3315677 - E3580 PREPARATION FOR CELLULAR TELEPHONE - Functional description

Functional description

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 at C34 , while pins 6 and 7 supply the signal to the loudspeaker P46 , connector B, while connector A is for the car radio (see E3510 - RADIO). 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.