Technical Information
Not only does the Universal Bluetooth
TM
Hands-Free System offer a means to wirelessly
integrate a mobile phone into the vehicle, it also can be diagnosed using the DISplus or
GT1.
The control module should always be coded to the specific vehicle that it is installed into
to ensure optimum system performance. Coding of the module can be done using the
DISplus or GT1 with CD33 or higher installed.
The ULF control module contains several controllers that provide the following functions:
1. Bluetooth
TM
Control Circuit
The Bluetooth
TM
control circuit is physically connected to the Bluetooth
TM
antenna.
It establishes the connection between the Bluetooth
TM
mobile phone and the
vehicle, de-scrambles the incoming call/signal from the phone, scrambles the
outgoing signal from the microphone for transmission to the phone, plus controls
all communication to paired Bluetooth
TM
devices.
2. Hands-free Control Circuit
The hands-free control circuit in the ULF controls the input/output of audio
frequency signals in hands-free mode. The hands-free mode is designed for
full-duplex transmission. This means the user can listen and speak
simultaneously. Voice transmission takes place via a microphone located in the
interior of the vehicle.
Pressing and holding the send/receive button until an audible beep is
heard will activate the integrated voice recognition system and place the system
into a hands-free mode.
3. Audio Output Control
The incoming signal from the Bluetooth
TM
phone is processed, sent through the
radio and to the speakers.
4. Audio Input Control
The outgoing audio received from the vehicle microphone is processed and
transmitted to the Bluetooth
TM
phone.
5. I/K-Bus Interface
The interface in the ULF control module for the I/K-bus controls the procedure for
transmitting and receiving data telegrams via the I/K-bus in connection with other
components on the bus.
15
Bluetooth
TM