22 · Diagnostics

Main beam headlamps not working

Make: Fiat
Model: Doblò Factory Service Manual
Year: 2000–2010
Section: Lights › Main beam headlamps not working

‹ Prev Dipped headlamps not working Next › Direction indicators / hazard warning lights / not working

Fault diagnosisMain beam headlamps not working

MAIN BEAM HEADLAMPS NOT WORKING

With the dipped headlamps switched on (stable position) or in the flashing mode, when the stalk unit ring nut is operated, the main beam headlamps do not work

1	CHECK WITH EXAMINER DIAGNOSTIC INSTRUMENT	All OK	Problems met	Operation
		Results of the tests
	Connect the EXAMINER diagnostic equipment to the diagnostic socket. Check that there are no faults in the Body Computer	Continue to Step 2	Main beam headlamps relay short circuit to +V Battery	Restore connections See E2012 MAIN BEAM HEADLAMPS
2	CHECK INDIVIDUAL LIGHTS	All OK	Problems met	Operation
	Check the condition of individual bulbs and light units.	Continue to Step 3	Bulbs damaged	Replace bulbs Op. 5540B22
	Check the condition of individual bulbs and light units.	Continue to Step 3	Light unit faulty	Repair or change the front light unit Op. 5540B79
3	MAIN BEAM HEADLAMPS ELECTRICAL CIRCUIT CHECK	All OK	Problems met	Operation
	Check, in order: left and right main beam headlamp fuses; connection between steering column switch unit and Body Computer; connection between Body Computer and junction unit; connections between junction unit and bulbs; bulb earth See E2012 MAIN BEAM HEADLAMPS	Continue to Step 4	Blown fuses	Replace the fuses, then search for the cause of the problem
			Connections not correct	Restore connections See E2012 MAIN BEAM HEADLAMPS
			Bulb earth faulty	Restore the earth to the bulbs See E2012 MAIN BEAM HEADLAMPS
4	CHECK ON BODY COMPUTER	All OK	Problems met	Operation
	Check that the Body Computer is supplied properly Check that when an earth signal from stalk unit to Body is activated, an earth signal is emitted from the Body to drive the dipped beam headlamps relay	Continue to Step 5	Incorrect supply	Restore the supply See E2012 MAIN BEAM HEADLAMPS
		Continue to Step 5	Body Computer faulty	Replace the Body Computer Op. 5505A32
5	STEERING COLUMN SWITCH UNIT CHECK	All OK	Problems met	Operation
	Check that the stalk unit is working properly; in particular check the side lights switch	Continue to Step 6	Stalk unit faulty	Replace the steering column switch unit Op. 5550A12
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 Dipped headlamps not working Next › Direction indicators / hazard warning lights / not working

Parts & tools for this job For 2000 Fiat Doblò

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