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Manual 7th

WARNING: This page is about a different car, the 2016 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Blower Fan Speed Control Signal Voltage Graph (Manual 7th)
G10953292Courtesy of MAZDA MOTORS CORP.

Climate control unit terminal 

Oscilloscope setting 

Vehicle condition