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July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Manual 1st

WARNING: This page is about a different car, the 2016 Mazda CX-3. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Blower Fan Speed Control Signal Waveform (Manual 1st)
G10910317Courtesy of MAZDA MOTORS CORP.

Climate control unit terminal 

Oscilloscope setting 

Vehicle condition