22 · Diagnostics

Main beam headlamps not working

Make: Alfa Romeo
Model: GT Factory Service Manual
Year: 2003–2010
Section: Lights › Main beam headlamps not working

‹ Prev Dipped headlamps not working Next › Side 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 steering column switch unit lever is operated, the main beam headlamps do not work.

1	MAIN BEAM HEADLAMPS RELAY CHECK (POWER CIRCUIT)	All OK	Problems met	Operation
		Results of the tests
	Swap the main beam headlamps relay (in the engine compartment junction unit) with the horn relay (the middle one in the same row) and check that the main beam headlamps are working properly after the swap	Continue to Step 2	The main beam headlamps still do not work even after the swap	Continue to Step 3
2	REPLACING HORN RELAY (POWER CIRCUIT)	All OK	Problems met	Operation
	Replace the horn relay (which, in reality, was the one for the main beam headlamps) and check that it is working properly	End of diagnosis
3	MAIN BEAM HEADLAMPS POWER SUPPLY CHECK (POWER CIRCUIT)	All OK	Problems met	Operation
	Refit the two relays in their original positions. With the ignition ON, check that the main beam headlamps relay is correctly supplied by the battery. Then connect to the relay supply from the Body Computer and check that when the main beam headlamps are activated, the supply is sent to the relay. Also check that the electrical connections between the battery and the relay are not faulty See See E2012 MAIN BEAM HEADLAMPS Do not connect the relay	Continue to Step 4	No supply from battery	Restore the correct supply to the relay. If necessary replace the faulty components (if a fuse is involved, search for the cause of the problem)
			Supply enablement not provided by the Body Computer	Continue to Step 6
			Connections faulty	Restore the correct connections.
4	CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Connect the Examiner to the diagnostic socket. Check: That there are no faults in the Body Computer The operation of the lights through active diagnosis	Continue to Step 6	Body Computer faulty	Continue according to the instructions for the diagnostic equipment
		Continue to Step 6	Lights not activated	Continue to Step 5
5	CHECK ON INDIVIDUAL LIGHTS	All OK	Problems met	Operation
	Check the condition of individual bulbs and light units.	Continue to Step 6	Bulbs damaged	Replace bulbs Op. 5540B22
	Check the condition of individual bulbs and light units.	Continue to Step 6	Front lights cluster faulty	Repair or replace front lights cluster Op. Op. 5540B76 FRONT LIGHT CLUSTER WITH FOGLAMP ONE LH OR RH R R WITH INTERFERING PARTS REMOVED
2.0 JTS 3.2 V6 1.9 JTD 16V Proiettori a scarica di gas	Check the condition of individual bulbs and light units.	Continue to Step 6	Bulbs damaged	Replace bulbs Op. 5540B46
2.0 JTS 3.2 V6 1.9 JTD 16V Proiettori a scarica di gas	Check the condition of individual bulbs and light units.	Continue to Step 6	Front lights cluster faulty	Repair or replace front lights cluster Op. Op. 5540B76 FRONT LIGHT CLUSTER WITH FOGLAMP ONE LH OR RH R R WITH INTERFERING PARTS REMOVED
6	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 engine compartment control unit Connections between engine bay control unit and bulbs; Bulb earth See See E2012 MAIN BEAM HEADLAMPS	Continue to Step 7	Blown fuses	Replace the fuses, then search for the cause of the problem
			Connections not correct	Restore the connections See See E2012 MAIN BEAM HEADLAMPS
			Lamps earth defective	Restore the earth to the bulbs See See E2012 MAIN BEAM HEADLAMPS
7	CHECK ON STEERING COLUMN SWITCH UNIT	All OK	Problems met	Operation
	Check that the stalk unit is working properly See See E2012 MAIN BEAM HEADLAMPS	Continue to Step 8	Stalk unit faulty	Replace the stalk unit Op. Op. 5550A12 COMPLETE STALK UNIT - R+R FOR VERSIONS WITH AIR BAG
8	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	The fault persists	Replace the Body Computer Op. Op. 5505A32 BODY COMPUTER - R R

‹ Prev Dipped headlamps not working Next › Side lights not working

Parts & tools for this job For 2003 Alfa Romeo GT

Links open Amazon search results in a new tab. As an Amazon Associate I earn from qualifying purchases.