22 · Diagnostics

Fog lights not working

Make: Fiat
Model: Stilo Factory Service Manual
Year: 2001–2007
Section: Lights › Fog lights not working

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

Fault diagnosisFog lights not working

FOG LIGHTS NOT WORKING

Fog lamps do not work

Fog lamps are controlled by the Body Computer Node via a relay in the Engine Bay Control Unit

Lights may be turned on/off by a button on the lh control panel (pcs)

0	PRELIMINARY CHECK	All OK	Problems met	Operation
		Results of the tests
	Check the condition of the fog lamp fuse on the engine bay control unit	Continue to Step 1	Fuse blown	Check for short circuits by proceeding to step 5, then change fuse
1	CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Connect the Examiner to the tester input and check the following on the Body Computer Node: absence of Fog Lamp Relay faults Plausibility of fog lamp on/off parameter relay operation via active diagnosis	Continue to Step 5	Presence of low beam relay fault	Continue as instructed by the tester
			Fog lamp activation parameter does not change status	Continue to Step 8
			Relay does not activate	Continue to Step 2
2	CHECK FOG LAMP RELAY	All OK	Problems met	Operation
	Check condition of fog lamp relay	Continue to Step 3	Defective relay	Change relay
3	CHECKING ELECTRICAL SYSTEM IN ENGINE BAY CONTROL UNIT (control circuit)	All OK	Problems met	Operation
	Check internal continuity of the engine bay control unit (control circuit) See E2030 FOG LIGHTS	Continue to Step 4	Engine bay control unit connection with circuit open	Replace engine bay junction unit Op. 5505A13
4	CHECKING ELECTRICAL EQUIPMENT	All OK	Problems met	Operation
	Check the continuity of the connection between the engine control unit and the instrument panel () See E2030 FOG LIGHTS	Continue to Step 10	Connection broken	Renew the electrical connections See E2030 FOG LIGHTS
5	CHECKING ELECTRICAL CIRCUIT INSIDE ENGINE BAY CONTROL UNIT (power circuit)	All OK	Problems met	Operation
	Check the efficiency of the engine bay control unit internal circuit (power circuit) See E2030 FOG LIGHTS	Continue to Step 6	Connection with short circuit or open circuit in engine bay control unit	Change engine bay junction unit Op. 5505A13
6	CHECKING ELECTRICAL EQUIPMENT	All OK	Problems met	Operation
	Check condition of the electrical connection between engine bay control unit and fog lamp See E2030 FOG LIGHTS	Continue to Step 7	Connection with short circuit or open circuit	Renew the electrical connections See E2030 FOG LIGHTS
7	CHECKING FOG LAMP BULB CONDITION	All OK	Problems met	Operation
	Check the condition of the fog lamp bulbs	Continue to Step 10	Bulb fault	Replace bulbs Op. 5540D14
8	CHECKING ELECTRICAL EQUIPMENT	All OK	Problems met	Operation
	Check the continuity of the connecting cable between the fog lamp control and the Body Computer See E2030 FOG LIGHTS	Continue to Step 9	Connection broken	Renew the electrical connections See E2030 FOG LIGHTS
9	CHECKING FOG LAMP CONTROL	All OK	Problems met	Operation
	Check operation of the fog lamp control button See Test 5540AA Checking Exterior Lighting Control (C.L.E.)	Continue to Step 10	Fog lamp activation button faulty	Change the exterior lighting control panel Op. 5540A20
10	CHECKING CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present		Fault persists	Replace the Body Computer Op. 5505M32 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 2001 Fiat Stilo

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