Hi i have a 2004 (53) plate audi a3 that had a single din standard audi stereo in, I've since then got myself a audi navigation plus (G) edition and all was fine all i had to do was buy a adaptor from e-bay so all was fine, or so i thought quite recently my car battery has been dying and this has only ever happened since the stereo was installed i have a 6 month old audi s3 battery so i know there is no problems with that. what i have noticed is even tho when i turn the car off and take the key out the stereo turns itself off....... but the fan for the stereo still comes on and off every couple of mins while its off. also if u press the botton on the stereo it will turn back on without needing the key..... can someone help? i think its something to do with the radio still getting power for the fan to turn on even tho its off. can some help please?