22 · Diagnostics

Main beam headlamps not working

Make: Fiat
Model: Idea Factory Service Manual
Year: 2003–2012
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 stalk unit ring nut 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 third 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
	Restore the two relays to their original positions. With the ignition ON, check that the main beam headlamps relay is correctly supplied by the battery. Then, connect to the supply for the relay from the Body Computer and check that the power supply is sent to the relay when the fog lights are activated. Also check that the electrical connections between the battery and the relay are not faulty See E2012 MAIN BEAM HEADLAMPS Do not disconnect the relay	Continue to Step 4	No power supply from the battery	Restore the correct power supply to the relay. If necessary, replace the faulty components (if a fuse is involved, search for the cause of the problem first)
			Supply enablement not provided by the Body Computer	Continue to Step 4
			Connections faulty	Restore the correct connections. See E2012 MAIN BEAM HEADLAMPS
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. 5540B32
			Front right light cluster faulty	Repair or replace front lights cluster Op. 5540B79
			Front left light cluster faulty	Repair or replace front lights cluster Op. 5540B78
6	MAIN BEAM HEADLAMPS ELECTRICAL CIRCUIT CHECK	All OK	Problems met	Operation
	Check, in order: left and right main beam headlamp fuses connection between stalk unit and Body Computer; connection between Body Computer and engine compartment control unit; connections between engine bay control unit and bulbs; bulb earth 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 E2012 MAIN BEAM HEADLAMPS
			Lamps earth defective	Restore the earth to the bulbs 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 E2012 MAIN BEAM HEADLAMPS	Continue to Step 8	Stalk unit faulty	Replace the stalk unit Op. 5550A12
8	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists	Replace the Body Computer Op. 5505A32

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

Parts & tools for this job For 2003 Fiat Idea

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