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Inspection Using an Oscilloscope (reference)

WARNING: This page is about a different car, the 2017 Mazda CX-9. However, it is still accessible from the selected car via links, so may be relevant.
Oscilloscope setting: Terminal
Ignition Shift lever position Vehicle speed Corner ultrasonic sensor (LH) Ultrasonic sensor (LH) Ultrasonic sensor (RH) Corner ultrasonic sensor (RH)
ON (engine off or on) R position 0-15 km/h {0-9.3 mph} or less E-F A-B C-D G-F
Fig 1: Parking Sensor Control Module Oscilloscope Waveform
G11434832Courtesy of MAZDA MOTORS CORP.