Radio P20 is supplied directly (pin 4 of connector A) from the battery via the line for fuse F23 of the engine compartment junction unit B1 .The radio P20 receives an ignition-operated (INT) power supply (pin 7 of connector A) via the line for fuse F49 of the junction unit under the dashboard B2 .Pin 8 of connector A is earthed.The amplifier P70 receives a direct supply from the battery - at pin 31 - via the line for fuse F54 of the fuse box in the boot B45; pin 2 of amplifier P70 is earthed.Pin 6 of P70 is connected via a line to radio P20 - pin 5 of connector A - which supplies a positive signal to enable the amplifier to be switched on.The cables with signals for the speakers leave from connector B of P20; these signals are sent to the BOSE amplifier P70 which controls the actual speakers:- pins 5 and 6 of P20 to pins 7 and 19 of P70 and to the left front speakers P35 and P45 - pins 31 and 32 of P70- pins 3 and 4 of P20 to pins 8 and 20 of P70 and to the right front speakers P36 and P46 - pins 26 and 27 of P70;- pins 7 and 8 of P20 to pins 9 and 21 of P70 and to the left rear speakers P30 and P47 - pins 4 and 16 of P70;- pins 1 and 2 of P20 to pins 10 and 22 of P70 and to the right rear speakers P31 and P48 - pins 5 and 37 of P70;The other signals leaving the BOSE amplifier P70 control the specific speakers:- centerfill P32 - pins 3 and 15 of P70;- subwoofer in the rear parcel shelf P49 - pins 11, 12 and 25 of P70; the subwoofer P49 is also supplied via the line for fuse F61 of the fuse box in the boot B45.The "ambient" microphone located in the front courtesy light G10 - connector E - is connected to pins 29 and 30 of P70.The aerial P25 is connected to the radio by means of the special coaxial cable.