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Fiat Ducato Factory Service Manual (2002-2006)23 · Fault diagnosis
23 · Diagnostics

Dipped headlamps not working

Make
Fiat
Model
Ducato Factory Service Manual
Year
2002–2006
Section
Lights › Dipped headlamps not working
Fault diagnosisDipped headlamps not working

DIPPED HEADLAMPS NOT WORKING

When the stalk switch wheel is operated with the key ON, the dipped beams do not work

STEPOPERATIONS TO BE CARRIED OUTTEST RESULTS
1INDIVIDUAL BULB CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check the condition of the bulbs and associated bulb holderMove on to Step1. Bulbs damaged

1. Change bulbs

Op. 5540B25 DIPPED HEADLAMP BEAM (1), LH OR RH - R R

2. Front light cluster fault

2. Repair or replace front light cluster

Op. 5540B10 EXTERIOR LIGHT DIMMER RESISTOR - R+R

2DIPPED HEADLAMP ELECTRICAL CIRCUIT CHECKALL OKPROBLEMS ENCOUNTEREDACTION

Check the following, in order:

  • Dipped headlamp fuses
  • Connections between battery, engine bay control unit, dipped beam relay and bulbs;
  • Bulb earth
Move on to Step1. Component defective1. Replace defective component (in the case of a fuse, find out what caused it to blow).
2. Connections interrupted

2. Repair the connections

See E2011 DIPPED HEADLAMPS

3DIPPED HEADLAMP ELECTRICAL CIRCUIT CHECKALL OKPROBLEMS ENCOUNTEREDACTION

Check the following, in order:

  • Connections between battery, ignition switch, engine bay control unit, dipped beam relay, switch control unit and stalk unit;
  • Stalk unit earth;
Move on to Step1. Component defective1. Replace defective component (in the case of a fuse, find out what caused it to blow).
2. Connections interrupted

2. Repair the connections

See E2011 DIPPED HEADLAMPS

4STEERING COLUMN SWITCH UNIT CHECKALL OKPROBLEMS ENCOUNTEREDACTION

Check that the stalk unit is working properly: particularly the dipped beam selector

See E2011 DIPPED HEADLAMPS

Move on to StepStalk unit not working properly

Replace the steering column switch unit

Op. 5550A12 COMPLETE STALK UNIT - R+R FOR VERSIONS WITH AIR BAG

5DIPPED BEAM RELAY CHECKALL OKPROBLEMS ENCOUNTEREDACTION

Check the dipped beam relay is working properly

See E2011 DIPPED HEADLAMPS

Move on to StepDipped beam relay not working properly

Change the dipped beam relay

Op. 5550A12 COMPLETE STALK UNIT - R+R FOR VERSIONS WITH AIR BAG

6IGNITION SWITCH CHECKALL OKPROBLEMS ENCOUNTEREDACTION

Check the ignition switch is operating correctly: particularly the dipped beam relay supply

See E2011 DIPPED HEADLAMPS

Move on to StepIgnition switch fault

Repair or replace the ignition switch

Op. 5520A12 IGNITION SWITCH ASSEMBLY - R R FOR VERSIONS WITH AIR BAG

7SWITCH CONTROL UNIT CHECKALL OKPROBLEMS ENCOUNTEREDACTION

Check the following, in order:

  • Correct power supply to switch control unit
  • Check that when an earth signal is activated from the stalk unit to the switch control unit, an earth signal leaves the switch control unit to control the dipped beam relay
Move on to Step1. Connections interrupted

1. Repair the connections

See E2011 DIPPED HEADLAMPS

2. Switch control unit fault2. Replace switch control unit
8ENGINE BAY CONTROL UNIT CHECKALL OKPROBLEMS ENCOUNTEREDACTION

Check the following, in order:

  • Correct power supply to engine bay control unit;
  • Check that when an earth signal is activated from the switch control unit to the engine bay control unit, a battery voltage output is generated to control the bulbs.
Move on to Step1. Connections interrupted

1. Repair the connections

See E2011 DIPPED HEADLAMPS

2. Engine bay control unit fault2. Change engine bay control
9CHECK ON CORRECT OPERATIONALL OKPROBLEMS ENCOUNTEREDACTION
Check that the fault is no longer present

Parts & tools for this job For 2002 Fiat Ducato

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