A damn good solution for a problem that we all have: continuous current in the C4.. Open cover over the fuses driver’s side left: You can see a wire harness coming to the right of the BSI module. There is a 5-6mm thick bright red cable in there – this cable does not end in the BSI but is attached to other cables with fabric tape above it. At the end of the cable sits a grey cable shoe. This red cable comes out in the engine compartment under the fuse box and even lies at +12 V; all of it andings feht under the safety box the fuse to supply this cable with voltage: disconnect battery! Unlock all plugs from the safety module, detach 12 V cable from the safety module, detach brackets at the bottom left and top to lift the safety module up. Below there are some fuses. On the 3rd contact the thick red cable arrives from the interior and is even located at the safety plug. Only a suitable fuse from the friendly supply and permanent current is located inside the C4