Volkswagen DSP Amplifier Activation

"Entschuldigung für das Englische."

But this information could be helpful for those like me who have a VW DSP Sound System and want to install a new car stereo.

Normally, aftermarket car stereo units are not able to send the correct commands to the CAN-bus in order to activate the external amplifier.
"For this reason, some companies sell special CAN-bus adapters that are capable of doing this."
But if you follow this procedure, it is not necessary.

1) Disconnect the old head unit.
2) Disconnect the battery for at least 20 minutes (disconnecting just the negative terminal is sufficient).
3) Connect the new head unit.
4) Connect the battery.
After this, the amplifier enters a special mode where it is turned on by the "key-on" CAN-bus message and turned off by the "key-off" CAN-bus message, and it no longer requires the activation message sent by the original head unit.
I have tested this on my 2012 Skoda Superb with a 12-channel DSP sound system, and it works.

Max.