Dipped headlamps do not light up as they should

Make: Alfa Romeo
Model: GT Factory Service Manual
Year: 2003–2010
Section: Lights › Dipped headlamps do not light up as they should

‹ Prev Flashing, switching off or variation in dipped headlamps brightness Next › One headlamp remains immobile in any position

Fault diagnosisDipped headlamps do not light up as they should

DIPPED HEADLAMPS DO NOT LIGHT UP AS THEY SHOULD

One or both of the dipped headlamps do not light up the road at the desired distance, but point downwards.

Warning: Presence of high voltage (25 kV) at the gas discharge bulb connector during the first 0.7 secs after the dipped headlamps have been turned on.

Do not switch on the dipped headlamps when the discharge bulb connector is not correctly connected.

Do not disconnect the discharge bulb connector with the dipped headlamps switched on.

Handle the discharge bulb with clean, cloth gloves and never touch the glass bulb with your fingers.

Do not reverse the polarity of the lamp supply lines or else the control unit will be irreversably damaged.

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Check that the dipped headlamps are in the correct position and do not light up irregularly	Continue to Step 1	Both the headlamps are lowered and not moving	Continue according to the instructions in See table See table I65 DIPPED HEADLAMPS LOWERD AND NOT MOVING
			One headlamp is completely lowered and not moving, the other is working properly	Continue according to the instructions in See table See table I66 ONE DIPPED HEADLAMP LOWERED AND NOT MOVING
			One headlamp is not moving in any position, the other is working properly	Continue according to the instructions in See table See table I64 ONE HEADLAMP REMAINS IMMOBILE IN ANY POSITION
1	DEMARCATION CORRECTION CHECK	All OK	Problems met	Operation
	Check that the static/dynamic correction device for the dipped headlamps demarcation is working	End of diagnosis	There is no dipped headlamps demarcation correction	Continue to Step 2
2	SENSOR FITTING CHECK	All OK	Problems met	Operation
	Check that the front and rear sensors are correctly fitted	Continue to Step 3	Mechanical installation of front and/or rear sensor (brackets, connecting rods, etc.) not correct	Refit the sensor correctly
3	SENSOR OPERATION CHECK	All OK	Problems met	Operation
	Check that the front and rear sensors are working properly	Continue to Step 4	Front sensor damaged	Replace the damaged sensor Op. Op. 5540C42 SENSOR FOR CORRECTING/ALIGNING GAS DISCHARGE LIGHTING UNITS ON FRONT SUSPENSION - R R
	Check that the front and rear sensors are working properly	Continue to Step 4	Rear sensor damaged	Replace the damaged sensor Op. Op. 5540C46 SENSOR FOR CORRECTING/ALIGNING GAS DISCHARGE LIGHTING UNITS ON REAR SUSPENSION - R R
4	CHECK CONTROL UNIT	All OK	Problems met	Operation
	Check that the headlamp alignment control unit is working properly	Continue to Step 5	Control unit fault	Replace control unit Op. Op. 5540B43 CONTROL UNIT OF ONE RIGHT GAS DISCHARGE LIGHT CLUSTER ONE LH OR RH RR WITH LIGHT CLUSTER REMOVED
5	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 Flashing, switching off or variation in dipped headlamps brightness Next › One headlamp remains immobile in any position

Parts & tools for this job For 2003 Alfa Romeo GT

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