I have a 1991 300CE W124. I have a few items which I think are related to the Convenience Control Module:

1) My driver's (L) window will not go all the way down with the auto-mode stopping about 10cm from fully open (always the same position). If I hold the switch it will go all the way down. It did begin fully opening a few times only to resume not fully opening but now it stops at a different position (but again, now always stopping at this new position). At this stopped position, the auto-mode will not work until the window moves down about another 10-15cm and then will resume auto mode or it will fully open if I hold the switch. Passenger (R) door seems to work fine from the inside. Note: driver's window motor has been replaced before I acquired the car.

2) I discovered the open and close feature with the key. It worked last night after driving the car at the driver's door but not the passenger door. (I didn't try the trunk.) This morning... Nothing at the doors or trunk but appearantly the key must be held in the lock position first. After learning this from another member I tried it and the windows did open and close from the driver's door and trunk. Still nothing from the passenger door. Haven't tried the sunroof but I have read that it gets in the act, too, returning to the pop-up position if that is where was when the car was locked. Don't want to run my battery down for now so I have stopped messing with it.

3) The driver and passenger door window does not open slightly when respective the door is opened and close when the door is closed. I am not completely sure that this is supposed to happen, but that is what I have read. (Other 300CE owners... Do your windows do this?)

4) The passenger door key lock does not seem to arm/disarm the anti-theft alarm system. At least, when I lock with the driver's door, and unlock with the passenger door, it sets off the alarm. Trunk will arm/disarm system.

Question: Is the interior light supossed to illuminate when the car is unlocked? Mine doesn't but seems like it should. (Again, other 300CE or W124 owners... Your cars do this?)

MY thoughts: I think there may be a glitch there somewhere with the passenger door switch at the key/door handle, that is causing the alarm and window issue. (?) Make sense? Can the door switch be accessed without taking the door panel off? Had a member suggest disconnecting the alarm and leaving it disconnected. (Haven't tried it yet. Not sure I want to.) Could the alarm module have some issues? (Less likely, I think)

Any advise, thoughts, comments on these issues or if they are all related is greatly appreciated. Any way to test/recondition the convenience module? From what I have read it may not be completely solid state and my have relays in it. Any sources to get a new or used one reasonalbly priced?