22 · Diagnostics

Main beam headlamps not working

Make: Fiat
Model: Stilo Factory Service Manual
Year: 2001–2007
Section: Lights › Main beam headlamps not working

‹ Prev Dipped headlamps not working Next › Dipped beam (one) rh or lh not working/

Fault diagnosisMain beam headlamps not working

MAIN BEAM HEADLAMPS NOT WORKING

Main beams do not work under any conditions (whether in stable position or light flasher position).

The main beams are controlled by the body computer node via a relay on the engine bay control unit.

Lights may be turned on/off via the following controls:

Control from stalk in fixed position
Control from stalk in instable 'light flasher' position

1	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
		Results of the tests
	Check an Examiner to the tester input and check the Body Computer Node for: faults in the main beam relay main beam parameter plausibility main beam relay operation (in active diagnosis)	Continue to Step 5	Presence of main beam relay anomalies	Continue as instructed by the tester
			Parameter not plausible	Continue to Step 5
			Main beam relay inactive	Continue to Step 2
2	CHECKING MAIN BEAM RELAY	All OK	Problems met	Operation
	Check condition of main beam relay	Continue to Step 3	Defective relay	Change relay
3	CHECKING ELECTRICAL SYSTEM INSIDE ENGINE BAY CONTROL UNIT (control circuit)	All OK	Problems met	Operation
	Check the continuity of the connection of the main beams inside the engine bay control unit See E2012 MAIN BEAM HEADLAMPS	Continue to Step 4	Engine bay junction unit interior connections broken	Change the engine bay junction unit Op. 5505A13
4	CHECKING ELECTRICAL SYSTEM INSIDE ENGINE BAY CONTROL UNIT (power circuit)	All OK	Problems met	Operation
	Check the continuity of the connection of the main beam power circuit inside the engine bay control unit See E2012 MAIN BEAM HEADLAMPS Check operation of the relay power contacts	Continue to Step 7	Connection broken	Restore electrical connection See E2012 MAIN BEAM HEADLAMPS
		Continue to Step 7	Power contacts insulated	Change relay
5	CHECKING ELECTRICAL EQUIPMENT	All OK	Problems met	Operation
	Check the continuity of the connections between control on stalk unit and body computer node See E2012 MAIN BEAM HEADLAMPS	Continue to Step 6	connection leads broken or not insulated	Renew the electrical connections See E2012 MAIN BEAM HEADLAMPS
6	CHECKING MAIN BEAM CONTROL OPERATION	All OK	Problems met	Operation
	Check stalk unit main beam control operation	Continue to Step 7	Stalk unit interior break	Replace the steering column switch unit Op. 5550A12
7	CHECKING CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present		Fault persists	Replace the Body Computer Op. 5505A32 Search for the fault starting from another symptom'

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Parts & tools for this job For 2001 Fiat Stilo

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