A way to test the IR remote (or any IR remote for that matter) is to use the LCD viewfinder on your digital camera or video camera. The sensors inside the camera can "see" IR activity from a remote and project that activity in the display. Obviously, this only works with IR devices, not RF.

It helped me when I was troubleshooting the remote for my 97 e300d.

.....Dan

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99 e300
98 e300
90 Suburban 1500 4x4
92 ZR-1
04 Tahoe 4x4
05 Scag 52" zero turn
97 e300 - totaled on black ice
84 300SD - gave to a friend
85 300TDT Euro - SOLD to my little bro