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 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 after completing the diagnostic procedure. Verification Tests

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