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It's safe to say that someone has played around with this wiring loom and I want to restore it back to standard.

I was hoping someone might be able to advise what each wire behind the head unit is.
It seems I have 2 red/whites, a yellow/red, a brown, a grey/blue, a grey/white and a blue/white.

I recently installed a pioneer touch screen radio but if I leave it plugged in over night, it drains the battery even with the ignition off and remote cable unplugged.


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Electrical wiring Automotive exterior Bumper Cable Electrical supply
 

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Based on my experience I would see if they've wired in an aerial booster thingy - check which wire it's been connected to. If it's a constantly live feed it'll drain the battery. I think the how-to stickies on here have a guide to the cable colours.
 

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2002 MK4 1.8t GTi AUM
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Standard colours are 2 x red are permanent live, yellow is ignition live, brown is earth the rest I'm unsure of but the should only be connected to the same colours on the standard loom and not have spurs off to other colour wires.
 
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