2427516 - I20 FOG LIGHTS NOT WORKING

When the front fog lamps switch is operated with the side lights on, the front fog lamps do not work.
Fog lamps are controlled by the Body Computer Node via a relay in the Engine Bay Control Unit
Lights may be turned on/off by a button on the centre control panel
Results of the tests
1CHECKING WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Connect the Examiner to the diagnostic socketCheck that there are no faults in the Body ComputerCheck light operation while in active diagnosis modeContinue to Step 2Fog lamp relay error Checking fog lamp electric circuit/relayContinue to Step 3
Lights not activatedCheck the individual lights. Continue to Step 2
2CHECK ON INDIVIDUAL LIGHTSAll OKProblems metOperation
Check the condition of individual bulbs and lampsContinue to Step 3Left bulb damagedChange the bulb
Left bulb damagedChange the bulb
Left bulb damagedRepair or replace the right fog light
Left bulb damagedRepair or replace the left fog light
3CHECK FOG LAMP ELECTRIC CIRCUITAll OKProblems metOperation

Check, in order:

  • front fog lamp fuse
  • front fog lights relay
  • Engine bay control unit power supply
  • Connections between body computer and engine bay control unit
  • connections between engine bay control unit and bulbs;
  • connections between Body Computer and fog lights switch;
  • bulb earth : See   E2030  FOG LIGHTS
Continue to Step 4Defective componentReplace the component involved (if a fuse is involved, search for the cause of the problem)
Connections brokenRestore the connections
Lamps earth defectiveRestore the earth to the bulbs : See   E2030  FOG LIGHTS
4CHECK ON FRONT FOG LAMPS SWITCHAll OKProblems metOperation
Check the operation of the fog lamp switch See   E2030  FOG LIGHTS Continue to Step 5Fog lights switch faultyReplace centre control panel
5CHECK ON BODY COMPUTERAll OKProblems metOperation
Check that the Body Computer is working properly, in particular the front fog lamps control functionContinue to Step 6Device not workingReplace the Body Computer
6CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer present End of diagnosis