3239372 - E3510 RADIO - Functional description (Sedan)

Functional description

The radio P20 is supplied directly (pins 4 and 7 of connector A) by the battery via the line for fuse F10 of junction unit B1 and maxifuse J/B1 of B5 up to 2/99 or B99 from 2/99. It receives a supply when the ignition is switched on (INT) (pin 3 of connector A) via the line for fuse F1 of the junction unit B1 . With the side lights switched on, the supply reaches pin 6 of connector A by means of the line coming from the switch for the steering column switch unit H5 , protected by the controls illumination fuse B11 up to 2/99 or fuse F4 of the additional fuse box B98B from 2/99; the radio controls are therefore lit up when the lide lights are switched on. Pin 8 of connector A, on the other hand, is earthed ( C20 ). Pin 5 of connector A is connected to the control unit P22 which controls the aerial built into the heated rear windscreen. The control unit P22 is then connected to the radio by means of the specific aerial lead.

Connector B sends out cables carrying signals to the speakers:

• pins 5 and 6 to the left front speakers P35 and P45 ,
• pins 3 and 4 to the right front speakers P36 and P46 ,
• pins 7 and 8 to the left rear speakers P30 and P40 ,
• pins 1 and 2 to the right rear speakers P31 and P41 .