Central locking and electric window issues

I have a few issues regarding the electrics in my SEAT Leon Cupra 2003. I have had it for a year now. When I purchased it the rear passenger central locking failed to lock. A few months after the electric window failed to work. During this time I noticed the battery was running out if I left the car for 3 days without turning it over and still continues to do so if I don't. I noticed water ingress in the drivers foot well a few months after that but resolved this. Could these issues be down to a broken wire in door jam or am I looking potentially at something bigger. Any help would be amazing.

Asked on 21 August 2015 by Coddfather

Answered by Honest John
The ECU for these functions is inside the driver's door (as it is on most VWG cars) where is it vulnerable to eventual moisture ingress. Two ways the footwell water could be coming in. One is via the pollen filter because the cover over it has been cracked or it has not been properly fitted (I had this on a Leon 20VT Sport back in 2002). The other is a failed plastic membrane between the driver's door structure and door card. Also make sure that the drain holes in the bottoms of the doors are clear (using a wooden stick so you don't damage the paint and allow rusting).
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