Locks don't work from from wireless key the battery of which works fine. Is it a fuse or more ?
Your key might need reprogramming to the central locking ECU or it might be a blown fuse or module.
you should check the age of your battery (by the knock-off labels on the top of your battery)...and when you get a new one be sure to "refresh" the ground connection of the 1/0 black battery cable to ground with a coarse wirebrush...before putting it back together~ NEW battery with reNEWed ground should make your problems vanish~...tada~
OMG both terrific answers thanks so much ! I'll let you know what I discover.
Looking for a Used CLK-Class in your area?
CarGurus has 1,528 nationwide CLK-Class listings starting at $2,950.
Search Mercedes-Benz CLK-Class Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Mercedes-Benz CLK-Class Experts