Hi all -- long story short:

My 1989 300SE (118K miles) has developed these symptoms which have so far baffled everyone:

1. Unlocking the trunk doesn't unlock anything else. I discovered this when I unlocked and opened the trunk and set off the car alarm; unlocking the driver's door turned it off.

2. Locking the passenger's door by key locks/unlocks that door only, not the trunk or other doors.

3. Driver's door locks/unlocks the trunk and other doors normally; however, the courtesy light doesn't work. (Coincidence?)

Any ideas? Thanks!

__________________
Tony