The connection
D75 receives the direct
supply (pin 1) from the battery via the line of fuse F18 of the
junction unit B1.
Receives the ignition-dependent supply (15/54)
(pin 5) via the line of fuse
F5 of the junction unit B1.
Pin 3 of connection
D75 is earthed C34.
Pins 4 and 8 of connection
D75 represent
the predisposition for the microphone P26.
The MUTE signal for decreasing the volume
during a telephone call is sent to the radio system via pin 2 for
connection
D75.
The DSP amplifier
P70 receives the MUTE
signal and the supply signals for the speakers from pins 6 and 7
of connection D75.