Functional description, see BMW Technology:

TIS -> Document -> SI Technology -> Enter SBT Number

SBT number: 650604101

Service mode

Proceed as follows to call up the Service mode:

• Terminal 30g ON
  
• Switch off the radio
  
• Switch on the radio again
  
• Within 8s for a duration of 8s, press the button for manual station-search function
  
• The radio switches into the Service mode