My 98 E320 is a Japanese import to Canada.
It has the above "option". It is apparently designed to reduce RF interference, but what it does is make the RF portion of the FOB unusable.
I have been using the IR since acquiring the car, which works fine, just not as convenient as a working RF to unlock the doors.
I am wondering what other folks who have imported MB from Japan do about this issue.
I will not spend $400 at the Stealership for a new fob.