My '83 300SD sunroof is feeling uncooperative. It makes a single tiny click when the switch is depressed in either direction, and will not move. However, it opens and closes just fine with 12V manualy applied to the connector pins nearest the motor. I have cleaned the sunroof dash switch contacts well. Does anyone have a schematic for this circuit? Where is the relay located? I've seen some reference to it being in the main fuse/relay block under the hood, but my relay chart is missing from the block.

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'83 300SD powered by B100