GF82.85-P-3139AZ Navigation 20 Control Unit, Component Description

GF82.85-P-3139AZ Navigation 20 Control Unit, Component Description
MODEL 204
Navigation 20 retrofit (Universal Media Interface)





Shown on model 204.0
N125/2 Navigation 20 control unit (retrofit)

Location
The navigation 20 control unit is located in the front passenger footwell at the bottom on the center console.

Task
^ Receive signals
^ Relaying signals

Receive signals
^ Direct lines
^ Bluetooth(R) interface (generation 1)
^ CAN

Direct lines
- Power supply, circuit 30g
- Audio signals and data via the navigation 20 electrical connector (retrofit) (X18/72) (except vehicles with code (518) Media interface as of 1.3.2011)
- Video signals for the Audio/COMAND display (A40/8) from radio (A2) (via a Low Voltage Differential Signal (LVDS) line)
- Global Positioning System (GPS) and Traffic Message Channel (TMC) signals from the GPS antenna (retrofit) (A2/23)

Bluetooth(R) interface (generation 1)
- Bluetooth(R) signals from external devices via the integrated Bluetooth(R) module

CAN
- Control signals from the Audio/COMAND control panel (A40/9) via the telematics CAN (CAN A)
- Switch-on request and control data for the Audio/COMAND display from the radio via the telematics CAN
- Control signals of the left multifunction steering wheel button group (S110) and the right multifunction steering wheel button group (S111) from the instrument cluster (A1) via interior CAN (CAN B)
- Vehicle data for basic position finding from the front SAM control unit with fuse and relay module (N10/1) via interior CAN

Relaying signals
^ Direct lines
^ Bluetooth(R) interface (generation 1)
^ CAN

Direct lines
- Video signals to the Audio/COMAND display (via an LVDS line)
- Audio signals to the radio (except vehicles with code (518) Media interface as of 1.3.2011)
- Voice output (navigation announcements) to the center instrument panel speaker (H4/27)
- Control signals and power supply (iPod, Universal Serial Bus (USB)) to the navigation 20 electrical connector

Bluetooth(R) interface (generation 1)
- Bluetooth(R) control signals to external devices via the integrated Bluetooth(R) module

CAN
- Control signals from the Audio/COMAND control panel to the radio via telematics CAN
- Switch-on request and control data from the radio to the Audio/ COMAND display via telematics CAN

Design
The navigation 20 control unit comprises the following components:
- Navigation module with FM receiver, GPS receiver, navigation processor including map data, audio amplifier
- Bluetooth(R) module (generation 1)
- Interfaces for external audio sources
- Graphics chip for generating interfaces and map displays
The navigation 20 control unit can be flashed via the USB interface of the navigation 20 electrical connector and can be diagnosed as of generation 2.

Variants
The function scope depends on the generation (device generation) and the version (software version).
In vehicles with code (518) Media interface as of 1.3.2011, the navigation 20 electrical connector is not used as a media source for connecting external devices.
The generation and the version can be read out in the service mode on the Audio/COMAND display. Service mode is activated when the "Back" button (A40/9s2), the "Delete" button (A40/9s12) and the Audio/COMAND controller (A40/9s11) are pressed simultaneously for approx. 3 s while the "iPod" menu is active.