Setting radio and auto pilot system to loudspeaker system, testing electrical system, radio (RD) - AD82.60-P-2000-03A

MB APS radio and navigation operating unit in models 129, 140, 210 up to 31.12.97 

Setting: 

1. Switch on ignition.
2. Switch off radio and navigation operating unit (APS) (A2/29).
3. Call up "LOUDNESS"  menu: Press RDS button (2) and station storage button 5 (3) at the same time, keep button pressed down together and press the "ON" button (1). The LOUDNESS menu appears in the display (5).
4. Select existing system using the cursor button (6) and confirm by pressing the rotary knob (7).
   Fig 1: Setting Radio And Auto Pilot System To Loudspeaker System, Testing Electrical System, Radio (RD)

   Courtesy of MERCEDES-BENZ OF NORTH AMERICA.