The ULF-SBX High interface box is always fitted if the “USB/audio interface” is fitted to
the vehicle.
Although both the ULF-SBX-H and the TCU may be fitted in a vehicle at the same time,
the TCU always provides the telephone functions. The telephone functions are not avail-
able in the ULF-SBX High and the module is only installed to provide the "USB audio
interface" option.
The (TCU) and the (ULF-SBX-H) interface box control units are connected to the MOST
bus.
The ULF-SBX-H decodes the digital audio signals collected through the USB interface.
The audio files are then broadcast through the MOST.
The analog LF (low frequency) signals from the audio socket are also broadcast on the
MOST.
The audio signal is transmitted digitally on the MOST bus to the HiFi amplifier and the
amplifier distributes this signal to all the vehicle’s speakers.
The ULF-SBX High supports USB 1.1 with the following technical data:
• Maximum data rate: 12 Mbit/s
• Voltage: 5 V
• Current: 500 mA
The ULF-SBX High is located in the luggage compartment on the left-hand side.
Location of interface box (ULF-SBX-High) on rear left in luggage compartment of F01/F02
Index Explanation Index Explanation
1
Telematics control unit (TCU)
2
Interface box (ULF-SBX-High)
97
F01 Audio Systems
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