In the 14-100 section in the CD manual... when it states "control unit" is it referring to the ECU in the passenger footwell? YES

Also, when it refers to position 1 or position 2 on the "official" tester dial do those correspond to the socket number on the X11 diagnostic socket? NO. I THINK THE OFFICIAL TESTER IS A BREAKOUT BOX THAT PLUGS INTO THE CABLE TO THE ECU. WHEN THE DIAL IS TURNED TO DIFFERENT POSITIONS, YOU CAN MEASURE CURRENT ON SPECIFIC CIRCUITS.

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe