Bose - amp 3510 C5

I have a Bose - amp 3510 C5 - AUDI A6 OEM Bose Amplifier 265 030a 3510 C5 (found as "Bose R12" on some sites) I think the pinouts for 25-pin plug are the attached but I don't know what's connected to 4-pin plug.

Any diagram / service book / pinout details ?...
 

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I have a Bose - amp 3510 C5 - AUDI A6 OEM Bose Amplifier 265 030a 3510 C5 (found as "Bose R12" on some sites) I think the pinouts for 25-pin plug are the attached but I don't know what's connected to 4-pin plug.

Any diagram / service book / pinout details ?...

Check the resistance between the pin 3 and ground, mostly it will be for system on/remote . if the resistance is 5k-20k, mostly it will control/switching on the amp. or you need to connect to the positive voltage.