Workshop Manuals Factory service & repair Alfa Romeo
Alfa Romeo Brera and Spider Factory Service Manual (2005-2010)23 · Fault diagnosis
23 · Diagnostics

Dipped headlamps not working

Make
Alfa Romeo
Model
Brera and Spider Factory Service Manual
Year
2005–2010
Section
Lights › Dipped headlamps not working
Fault diagnosisDipped headlamps not working

DIPPED HEADLAMPS NOT WORKING

Gas discharge headlamps

it should be remembered that xenon bulbs do not have a filament and cannot therefore be tested using an ohmmeter

Test results
1CHECK USING DIAGNOSTIC EQUIPMENTAll OKProblems encounteredOperation
Check the master headlamp control unit (left side) and check for errors. Connect to the slave headlamp control unit (right side) and check for errors.Move on to Step 2Error B1010 detected - xenon lamp fails to come onMove on to Step 4
Error B1050 detected - power supply wiring resistanceMove on to Step 3
Error B1001detected - xenon lamp high tension operation

Replace the lamp control unit where the error was detected

Op. 5540B40 CONTROL UNIT IN LEFT GAS DISCHARGE LIGHT CLUSTER - R.R.

and/or

Op. 5540B41 CONTROL UNIT IN RIGHT GAS DISCHARGE LIGHT CLUSTER - R.R.

2IGNTION-OPERATION POWER SUPPLY CHECKAll OKProblems encounteredOperation

With the ignition key in the ON position, check that the voltage at the headlamps si correct by carrying out the

See Test 5540BJ CHECK IGNITION-OPERATED HEADLAMP POWER SUPPLY

Move on to Step 3
3DIPPED BEAM POWER SUPPLY CHECKAll OKProblems encounteredOperation

Turn the steering column switch unit lever to the dipped headlamps position and check that the voltage at the headlamps is correct, by carrying out the

See Test 5540BA DIPPED BEAM CIRCUIT CHECK

Move on to Step 4
4CHECK ON OPERATION OF BULBSAll OKProblems encounteredOperation

Check that the bulbs are working by tyring to replace them

Op. 5540B45 GAS DISCHARGE DIPPED/MAIN BEAM HEADLAMP BULB - R.R.

End of diagnosisRight headlamp bulb defective (after it is replaced it works correctly)Restore the original bulb for the left headlamp (which is still off) and move on to Step 5
Left headlamp bulb defective (after it is replaced it works correctly)Restore the original bulb for the right headlamp (which is still off) and move on to Step 5
5HEADLAMP WIRING CHECKAll OKProblems encounteredOperation

Check the continuity of the wiring between the master and slave headlamp 14-way connector and the control unit side connector by conducting the

See Test 5540BK CHECK THE CONTINUITY OF THE LOW BEAM WIRING INSIDE THE HEADLAMP

End of diagnosisThe fault persistsContact the Service Department for further information on the problem

Parts & tools for this job For 2005 Alfa Romeo Brera

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