22 · Diagnostics

Fog lights not working

Make: Lancia
Model: Ypsilon Factory Service Manual
Year: 2003–2011
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

When the front fog lamps switch is operated with the side lights on, the front 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 centre control panel

1	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
		Results of the tests
	Connect the 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 the individual lights. Continue to Step 2
2	CHECK ON 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
			Left bulb damaged	Change the bulb
			Left bulb damaged	Repair or replace the right fog light
			Left bulb damaged	Repair or replace the left fog light
3	CHECK FOG LAMP ELECTRIC CIRCUIT	All OK	Problems met	Operation
	Check, in order: front fog lamp fuse front fog lights relay Engine bay control unit power supply Connections between body computer and engine bay control unit connections between engine bay control unit and bulbs; connections between Body Computer and fog lights switch; bulb earth: See E2030 FOG LIGHTS	Continue to Step 4	Defective component	Replace the component involved (if a fuse is involved, search for the cause of the problem)
			Connections broken	Restore the connections
			Lamps earth defective	Restore the earth to the bulbs: See E2030 FOG LIGHTS
4	CHECK ON FRONT FOG LAMPS SWITCH	All OK	Problems met	Operation
	Check the operation of the fog lamp switch See E2030 FOG LIGHTS	Continue to Step 5	Fog lights switch faulty	Replace centre control panel
5	CHECK ON 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
6	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis

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

Parts & tools for this job For 2003 Lancia Ypsilon

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