| 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. Presence of error detectedB1010 - Xenon fails to come on | 1. Move on to Step 4 |
| 2. Presence of error detectedB1050 - supply wiring resistance | 2. Move on to Step 3 |
| 3. Presence of error detectedB1001 - Xenon high voltage operation | 3. Replace the lamp control unit where the error was detectedOp. 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 CHECK IGNITION-OPERATED HEADLAMP POWER SUPPLY | 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 DIPPED BEAM CIRCUIT CHECK | Move on to Step 4 | | |
| 4 | CHECK ON OPERATION OF BULBS | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Check that the bulbs are working by tyring to replace themSee Test 5540B45 GAS DISCHARGE DIPPED/MAIN BEAM HEADLAMP BULB - 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 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 diagnosis | The fault persists | Contact the Service Department for further information on the problem |
