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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 has overviews of all diagnostic categories.


DTC Descriptor

DTC B2530 01

Front Fog Lamps Control Circuit Short to Battery

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Front Fog Lamps Control

1

2

B2530 01

-

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 activated.

Conditions for Setting the DTC

The BCM detects a short to voltage on the control circuit.

Conditions for Clearing the DTC

The condition for setting the DTC is no longer present.

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 for information on diagnostic tools

Circuit/System Verification

Ignition ON, perform the Front Fog Lamps Relay test. The front fog lamps should be ON/OFF.

Circuit/System Testing


1. Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block - Underhood and X5 harness connector at the K9 Body Control Module.

2. Test for less than 0.3 V between the X50A Fuse Block - Underhood harness connector terminal 19 X2 and ground.

3. If greater than the specified range, test the control circuit for a short to voltage.

4. Test for infinite resistance between the X50A Fuse Block - Underhood harness connector terminal 19 X2 and ground.

5. If less than the specified range, test the control circuit for a short to ground.

6. Connect the X2 harness connector at the X50A Fuse Block - Underhood.

7. Ignition ON, install a 15 A fused jumper at the K9 Body Control Module harness connector X5 and momentarily touch ground with ground with the open end. Verify the Front Fog Lamps Relay activates.

8. If the Front Fog Lamps Relay is always active, test the control circuit for a short to ground. If the circuit tests normal, replace the X50A Fuse Block - Underhood.

9. If the Front Fog Lamps Relay is stays inactive, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the X50A Fuse Block - Underhood.

10. If all circuits test normal, replace the K9 Body Control Module.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Fuse Block Replacement

• Control Module References for information on BCM replacement, setup, and programming