2427519 - I23 HIGH BEAM (ONE) RH OR LH DOES NOT COME ON OR COMES ON IRREGULARLY/

When the steering column switch unit ring nut is operated with the ignition ON, one of the main beam headlamps does not work
Results of the tests
1CHECK ON INDIVIDUAL LIGHTSAll OKProblems metOperation
Check the condition of individual bulbs and light units.Continue to Step 2Bulbs damagedReplace bulbs
Front right light cluster faultyRepair or replace front lights cluster
Front left light cluster faultyRepair or replace front lights cluster
2DIPPED HEADLAMPS ELECTRICAL CIRCUIT CHECKAll OKProblems metOperation

Check, in order:

  • left or right main beam headlamp fuses;
  • connections between engine bay control unit and bulbs;
  • bulb earth: See   E2012  MAIN BEAM HEADLAMPS
Continue to Step 3Defective componentReplace the component involved (if a fuse is involved, search for the cause of the problem)
Defective componentRestore the connections
Defective componentRestore the earth to the bulbs See   E2012  MAIN BEAM HEADLAMPS
3CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer present End of diagnosis