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My 2010 VW CC is having a parasitic drain issue and I've isolated the problem to one of the fuses which is for the rear window raisers and for the central locking system. If I keep this fuse out overnight, I can start my car but if I leave it in and lock my car, it drains within a couple of hours and I have to jump my car. The problem with leaving this fuse out and calling it a day is that you're unable to lock the car. How do I begin to troubleshoot this issue? Where exactly is the "central locking system"?

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You start by isolating each component connected to that fuse / circuit and finding out which one is causing the drain.

A process of elimination and it helps if you approach this logically ie disconnect all and reconnect one component at a time.

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