| 1 | CHECK ON INSTALLATION OF ALIGNMENT SENSORS | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Check the condition of the front and rear alignment sensors and make sure they are correctly installed.Make sure that the fasteing of the bracket and the connecting rod is correct for both the front and rear sensors | Move on to Step 2 | 1. Mechanical installation of front sensor (brackets, connecting rods) incorrect | 1. Refit front sensor correctly Op. 5540C42 SENSOR FOR CORRECTING/ALIGNING GAS DISCHARGE LIGHTING UNITS ON FRONT SUSPENSION - R R |
| 2. Mechanical installation of rear sensor (brackets, connecting rods) incorrect | 2. 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 side) control unit. | Move on to Step 3 | 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 detectedB1040 - Headlamp alignment corrector | 4. Move on to Step 5 |
| 3 | CHECK ON ALIGNMENT SENSOR SUPPLY | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Check that the attitude sensors are receiving a correct supply by carrying out the test See Test 5540CA HEADLAMP ALIGNMENT SENSOR CHECK | Move on to Step 4 | | |
| 4 | 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 See E3080 HEADLAMP AGLINMENT CORRECTOR | Move on to Step 5 | 1. Connector for right headlamp motor not correctly fitted | 1. Fit connector for right headlamp |
| 2. Connector for left headlamp motor not correctly fitted | 2. Fit connector for left headlamp |
| 5 | CHECK ON OPERATION OF HEADLAMP ALIGNMENT ACTUATORS | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Replace the left headlamps Op. 5540B81 LEFT GAS DISCHARGE LIGHT CLUSTER - R.R.and right Op. 5540B82 RIGHT GAS DISCHARGE LIGHT CLUSTER - R.R.and check that the motors are working properly | End of diagnosis | 1. Right headlamp alignment corrector not working | 1. Move on to Step 6 |
| 2. Left headlamp alignment corrector not working | 2. Move on to Step 6 |
| 6 | CHECK ON CORRECT OPERATION | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Refit the headlamp removed previously and replace the ballast control unitOp. 5540B42 | End of diagnosis | | |