Volkswagen Media Device Interface (MDI) USB Specifications

Overview of connectors on USB connection
1 –  Data in, (here output)
2 –  Data clock
3 –  Voltage supply, terminal 31
4 –  Data out (here input)
5 –  Not assigned
6 –  Voltage supply, terminal 30
7 –  LF audio signal, right, positive
8 –  Control line, positive, switched from radio
9 –  LF audio signal, negative
10 –  LF audio signal, left, positive
11 –  Not assigned
12 –  Not assigned

Overview of connectors on USB connection

mdi_usb_connector_N91-107911 –  Data in, (here output)
2 –  Data clock
3 –  Voltage supply, terminal 31
4 –  Data out (here input)
5 –  Not assigned
6 –  Voltage supply, terminal 30
7 –  LF audio signal, right, positive
8 –  Control line, positive, switched from radio
9 –  LF audio signal, negative
10 –  LF audio signal, left, positive
11 –  Not assigned
12 –  Not assigned

General notes

Thanks to the Multimedia control unit -J650- analogue (via AUX-IN entry) as well as digital (via USB or iPod entry) audio contents can be played via the radio unit or the radio navigation system. Units connected via USB or iPod connections can also be operated via the radio unit or the radio navigation system. ID3-TAG and titles also appear on the radio unit or radio navigation system displays.

Note! Since the display ability of ID3 tags and titles on the radio unit or radio navigation system displays depend on the type of audio files used, refer to the Owner’s Manual of the radio unit or radio navigation system and to the Owner’s Manual of your MP3 player or iPod.

The multimedia system control unit -J650- provides an audio input (AUX-IN), an USB input, and an iPod connection (power supply, signal and AUDIO-IN) as an interface. To connect the mobile unit to the USB or iPod interface of the multimedia system control unit -J650-, a relevant specific adapter cable is used. A storage compartment for mobile unit is integrated in the multimedia system control unit -J650-. Charging is possible via USB or iPod connection.

Note! If no 1DIN slot is available in the vehicle, the “multimedia system control unit” can also be installed separately. The user can although have access to the universal interface (Mitsumi socket) via a Mitsumi-Mitsumi extension. For this purpose, the Mitsumi socket must be integrated in the inside of the vehicle. Wire length of Mitsumi-Mitsumi extension must not exceed 1500 mm.

7 thoughts on “Volkswagen Media Device Interface (MDI) USB Specifications”

  1. The VW part number for the “Mitsumi-Mitsumi extension” is:
    000.051.447

    This is the cable that is included in the “MDI Retrofit” kit, it plugs into the “Mitsumi” socket on the MDI box, and acts just like an extension cable so you can then plug in the iPod or USB or AUX “dongle” piece to the end.

  2. Can someone help….fitted a MDI unit to my RNS510, works great, but for some reason get ‘poor’ ‘fuzzy’ sound from ipods via the ipod lead? any ideas?

  3. I got Media In Kit in my car. I want to install Aux-In port now. As we know, Aux in has 3 wires. From the diagram, 2 are connected to port 9(negative) and 10(positive), where is the other(ground) goes?.

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