Hi guys, now I need your expert help again!

My outside rear view mirror´s doesn't work as expected, left one not at all !
I have changed the control knob and the left Mirror unit so my conclusion is that the Control unit is gone!?
Anyone know where the control unit for the rear view mirror is located on a '93 Audi V8 4,2L with power seats? It's NOT located where the picture shows in the ETKA!


Any suggestions is appreciated

Chris