Do you leave the key in the ignition overnight??

The key has 2 types of unlocking signals...radio frequency range should be 25+- feet.

The infrared signal range is 3-4 feet & must be aimed at receiver.

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator