| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Check that there are no errors by connecting to the slave headlamp (right side) control unit.Check that there are no errors by connecting to the master headlamp (left side) control unit. | End of diagnosis | 1. Presence of error detectedB1010 - Xenon fails to come on | 1. Move on to Step 2 |
| 2. Presence of error detectedB1050 - Supply wiring resistance | 2. Move on to Step 3 |
| 3. Presence of error detectedB1001 - Xenon high voltage operation | 3. Move on to Step 4 |
| 2 | CHECK ON CONNECTOR AT HEADLAMP | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Check that the 14-way connector on the slave lamp (right side) is correctly fittedCheck that the 14-way connector on the master lamp (left side) is correctly fitted See E2011 DIPPED HEADLAMPS | Move on to Step 3 | Connector at headlamp not correctly fitted | Refit correctly See E2011 DIPPED HEADLAMPS |
| 3 | ELECTRICAL SYSTEM LIGHTS CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Check that the fuses are correctly inserted.Check the condition of the wiring from the under-dashboard junction unit to the headlamp See E2011 DIPPED HEADLAMPS Check that the headlamps are receiving the correct power supply, by carrying out the See Test 5540BA DIPPED BEAM CIRCUIT CHECK | Move on to Step 4 | | |
| 4 | CONTROL UNIT CONNECTORS CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Check that the connector for the screened cable for the headlamp bulb is correctly fitted in the housing for the ballast control unit.Check that the connector for the screened cable for the headlamp bulb is correctly fitted in the housing for the bulb connector.Check that the connector for the headlamp is correct fitted in the one for the ballast control unit. | Move on to Step 6 | 1. Screened cable not correctly fitted in the ballast control unit | 1. Refit correctly (master and slave headlamp) See E2011 DIPPED HEADLAMPS |
| 2. Screened cable not correctly fitted on the bulb | 2. Refit correctly (master and slave headlamp) See E2011 DIPPED HEADLAMPS |
| 3. Coupling between headlamp connector and ballast control unit not correct | 3. Refit correctly (master and slave headlamp) See E2011 DIPPED HEADLAMPS |
| 5 | CHECK ON OPERATION OF BULBS | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Check whether the fault disappears if the bulbs are replaced | End of diagnosis | The fault persists | Move on to Step 6 |
| 6 | CHECK ON OPERATION OF BALLAST CONTROL UNITS | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Replace the ballast control units and check that the dipped headlamps are working properly | End of diagnosis | The fault persists | Contact the Service Department for further information on the problem |
