| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Check that there are no errors by connecting to the master (left side) headlamp control unit.Check that there are no errors by connecting to the slave (right side) headlamp control unit. | Move on to Step 2 | 1. Error B1010 - xenon lamp fails to come on detected | 1. Move on to Step 4 |
| 2. Error B1050 - power supply wiring resistance detected | 2. Move on to Step 3 |
| 3. Error B1001 - xenon lamp high tension operation detected | 3. Replace the lamp control unit where the error was detected Op. 5540B42 CONTROL UNIT OF ONE GAS DISCHARGE LIGHT CLUSTER R R |
| 2 | IGNTION-OPERATION POWER SUPPLY CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| With the ignition key in the ON position, check that the voltage at the headlamps si correct by carrying out the See Test 5540BJ IGNITION-OPERATED HEADLAMPS POWER SUPPLY CHECK | Move on to Step 3 | | |
| 3 | DIPPED BEAM POWER SUPPLY CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| 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 CHECK ON DIPPED HEADLAMPS CIRCUIT | Move on to Step 4 | | |
| 4 | BULB OPERATION CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Check that the bulbs are working by tyring to replace them Op. 5540B44 DIPPED BEAM FOR ONE GAS DISCHARGE LIGHTING UNIT ONE LH OR RH R R | End of diagnosis | 1. Right headlamp bulb defective (after it is replaced it works correctly) | 1. Restore the original bulb for the left headlamp (which is still off) and move on to Step 5 |
| 2. Left headlamp bulb defective (after it is replaced it works correctly) | 2. Restore the original bulb for the right headlamp (which is still off) and move on to Step 5 |
| 5 | HEADLAMP WIRING CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Check the continuity of the wiring between the 14-way headlamp connectorMater and Slave and control unit side connector, by carrying out the See Test 5540BK CHECK ON CONTINUITY OF DIPPED HEADLAMP WIRING INSIDE HEADLAMP | End of diagnosis | The fault persists | Contact technical service for further information on the problem |
