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Alfa Romeo 156 Factory Service Manual (1997-2002)16 · Fault diagnosis
16 · Diagnostics

K90 Instrument lights not working

Make
Alfa Romeo
Model
156 Factory Service Manual
Year
1997–2002
Section
Instruments › K90 Instrument lights not working
Fault diagnosisK90 Instrument lights not working

K90 Instrument lights not working

With the key turned on and the side lights on, the instruments do not light up

StepTest procedureResultAction
0PRELIMINARY CHECKS

Check operation of the lighting dimmer

OK

Move onto step 1

The instruments are properly lit, but the intensity is not adjustable

Move onto step (see K91)

1CHECKING BULBS

Check the condition of individual light bulbs on the various instruments.

OK

Move onto step 2

Rev counter and speedometer bulbs faulty

End of diagnosis

Check control bulbs faulty

End of diagnosis

Central instrument bulb faulty

End of diagnosis

2INSTRUMENT SUPPLY CIRCUIT CHECK

Check, in order:

  • ignition-operated service fuse
  • instrument power supply

(Wiring diagram E2530 INSTRUMENT LIGHTING ).

OK

Move onto step 3

Component defective
  • Replace the component involved (if a fuse is involved, search for the cause of the problem)

End of diagnosis

Connections broken
  • Restore the connections (

End of diagnosis

3CHECK CORRECT OPERATION

Check that the fault is no longer present

OK

End of diagnosis

Fault persists

Incorrect selection of diagnostic procedure

Parts & tools for this job For 1997 Alfa Romeo 156

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