Hello everybody,

I have a 93 300CE coupe with 187,000 miles. I've owned it about 14 years and am still in love with it. It's always had trouble with the door locks being slow and the passenger side would set off the alarm if unless you unlocked that one first. The seat backs have never locked. Recently, the alarm started going off, no matter how you unlocked the doors, so I disabled it using the method in the sticky thread. It worked great.

Now the problem, the car sat for a few months and it killed the new AGM battery. NAPA was able to bring it back, but it showed there was a big drain.

I have isolated it to the Power seat module relay (position A) and the convienience module (position F). Fuse C protects the seat back locks, antena (which seamed activated with the radio off), headrests, central locking, convienience features, etc and Fuse9 also protects the convienience features relay, seat adjustment module, etc. Both Fuse C and Fuse 9 cause Relays A and F to click at same time. Fuse has more load on it. This happens with everything off, doors closed and key out of the ignition.

I wonder if it's related to disabling the alarm system or if there is a leak causing the vacuum pump to run all the time, although I don't hear it.

I would appreciate any help you could give with this. Thanks!