No headlights.

[Wes. A. Sroka]

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Hello Forum,
I have lost low beam headlights on my '89 200q.  Just like that.  Drove the car home with all lights ok, then one
hour later I am leaving and no low beams come on.
I've checked the bulbs, the fuses and next day the headlight switch (had to take steering wheel off).
I looked for headlight relay but this model does not use it.
Any ideas what may be wrong?  Also what is a location of front light control unit (it is after the fuses #10&11).
Appreciate any help.   wesso
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