The battery drain is a known issue and is due to the canbus. You can update it to a newer model and it should be ok. Normally happens with OEM headunits like the RCD510 pr RNS510. Obviously happens with your aftermarket one too. I think that there is another little unit you can plug in line with the power from the canbus but I cant remember the name at the moment.
2013 Touareg V8TDi - Black, LED Interior Mods, LED Projector "VW" Door Courtesy Lights, 20" VW Mountain Rims with A/T Tyres, Pioneer SX Roof Platform with some 4x4 accessories and a whole lotta torque
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