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

Fog lights not working

Make
Fiat
Model
Ulysse Factory Service Manual
Year
2002–2010
Section
Lights › Fog lights not working
Fault diagnosisFog lights not working

FOG LIGHTS NOT WORKING

The dipped headlamps must already be on in order to activate the Fog Lights.

The fog lights are controlled by the Steering Wheel Controls Node NVO, managed by the Body Computer Node BSI and activated by the Engine Compartment Junction Unit Node BSM.

STEPOPERATIONS TO BE CARRIED OUTTEST RESULTS
0PRELIMINARY CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Activate the appropriate control and check whether the warning light in the dashboard comes on.Move on to StepThe warning light is activated.See table I28 FOG LAMP (ONE) NOT WORKING
1BATTERY VOLTAGE CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check that the battery voltage is correct.Move on to StepBattery voltage not correct.Restore the correct voltage.
2CHECK USING DIAGNOSTIC EQUIPMENTALL OKPROBLEMS ENCOUNTEREDACTION
Connect the Examiner diagnostic equipment and check whether the following parameters are present and that there are no errors in the Body Computer ambient.Move on to Step1. Impossible to connect with the control unit.1. Replace the Body Computer control unit.
2. Errors presentMove on to Step
3ERRORS CHECKALL OKPROBLEMS ENCOUNTEREDACTION

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

  • Left/right fog light light error
  • Connection error with steering column switch unit lights
  • Connection error with Engine Casing (BSM).
  • VAN CON and CAR relay.
  • VAN CONF: connection with Instrument Panel
  • Inconsistent operation
Move on to Step1. Error detected at left/right fog lights.

1.

See table I28 FOG LAMP (ONE) NOT WORKING

2. Connection error with steering column switch unit module detected.Move on to Step
3. Connection error with Engine Casing module (BSM) detected.Move on to Step
4. Connection error with VAN CON and CAR network detected.Move on to Step
5. Connection error with Instrument Panel

5.

See table K95 WARNING LIGHT SYMBOLS DO NOT COME ON / (IN INSTRUMENT PANEL)

6. Operation inconsistency error6. Continue as described by the diagnostic equipment.
4ACTIVE DIAGNOSIS CHECKALL OKPROBLEMS ENCOUNTEREDACTION

With the Examiner in the Body Computer ambient check that the function in question is correctly activated in Active Diagnosis.

  • Left/right fog lights control
Move on to StepImpossible to activate one of the fog lights.See table I28 FOG LAMP (ONE) NOT WORKING
5CHECK USING DIAGNOSTIC EQUIPMENTALL OKPROBLEMS ENCOUNTEREDACTION

Using the Examiner check the variation in the status of the parameters by activating the appropriate controls in the Steering Wheel Controls Node ambient. The parameters involved are:

  • Fog light control +
  • Fog light control -
Move on to Step1. Impossible to connect with the control unit.1. Replace the Steering Wheel Controls Node control unit.
2. No variation in the state of the parameters under consideration is detectedMove on to Step
6CONTROL UNIT ELECTRICAL CIRCUIT CHECKALL OKPROBLEMS ENCOUNTEREDACTION

Check the Steering Wheel Controls Node electrical circuit in the following order:

  • Presence of battery positive at the network connection
  • Protective/supply fuse(s).
  • Wiring between the Body Computer and the Steering Wheel Controls Node.
  • Control unit earth.
Move on to Step1. Control unit faulty.1. Replace the Steering Wheel Controls Node control unit.
2. Protective fuse/s blown2. Replace the component involved (in the case of a fuse, find out what caused it to blow).
3. Wiring defective3. Restore wiring
4. Control unit earth faulty4. Restore the correct operation of the control unit earth
7CONTROL UNIT ELECTRICAL CIRCUIT CHECKALL OKPROBLEMS ENCOUNTEREDACTION

Check the Engine Compartment Junction Unit Node (BSM) electrical circuit in the following order:

  • Presence of battery positive at the network connection
  • Protective/supply fuse(s).
  • Wiring between the Body Computer and the Engine Compartment Junction Unit Node (BSM).
  • Control unit earth.
Move on to Step1. Control unit faulty.1. Replace the BSM control unit.
2. Protective fuse/s blown.2. Replace the component involved (in the case of a fuse, find out what caused it to blow).
3. Wiring defective.3. Restore wiring
4. Control unit earth faulty.4. Restore the correct operation of the control unit earth
8CHECK 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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