Actually it is a well thought out, clever design. MB owners can never accidentally lock their keys in the car.

I suggest installing remote keyless entry for convenience. Just make sure it is wired correctly so that it works in conjunction with the ATA alarm system.

Many people have remote entry units installed incorrectly, which interferes with the ATA operation forcing some people to simply disable the alarm (bad useless idea)

A keyless entry system should not interfere with or impair any other function.

I'm strugling to re-wire my remote unit to incorporate the window close feature with the remote. I will post it when I figure it out. I installed them in my 1990 300E and wifes 92 300E as well.

Regards,
Acky