22 · Diagnostics

Main beam headlamps not working

Make: Alfa Romeo
Model: 147 Factory Service Manual
Year: 2000–2004
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	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
		Results of the tests
	Connect the Examiner equipment to the diagnostic socket. Verify: that there are no faults in the Body Computer through the active diagnosis, the operation of the lights.	Continue to Step 3	Error – ( main beam headlamps relay)	Check - main beam headlamps relay/main beam headlamps electrical circuit. Continue to Step 3
		Continue to Step 3	Lights not activated	Check individual lights Continue to Step 2
2	CHECKING INDIVIDUAL LIGHTS	All OK	Problems met	Operation
	Check the condition of individual bulbs and light units.	Continue to Step 3	Bulbs damaged	Replace bulbs
			Fault in right front light cluster	Repair or replace front light cluster Op. 5540B75
			Fault in left front light cluster	Repair or replace front light cluster Op. 5540B74
3	MAIN BEAM HEADLAMPS ELECTRICAL CIRCUIT CHECK	All OK	Problems met	Operation
	Check, in order: left and right main beam headlamp fuses; main beam headlamps relay feed; connection between steering column switch unit and Body Computer; connection between Body Computer and engine compartment control unit; connections between engine compartment control unit and bulbs; bulbs 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 the connections: See E2012 MAIN BEAM HEADLAMPS
			Bulb earth faulty	Restore the earth to the bulbs: See E2012 MAIN BEAM HEADLAMPS
4	CHECKING STEERING COLUMN SWITCH UNIT	All OK	Problems met	Operation
	Check that the steering column switch unit is working properly: See E2012 MAIN BEAM HEADLAMPS	Continue to Step 5	Stalk unit faulty	Replace the stalk unit Op. 5550A12
5	CHECKING 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 6	Incorrect supply	Restore power supply See E2012 MAIN BEAM HEADLAMPS
		Continue to Step 6	Body Computer faulty	Replace the Body Computer Op. 5505A32
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 Alfa Romeo 147

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