Radio with auto pilot system, component description

P54.30-9801-06

Shown on model 212.0

A2/56 Radio with auto pilot system

A40/8 Audio/COMAND display

Location

The radio with auto pilot system is located in the center console.

Task

The radio with auto pilot system has the following tasks:

 Central operating unit for the entertainment and communication systems integrated into the vehicle

 Reading in the controls and input signals

 Evaluation of input factors

 Activation of output media and system components

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Central operating unit for the entertainment and communication systems integrated into the vehicle

The radio with auto pilot system provides the user with a structured and uniform interface for the following system components:

- Audio (Radio/CD/DVD/AUX)

- Communication (telephony)

- Navigation (arrow navigation in instrument cluster (A1) and 2-D map display in the Audio/COMAND display)

- Voice control system (VCS [SBS]) (with code (511) Audio 50 APS with DVD changer)

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Reading in the controls and input signals

The input factors are read in via the following connections:

 Direct line

 CAN

 Media Oriented System Transport (MOST)

Direct line

The radio with auto pilot system is equipped with the following direct connections:

- Circuit 30g

- Circuit 31

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- Wake-up for MOST (bi-directional)

- Electrical connection for AUX connector (X39/45) for external audio equipment, up to 31.5.2011 in glove compartment, as of 1.6.2011 in stowage compartment (telephone compartment) below the center armrest (without code (518) Media Interface)

- FM 1, AM, CL and KEYLESS-GO antenna amplifier (A2/18)

- Antenna amplifier FM 2 and DAB (A2/19)

- Bluetooth antenna (A2/91)

- Multifunction antenna (A28/11)

- Hands-free system microphone (A67b1)

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CAN

- The radio with auto pilot system is an interior CAN (CAN B) subscriber.

- The radio with auto pilot system is a subscriber of the telematics CAN (CAN A).

MOST

Control and audio signals from the following control units:

- Sound system amplifier control unit (N40/3)
(with code (810) Sound system)

- Digital Audio Broadcasting control unit (N87/3)
(with code (537) Digital radio)

- Media interface control unit (N125/1)
(with code (518) Media interface)

Evaluation of input factors

The input factors are processed in the radio with auto pilot system.

Activation of output media and system components

- Audio output (speaker) (without code (810) Sound system)

- Switch voltage for mobile phone cradle (A34/15) via the Bluetooth module (A34/7) (with code (386) Comfort telephony)

- Video output: low voltage differential signal (LVDS) line, transmits picture and video signals from the radio with auto pilot system to the audio/COMAND display

P82.60-6571-06

Body

Shown on code (511) Audio 50 APS with DVD changer

1 "ON" button

2 "Skip" function keys

3 Left button panel

4 Right button panel

5 DVD/CD ejector and load button

A2/56 Radio with auto pilot system

Function

The status of the buttons of the button panels at the radio with auto pilot system is read in and provided to the central computer. The button operations are processed further in the central computer and forwarded via MOST, the telematics CAN and the interior CAN to the other system components in the form of messages.

If the ON button on the radio with auto pilot system is pressed, the radio with auto pilot system switches on. The volume is regulated for each audio source set by turning the ON button. The function keys in the left-hand button panel are used to switch over to the audio source selected by the user.

Variants

The radio with auto pilot system is available in the following variants:

- Audio 50 with single DVD drive
(with code (525) MB Audio 50 APS radio) (without VCS [SBS])

- Audio 50 with DVD changer
(with code (511) Audio 50 APS with DVD changer) (with VCS [SBS])

Diagnosis

The radio with auto pilot system is the diagnosis gateway for all MOST subscribers. The diagnostic communication takes place between the radio with the auto pilot system and the front SAM control unit with fuse and relay module (N10/1) via the interior CAN. The diagnostic communication between the front SAM control unit with fuse and relay module and the diagnostic connector (X11/4) connected to the "IS tester" is performed via the diagnostic CAN (CAN D).