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Fiat Idea Factory Service Manual (2003-2012)22 · Fault diagnosis
22 · Diagnostics

Dipped headlamps not working

Make
Fiat
Model
Idea Factory Service Manual
Year
2003–2012
Section
Lights › Dipped headlamps not working
Fault diagnosisDipped headlamps not working

DIPPED HEADLAMPS NOT WORKING

When the stalk unit collar is operated with the key turned on, the dipped headlamps do not work.

Results of the tests
1DIPPED HEADLAMPS RELAY CHECK (POWER CIRCUIT)All OKProblems metOperation
Swap the dipped headlamps relay (in the junction unit under the dashboard) with the steering column switch unit relay (it is the one above on the right) and check that the dipped headlamps are working properly after the swapContinue to Step 2The dipped headlamps still do not work even after the swapContinue to Step 3
2REPLACING STEERING COLUMN SWITCH UNIT RELAY (POWER CIRCUIT)All OKProblems metOperation
Replace the steering column switch unit relay (which, in reality, was the one for the dipped headlamps) and check that the windscreen wipers are working properlyEnd of diagnosis
3DIPPED HEADLAMPS RELAY POWER SUPPLY CHECK (POWER CIRCUIT)All OKProblems metOperation

Restore the two relays to their original positions.

With the ignition ON, check that the dipped headlamps relay is correctly supplied by the battery.

Then, connect to the relay power supply from the Body Computer and check that the power supply is sent to the relay when the dipped headlamps are activated.

Also check that the electrical connections between the battery and the relay are not faulty See E2011 DIPPED HEADLAMPS

Do not disconnect the relay

Continue to Step 4No power supply from the batteryRestore the correct power supply to the relay. If necessary, replace the faulty components (if a fuse is involved, search for the cause of the problem first).
Supply enablement not provided by the Body ComputerContinue to Step 6
Connections faultyRestore the correct connections. See E2011 DIPPED HEADLAMPS
4CHECKING 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 through active diagnosis
Continue to Step 6Body Computer faultyContinue according to the instructions for the diagnostic equipment
Lights not activatedContinue to Step 5
5CHECK ON INDIVIDUAL LIGHTSAll OKProblems metOperation
Check the condition of individual bulbs and light units.Continue to Step 6Bulbs damagedReplace bulbs Op. 5540B22
Front right light cluster faultyRepair or replace front lights cluster Op. 5540B79
Front left light cluster faultyRepair or replace front lights cluster Op. 5540B78
6DIPPED HEADLAMPS ELECTRICAL CIRCUIT CHECKAll OKProblems metOperation

Check, in order:

  • Right and left dipped headlamp fuses;
  • Connections between steering column switch unit and Body Computer;
  • Connections between Body Computer and junction unit under dashboard;
  • Connections between junction unit under dashboard and bulbs;
  • Bulb earths See E2011 DIPPED HEADLAMPS
Continue to Step 7Defective componentReplace the component involved (if a fuse is involved, search for the cause of the problem)
Connections brokenRestore the connections See E2011 DIPPED HEADLAMPS
7CHECK ON STEERING COLUMN SWITCH UNITAll OKProblems metOperation
Check the stalk unit is working properly: in particular, check the side light switchContinue to Step 8Stalk unit not working properlyReplace the stalk unit Op. 5550A12
8CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosisThe fault persistsReplace the Body Computer Op. 5505A32

Parts & tools for this job For 2003 Fiat Idea

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