For some reason, the mechanism is not activating the ‘Close’ or ‘Down’ position (probably related to the actuator wheel).

Here’s my understanding/figuring to date: 1) the roof has only three terminal positions (Up, Closed or Down, and Back), 2) the motor knows only two directions (forward and backward), 3) the Closed/Down position is actually an intermediate position that must be controlled mechanically (via actuator wheel and microswitch), 4) the (white) adjustment knob simply calibrates the ‘end’ position of the cycle.

What’s happening is that the intermediate (ie fully Closed) position is not being activated and the motor continues to the end of its cycle. If the roof is Up (one end of the cycle), pressing the Down switch will lower the roof and slide it Back (to the other end of the cycle). Conversely, if the roof is Back, pressing Close will slide the roof forward and then lift it Up (same thing in reverse). Electrically, the Close and Down switch positions send the same signal (from the schematic).

We need to find out why the intermediate Close position is not being activated (ie stopping the motor). If the associated relay and switch are ok, then the problem must be on the mechanical side (actuator wheel slipping, broken …?). Before you reinstall the motor, it would be a good idea to test this part of the mechanism.

I have a couple of other jobs to do first (refinish wheels and replace fuel injectors), then I’ll tackle the sliding roof. In the meantime, Good Luck and I look forward to your contribution on this one. So will a lot of others, who don’t yet realize it!

Regards,
Barrie