M-ASK Power Supply (M-ASK-BO User Interface)

Functional description, see BMW Technology:
TIS -> Document -> SI Technology -> Enter SBT Number
SBT number: 840103004

Brief description
The M-ASK (Multi Audio System Controller) is the central control unit of the communications systems. The following functions are integrated in the M-ASK:
- M-ASK user interface (motherboard)
- M-ASK gateway
- M-ASK navigation system (if a navigation system is fitted)
Different audio system can be combined with the M-ASK. As standard, the stereo system is fitted (no external amplifier).

Audio program
The audio systems are divided into 3 levels:
- Stereo system
- HiFi system (additional analog amplifier)
- Top HiFi system (additional Top HiFi amplifier connected via MOST)
The audio systems differ in that various sound pressures can be achieved or there is improved system linearity. The stereo system consists of 6 loudspeakers; the HiFi system or top-hifi system consists of 10 loudspeakers and various additional amplifiers. The central bass speakers are located under the front seats.

Service mode
Proceed as follows to call up the Service mode:
- Call up the start menu
- Press and hold down the controller for at least 10s
- Turn the controller 3 positions to the right
- Turn the controller 3 positions to the left.
- Turn the controller 1 position to the right
- Turn the controller 1 position to the left.
- Turn the controller 1 position to the right
- Press the controller once.
To exit the Service mode, press the menu key.

MOST
The M-ASK is the MOST master controller. It forms the gateway between K-CAN and MOST bus.