Join Date: May 2010
Vehicle: 2005 SLK 55; 2005 SLK 350
Other Toys: Several past R170's
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That's correct -- if you connect the clamp end of your test light to +12V, and touch one of the pins above, and the switch is closed, the test light will glow.
I believe you said A) starting from fully closed and latched, then B) start opening by pulling the red switch back, C) the latches unlatched and the boot lid raised, but D) roof motion never started. So your failure is at point D. Start by checking S69/1 (should be open), S69/2 & S69/3 (should be open), and S69/9 (should be closed).