184000448 - I12 TURN SIGNALS RH OR LH SIDE NOT WORKING

When the lever on the stalk unit is raised or lowered (only one of the two cases), with the ignition on, the direction indicators do not work
Carry out the checks described on only one side where the fault occurs
Results of the tests
0PRELIMINARY CHECKSAll OKProblems metOperation
Press the hazard warning lights switch in the control panel and check that the direction indicators/hazard warning lights are activated and deactivatedContinue to Step 4Lights faulty even when the hazard warning lights are activatedContinue to Step 1
1CHECKING WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Connect the Examiner to the diagnostic socket

Check:

  • that there are no faults in the Body Computer
  • the operation of the lights in active diagnosis.
Continue to Step 4the operation of the lights in active diagnosis.Continue according to the instructions for the diagnostic equipment
Some of the bulbs do not come onContinue to Step 3
None of the bulbs manages to come onContinue to Step 2
2DIRECTION INDICATORS ELECTRICAL CIRCUIT CHECKAll OKProblems metOperation
Check the condition of the individual bulbs and complete bulb holder assembly

Check, in order:

  • connections between steering column switch unit and Body Computer;
  • connections between Body Computer and bulbs;
  • bulb earth See E2020 DIRECTION INDICATORS / HAZARD WARNING LIGHTS
Continue to Step 3Defective componentReplace the component involved (if a fuse is involved, search for the cause of the problem)
Connections brokenRestore the connections See E2020 DIRECTION INDICATORS / HAZARD WARNING LIGHTS
3CHECK ON INDIVIDUAL LIGHTSAll OKProblems metOperation
Check the condition of the individual defective bulbs and the bulb holder assemblyContinue to Step 4Front bulb damagedReplace the bulb Op. 5550C18
Damaged rear bulbReplace the bulb Op. 5550C26
Side repeater damagedReplace the side repeater Op. 5550C22
Rear bulb holder assembly faultyReplace the bulb holder assembly Op. 5540A44
Front left bulb holder assembly faultyReplace the bulb holder assembly Op. 5540B78
Front right bulb holder assembly faultyReplace the bulb holder assembly Op. 5540B79
4CHECK ON STEERING COLUMN SWITCH UNITAll OKProblems metOperation
Check that the steering column switch unit is working properly and check that the direction indicators switch is working properlyContinue to Step 5Stalk unit not working properlyReplace the stalk unit Op. 5550C18
5CHECK ON BODY COMPUTER SUPPLYAll OKProblems metOperation
Check that the Body Computer is supplied correctlyContinue to Step 6Incorrect supplyRestore the correct supply See E2020 DIRECTION INDICATORS / HAZARD WARNING LIGHTS
6CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosisFault persistsReplace the Body Computer Op. 5505A32