Open trunk of 2001 Mercedes CLK 430

A test light is a very inexpensive tool its great for checking fuses,I would test ALL fuses first before replace switch.

Ray since your fuse is good,check to see if you hear a click.I had a vehicle that had the same problem.You might have something caught up in there in there keeping stress on the release latch.

Do you have an opening in-between the rear seats to look in the trunk? Perhaps you can see if there is any obstructions. Flashlight and small telescope may help. If there is, try a garden hose to perhaps pull there emergency release if you can get to it. A professional locksmith may be able to get it open without doing any damage to the vehicle. If you have access to another BMZ CLK in the same year or close to it, look at the trunk locking mechanism and see if there is any way to open it through the rear seat opening. hopefully your trunk is more clear of misc. items than my wife. Also, if you can, go on u-tube and see if there is a video about opening the trunk release. Perhaps the cable came undone or broke.