Rear Spoiler Doesn’t Work - ‘97 Boxster

[TNT79Bronco]

Spoiler doesn’t extend at speed, nor does it work with the switch. The spoiler light comes on in the dash at speed. Swapped in another spoiler mechanism, thinking it might be a bad mechanism, and no luck there. All fuses and relays have been replaced.

HOWEVER, with the manual switch (by fuse box) unplugged, and I connect the rear wiring harness to the spoiler unit, I can hear the relay clock, and it will raise the spoiler about 1/2” and stop. If I unplug and plug back in, it will go up another 1/2”. I kept doing this (duh!!!) and got a fully extended spoiler.

I figured out how to “hot wire” it to retract it, and then extend it again by swapping the (-) and (+) on the green/yellow and blue/green leads on the spoiler motor harness. All works smoothly.

I tested the switch by the fuse panel and it passed.

Also, I tried to make heads or tails of the wiring diagram. I’m more mechanical oriented than automotive electronics. I just got a headache!

Any advice on how to troubleshoot? Not really sure how the wiring is designed to make it function.