Service Information

Spark

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

The front fog lamp relay is supplied with battery voltage at all times. The front fog lamp switch energises the front fog lamp by applying voltage to the front fog lamp 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.

Circuit/System Verification

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

Circuit/System Testing

Ignition OFF, disconnect the appropriate harness connector at the front fog lamps listed below:

•	E29LF Fog Lamp - Left Front

•	E29RF Fog Lamp - Right Front

Test for less than 5 Ω between the appropriate front fog lamp ground circuit harness connector terminal A and ground.

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

Connect the harness connector to the fog lamps.
Ignition ON, connect a test lamp between B+ circuit terminal 16 at the I/P Fuse Block X3 connector and ground.

⇒	If the test lamp illuminates, test the control circuit for a short to voltage.

Connect a 5 A fused jumper wire between B+ and B+ circuit terminal 16 at the I/P Fuse Block X3 connector contact.

⇒	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 : Within an Electrical Center → Attached to Wire Harness