22 · Diagnostics

Dipped headlamps not working

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

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Fault diagnosisDipped headlamps not working

DIPPED HEADLAMPS NOT WORKING

When the stalk unit collar is operated with the key turned on, the dipped headlamps do not work.

In the case of vehicles with gas discharge headlamps, it is possible that both bulbs and the control units are broken simultaneously. It is fairly improbable that there would be faults in both lamps simultaneously, therefore the possibility of problems with the Body Computer should be considered first. In rare cases there could be simultaneous problems with the bulbs, control units and Body Computer.

1	DIPPED HEADLAMPS RELAY CHECK (POWER CIRCUIT)	All OK	Problems met	Operation
		Results of the tests
	Swap the dipped headlamps relay (in the underdashboard junction unit) with the main beam headlamps relay (in the engine compartment junction unit) and check that the dipped headlamps are working properly after the swap	Continue to Step 2	The dipped headlamps still do not work even after the swap	Continue to Step 3
2	REPLACING MAIN BEAM HEADLAMPS RELAY (POWER CIRCUIT)	All OK	Problems met	Operation
	Replace the main beam headlamps relay (which, in reality, was the one for the dipped headlamps) and check that the main beam headlamps are working properly	End of diagnosis
3	DIPPED HEADLAMPS RELAY 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 dipped headlamps relay is correctly supplied by the battery. Then, connect to the relay power supply from the Body Computer and check that the power supply is sent to the relay when the dipped headlamps are activated. Also check that the electrical connections between the battery and the relay are not faulty See See E2011 DIPPED 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. See See E2011 DIPPED HEADLAMPS
4	CHECKING 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
2.0 JTS 3.2 V6 1.9 JTD 16V Proiettori a scarica di gas	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
2.0 JTS 3.2 V6 1.9 JTD 16V Proiettori a scarica di gas		Continue to Step 6	Lights not activated	Continue to Step 6
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
6	DIPPED HEADLAMPS ELECTRICAL CIRCUIT CHECK	All OK	Problems met	Operation
	Check, in order: Right and left dipped headlamp fuses; Connections between steering column switch unit and Body Computer; Connections between Body Computer and junction unit under dashboard; Connections between junction unit under dashboard and bulbs; Bulb earth See See E2011 DIPPED HEADLAMPS	Continue to Step 7	Defective component	Replace the component involved (if a fuse is involved, search for the cause of the problem)
		Continue to Step 7	Connections broken	Restore the connections See See E2011 DIPPED HEADLAMPS
7	CHECK ON STEERING COLUMN SWITCH UNIT	All OK	Problems met	Operation
	Check the stalk unit is working properly: in particular, check the side light switch	Continue to Step 8	Stalk unit not working properly	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
2.0 JTS 3.2 V6 1.9 JTD 16V Proiettori a scarica di gas	Check that the fault is no longer present	End of diagnosis	The fault persists	Continue according to the instructions in See table See table I60 FLASHING, SWITCHING OFF OR VARIATION IN DIPPED HEADLAMPS BRIGHTNESS

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Parts & tools for this job For 2003 Alfa Romeo GT

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