I have a 02 c320. just recently my drivers side door locking system clicks numerous times when you lock and unlock. only in the drivers door. also my drivers seat wont move fwd and back. also headrest wont go up and down. sometimes i try to pull up on lock on door and it wont come up. now my battery is draining. i checked voltage and with car off the battery is draining. i recently had the whole window switches replaced at a MB service dept. Any suggestions.

 

Hmmmmm......I wonder if this could be the infamous "seat module" problem.

Sounds like it might be.