Most Easterly Pandas said:

Sub should be switching of when the headunit does. Is it an OEM unit or aftermarket

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Most Easterly Pandas said:

It's not been fitted properly then. What are you relaying it to

This will be the cause of your drain if it doesn't shut down with the headunit, at least you've found your issue though

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Andy Monty said:

im going to stick my neck out and as i told Steven Im going on the big bold assumption that when OEM wired its switched via the CAN network

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The radio P20 is supplied directly (4 of connector A) from the battery via the line for fuse F51 of the Body Computer M1.

Pin 8 of connector A is earthed.

Pins 1 and 3 of connector A connect to the CAN that connects the radio P20 to the Body Computer M1 (pins 5 and 20 of connector D) and to the other system nodes.

The Body Computer M1 is connected to the radio controls on the steering wheel via the clock spring D47: pin 35 of connector D supplies a reference earth to pin 7 of D47; pin 52 of connector D of M1 receives signals from the pushbuttons located to the left of the steering wheel while pin 50 of connector D of M1 receives signals from the pushbuttons on the left of the steering wheel.

The Body Computer M1 - connector G - is supplied directly from the battery via a line protected by maxifuse F2 of the engine compartment control unit B1; its ignition-controlled supply (INT) is received at pin 2 of connector D; pin 10 of connector H or M1 supplies the Body Computer with a reference earth.

The amplifier in the subwoofer P49 receives a direct supply from the battery - at pin 3 - via the line for fuse F67 of the fuse box in the boot B45; pin 7 of amplifier P49 is earthed.

Pin 6 of P49 is connected to the radio P20 - pin 5 of connector A - which supplies a positive enablement signal to turn on the amplifier (the aerial supply).

The amplifier P70 is supplied directly (1 of connector B) from the battery via the line for fuse F51 of the Body Computer M1.

Pin 2 of connector B is earthed.

Pin 8 of connector B of P70 is connected to the radio P20 - pin 5 of connector A - which supplies a positive enablement signal to turn on the amplifier (the same supply as for the aerial).

The cables with signals for the amplifier P70 (pins 3, 4, 9, 10 connector A and pins 1, 2, 7, 8 connector B) and for the subwoofer P49 leave connector B of P20.

The following cables with signals for the speakers leave connector A of P70;

- pins 6 and 14 to the left front speakers P35 and P45 (or P36 and P46 on right hand drive versions);

- pins 10 and 11 to the right front speakers P36 and P46 (or P35 and P45 on right hand drive versions);

- pins 4 and 5 to the left rear speaker P30;

- pins 12 and 13 to the right rear speaker P31;

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