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Fiat Ulysse Factory Service Manual (2002-2010)22 · Fault diagnosis
22 · Diagnostics

Brake lights and third brake light not working

Make
Fiat
Model
Ulysse Factory Service Manual
Year
2002–2010
Section
Lights › Brake lights and third brake light not working
Fault diagnosisBrake lights and third brake light not working

BRAKE LIGHTS AND THIRD BRAKE LIGHT NOT WORKING

The brake lights and the third brake light do not work when the brake pedal is pressed with the key ON.

The third brake lights are connected to the right rear brake light branch

STEPOPERATIONS TO BE CARRIED OUTTEST RESULTS
1CHECK USING DIAGNOSTIC EQUIPMENTALL OKPROBLEMS ENCOUNTEREDACTION

Connect the Examiner diagnostic equipment and check the variation of the parameter in the Body Computer ambient by pressing/releasing the pedal

  • Brake pedal
Move on to Step1. Impossible to connect with the control unit.

1.

See table I01 SIDE LIGHTS/NO. PLATE LIGHTS NOT WORKING

2.The value of the parameter does not alterMove on to Step
2ERRORS CHECKALL OKPROBLEMS ENCOUNTEREDACTION

Check for the presence of one or more of the following errors using the Examiner in the Body Computer ambient:

  • Brake switch error Never/Always pressed
  • Left/right brake light error
  • Inconsistent operation
Move on to Step1. Errors detected at the brake pedal.Move on to Step
2. Left/right brake light error detectedMove on to Step
3. Operation inconsistency error.3. Continue as described by the diagnostic equipment.
3BRAKE PEDAL ELECTRICAL CIRCUIT CHECKALL OKPROBLEMS ENCOUNTEREDACTION

Check the following, in order:

  • Brake lights protective fuse(s).
  • Wiring between junction unit and brake pedal switch.
  • Brake pedal switch.
Move on to Step1. Protective fuse/s blown1. Replace the component involved (in the case of a fuse, find out what caused it to blow).
2. Wiring defective2. Restore wiring
3. Brake pedal switch faulty3. Restore the correct operation of the brake pedal switch
4EXTERIOR LIGHTS ELECTRICAL CIRCUIT CHECKALL OKPROBLEMS ENCOUNTEREDACTION

Check the following, in order:

  • Brake lights protective fuse(s).
  • Wiring between junction unit and bulbs.
  • Condition of the bulbs and associated bulb holder
  • Earth for bulbs and/or bulb holder.
Move on to Step1. Protective fuse/s blown1. Replace the component involved (in the case of a fuse, find out what caused it to blow).
2. Wiring defective.2. Repair wiring.
3. Bulbs and/or bulb holder damaged.3. Repair or replace the bulb and/or rear light cluster.
4. Bulb holder earth faulty.4. Renew bulb holder earth.
5CENTRE LIGHT (THIRD BRAKE LIGHT) ELECTRICAL CIRCUIT CHECKALL OKPROBLEMS ENCOUNTEREDACTION

Check the following, in order:

  • Brake lights protective fuse(s).
  • Wiring between junction unit and bulbs.
  • Condition of the five bulbs and associated bulb holder
  • Earth for bulbs and/or bulb holder.
Move on to Step1. Protective fuse/s blown.1. Replace the component involved (in the case of a fuse, find out what caused it to blow).
2. Wiring defective.2. Repair wiring.
3. Bulbs and/or bulb holder damaged.3. Repair or replace the bulb and/or rear light cluster.
4. Bulb holder earth faulty.4. Renew bulb holder earth.
6CHECK ON CORRECT OPERATIONALL OKPROBLEMS ENCOUNTEREDACTION
Check that the fault is no longer present

Parts & tools for this job For 2002 Fiat Ulysse

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