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Using the button doesn't solve the problem, it's just a workaround.
You need to get this working automatically because the rear end will get squirrelly at speed w/o the spoiler.
It may be a wheel speed sensor, a wiring issue, a motor issue or retractor microswitch, or even the DME.
If the calibration light (spoiler light on dash) comes on at startup, but goes out once you hit 4MPH, you can pretty much rule out the speed sensor and DME, indicating a wiring or microswitch issue.
But don't rely on manual operation, it's inherently unsafe. Don't find this out the hard way.
Cheers!
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