22 · Diagnostics

Fog lights not working

Make: Alfa Romeo
Model: 147 Factory Service Manual
Year: 2000–2004
Section: Lights › Fog lights not working

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Fault diagnosisFog lights not working

FOG LIGHTS NOT WORKING

When the front fog lamps switch is operated with the side lights on, the front fog lamps do not work.

1	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
		Results of the tests
	Connect an Examiner to the diagnostic socket Check that there are no faults in the Body Computer Check light operation while in active diagnosis mode.	Continue to Step 2	Fog lamp relay error	Checking fog lamp electric circuit/relay Continue to Step 3
		Continue to Step 2	Lights not activated	Check individual lights Continue to Step 2
2	CHECKING INDIVIDUAL LIGHTS	All OK	Problems met	Operation
	Check the condition of individual bulbs and lamps	Continue to Step 3	Left bulb damaged	Change the bulb
			Right bulb damaged	Change the bulb
			Fault in right front light cluster	Repair or replace front light cluster Op. 5540B75
			Fault in left front light cluster	Repair or replace front light cluster Op. 5540B74
3	CHECK FOG LAMP ELECTRIC CIRCUIT	All OK	Problems met	Operation
	Check, in order: front fog lamp fuse; fog lights relay; engine compartment control unit supply; connections between Body Computer and engine compartment control unit; connections between engine compartment control unit and bulbs; connections between Body Computer and fog lights switch; bulb earth: See E2030 FOG LIGHTS	Continue to Step 4	Component defective	Replace the component involved (if a fuse is involved, search for the cause of the problem)
		Continue to Step 4	Connections broken	Restore the connections: See E2030 FOG LIGHTS
4	CHECKING FOG LAMP SWITCH	All OK	Problems met	Operation
	Check the operation of the fog lamp switch See E2030 FOG LIGHTS	Continue to Step 5	Fog lamp switch defective	Replace the control panel Op. 5505A24
5	CHECKING BODY COMPUTER	All OK	Problems met	Operation
	Check that the Body Computer is working properly, in particular the front fog lamps control function	Continue to Step 6	Device not working	Replace the Body Computer Op. 5505A32
6	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present		Fault persists	Search for the fault starting from another symptom'

‹ Prev Reversing lights not working Next › Rear fog lamps not working

Parts & tools for this job For 2000 Alfa Romeo 147

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