16 · Diagnostics

I20 Foglights not working

Fault diagnosisI20 Foglights not working

The fog lamps do not come on when the switch located on the central console is operated with the side lights on.

Step	Test procedure	Result	Action
1	CHECK INDIVIDUAL LIGHTS Check the condition of individual bulbs and lamps	OK	Move onto step 2
		Bulbs damaged	Replace bulbs End of diagnosis
		Lamp defective	Repair or replace the fog lamp Op. 5540D14 End of diagnosis
2	CHECK FOG LAMP ELECTRIC CIRCUIT Check, in order: fog lamp fuse fog lights relay. services control unit supply connections between relay and service control unit connection between relay and bulb connections between service control unit and fog lamp switch relay earth and bulbs fog lamp switch earth (Wiring diagram E2030 FOG LAMP ).	OK	Move onto step 3
		Component defective	Replace the component involved (if a fuse is involved, search for the cause of the problem) End of diagnosis
		Connections broken	Restore the connections ( End of diagnosis
3	SERVICES CONTROL UNIT CHECK Check that the services control unit is working properly, in particular the fog lamp control function see DESCRIPTION AND OPERATION: 5505 Instrument/guage electrical wiring (see 5505F)	OK	Move onto step 4
3		Control unit not working	Replace the services control unit Op. 5505A18 End of diagnosis
4	CHECK FOG LAMP SWITCH Check the operation of the fog lamp switch (Wiring diagram E2030 FOG LAMP ).	OK	Move onto step 5
4		Fog lamp switch faulty	Renew or replace the fog lamp switch Op. 5540D18 End of diagnosis
5	CHECK CORRECT OPERATION Check that the fault is no longer present	OK	End of diagnosis
5		Fault persists	Incorrect selection of diagnostic procedure

Parts & tools for this job For 1997 Alfa Romeo 156

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