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Head Light sensor on Digital Dashes

Hi gang,

I have a little problem with the light sensor on the left side of the
instrument cluster.  The green "turn on your headlights" symbol keeps
lighting up in the bright sunshine, so I suspect the sensor's not working.

Is this sensor a photo diode or light sensitive resistor?  The Bentley is
indicating by symbol that it is a diode.  Thought I'd ask if any one has
any experience repairing this.



Tony Lum                                  1987 5000CS Turbo Quattro
Berkeley, California, U.S.A.                1985 4000CS Quattro
Audi Owner/Driver/Mechanic by Necessity ;^)   1980 5000S Sedan
QCUSA Member #6885                            1987.5 Coupe GT