| 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 B1010 detected - Failure of xenon headlamp to come on | 1.Move on to step 2 |
| 2.Presence of error B1050 detected - Supply wiring resistance | 2.Move on to step 3 |
| 3.Presence of error B1001 detected - xenon headlamp high tension 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 for the slave headlamp (right side) is correctly fitted. Check that the 14-way connector for the master headlamp (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 fitted. Check the condition of the wiring between the junction unit under the dashboard and the headlamp See E2011 DIPPED HEADLAMPSCheck that the headlamps are receiving a correct supply by carrying out the test See Test 5540BA CHECK ON DIPPED HEADLAMPS CIRCUIT | 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 7 | 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.Restore correct coupling (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 |
