Remove the lever switches (Chapter "Instruments and auxiliary devices").
Use a test lamp to check for power in the red wire of terminal 30, through which the switch is powered.
If there is voltage, then the high beam light signal contact may be faulty. The entire element with the lever switches should be replaced.
The illustration shows the horns (arrow) with the bumper removed, which in the Audi-100 are located approximately under the right headlight.
(The full version is posted on the resource: «AUDIMANUAL.RU»)
