Inspection Using An Oscilloscope (Reference)

WARNING: This page is about a different car, the 2016 Mazda CX-5. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: LF Control Unit Voltage Graph

Courtesy of MAZDA MOTORS CORP.

LF control unit: H (+) ↔ body ground (-)
Oscilloscope setting: 2 V/DIV (Y), 100 ms/DIV (X), DC range