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Front Fog Lamps Malfunction

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.

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Front Fog Lamp Signal

1

1

2

-

Right Front Fog Lamp Ground

--

3

--

--

Left Front Fog Lamp Ground

--

4

--

--

1. Front Fog Lamps Inoperative

2. Front Fog Lamps Always ON

3. Right Front Fog Lamp Inoperative

4. Left Front Fog Lamp 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) energises the front fog lamp relay by applying ground to the front fog lamp relay control circuit. When the front fog lamp relay is energised, 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.

Reference Information

Schematic Reference

Fog Lamps 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 scan tool information

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 appropriate harness connector at the front fog lamps listed below:
    2. • E29LF Fog Lamp - Left Front
    • E29RF Fog Lamp - Right Front
  2. Test for less than 5 Ω between the appropriate front fog lamp ground circuit harness connector terminal A and ground.
    3. ⇒If greater than the specified value, test the ground circuit for an open/high resistance.
  3. Connect the harness connector to the fog lamps.
  4. Ignition ON, connect a test lamp between fuse F48UA output contact and ground.
    5. ⇒If the test lamp illuminates, test the control circuit for a short to voltage.
  5. Connect a 5 A fused jumper wire between B+ and fuse F48UA output contact.
    6. ⇒ If the front fog lamps illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the X50A Fuse Block - Underhood.
    ⇒ If the front fog lamps do not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the X50A Fuse Block - Underhood.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Relay Replacement
    •  Control Module References for BCM replacement, setup and programming
   


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