No need to remove the panel, just gently pry the switch out from the top and bottom. The switch receives 12V and a ground as an input and it swaps these between the two wires that run to the sunroof motor for forward and reverse.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine