| 1 | CHECK ON ALIGNMENT SENSOR WIRING | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
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|  | Check the condition of the wiring for the alignment sensors.Check that the alignment sensors are correctly fitted and, in particular, that the fastening of the bracket with the connecting rod is correct | Move on to Step 2 | 1. Wiring short circuited with +Vbatt or to earth | 1. Restore insulation for wiring    See E2011  DIPPED HEADLAMPS | 
| 2. Wiring broken | 2. Restore or, if necessary, replace the wiring | 
| 3. Mechanical installation of front sensor (brackets, connecting rods) incorrect | 3. Refit front sensor correctly    Op. 5540C42 SENSOR FOR CORRECTING/ALIGNING GAS DISCHARGE LIGHTING UNITS ON FRONT SUSPENSION - R R | 
| 4. Mechanical installation of rear sensor (brackets, connecting rods) incorrect | 4. Refit rear sensor correctly    Op. 5540C46 SENSOR FOR CORRECTING/ALIGNING GAS DISCHARGE LIGHTING UNITS ON REAR SUSPENSION - R.R. | 
| 2 | CHECK USING DIAGNOSTIC EQUIPMENT | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
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|  | Check that there are no errors by connecting to the master headlamp (left) control unit | End of diagnosis | 1. Presence of error detectedB1020 - Front sensor signal | 1. Move on to Step 3 | 
| 2. Presence of error detectedB1021 - Rear sensor signal | 2. Move on to Step 3 | 
| 3. Presence of error detectedB1022 - Sensor power supply | 3. Move on to Step 3 | 
| 4. Presence of error detectedB1030 - Master/Slave communication | 4. Move on to Step 4 | 
| 5. Presence of error detectedB1040 - Headlamp alignment corrector | 5. Move on to Step 5 | 
| 3 | CHECK ON ALIGNMENT SENSORS SUPPLY | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
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|  | Check that the alignment sensors are receiving a correct supply by carrying out the test    See Test 5540CA HEADLAMP ALIGNMENT SENSOR CHECK | Move on to Step 4 |  |  | 
| 4 | BIDIRECTIONAL SERIAL LINE CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
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|  | Check the continuity and the insulation of the two-way serial line between the master and slave headlamps, carrying out the test    See Test 5540BL BIDIRECTIONAL SERIAL LINE CHECK | Move on to Step 5 |  |  | 
| 5 | CHECK ON CONNECTIONS INSIDE THE HEADLAMPS | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
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|  | Check that the connections inside the headlamps for the vertical adjustment motors are correctly connected by carrying out the test    See Test 5540BM CHECK THE HEADLAMP ALIGNMENT MOTOR SUPPLY WIRING | Move on to Step 6 |  |  | 
| 6 | CHECK ON OPERATION OF HEADLAMP ALIGNMENT ACTUATORS | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
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|  | Replace the headlamps and check in active diagnosis that the diagnostic equipment activates the correct operation of the actuators | End of diagnosis | 1. Right headlamp alignment corrector not working | 1. Move on to Step 7 | 
| 2. Left headlamp alignment corrector not working | 2. Move on to Step 7 | 
| 7 | CHECK ON CORRECT OPERATION | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
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|  | Refit the headlamps replaced previously and replace the ballast control units. | End of diagnosis | The fault persists | Contact the Service Department for further information on the problem |