battery discharge problem

I have a 2003 Mercedes E500 that has developed an intermittent battery discharge problem. I have unplugged both of the front seat modules to insure that they are not the issue. But that did not solve it. So I have now unplugged fuse f41 which is the central gateway control unit. Is that the correct one to disconnect the audio gateway? With that fuse unplugged i am now getting a check engine light and a SRS warning light. So am a bit confused here to say the least. Also is there somewhere i can find a fuse chart for this car. Mine is missing and it shocks me the manual does not have this. Thanks for any help!!!! I have ordered an amp probe to use in helping me but it has not arrived yet.