125000541 - I21 REAR FOG LAMPS NOT WORKING

When the rear fog lamp switch is operated with the dipped beam headlamps on (or front fog lamps on), the rear fog lamp does not work, and this fault is indicated by the relevant warning light.
Results of the tests
0PRELIMINARY CHECKSAll OKProblems metOperation
With the ignition ON, check that the dipped headlamps are working properly and that when they are activated the rear fog lamp can be switched on using the control panelEnd of diagnosisThe dipped headlamps are not activatedContinue according to the instructions inSee table    See table I05 DIPPED HEADLAMPS NOT WORKING
The reversing light is not activatedContinue to Step 1
1CHECK WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Connect the Examiner to the diagnostic socket.Check that there are no faults in the Body ComputerCheck light operation while in active diagnosis modeContinue to Step 4There are faults in the Body ComputerContinue to Step 2
2CHECK ON INDIVIDUAL LIGHTAll OKProblems metOperation
Check the condition of the individual bulbs and the rear fog lampContinue to Step 3Bulb damagedChange the bulb Op.    Op. 5540E14 BULB (ONE) FOR ONE REAR LAMP R+R
Bulb holder faultyRenew or replace the rear fog lamp Op.    Op. 5540E10 REAR FOG LAMP (ONE), LH OR RH - R+R
3CHECK ON REAR FOG LAMP ELECTRICAL CIRCUITAll OKProblems metOperation

Check, in order:

  • connections between rear fog lamp switch and Body Computer
  • connections between Body Computer and bulbs;
  • bulb earth;
  • Rear fog lamp switch earth See    See E2031 REAR FOG LAMPS
Continue to Step 4Connections brokenRestore the connections See    See E2031 REAR FOG LAMPS
Faulty earthRestore earth See    See E2031 REAR FOG LAMPS
4CHECK ON REAR FOG LAMP SWITCHAll OKProblems metOperation
Check rear fog lamp switch operation See    See E2031 REAR FOG LAMPSContinue to Step 5Rear fog lamp switch faultyReplace the rear fog lamps switch Op. 5540E18
5CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosis.