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Inspection Using an Oscilloscope (Reference) Pattern 1

WARNING: This page is about a different car, the 2014 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

LF control unit: L (+) <==> body ground (-)
Oscilloscope setting: 2 V/DIV (Y), 100 ms/DIV (X), DC range

Fig 1: LF Control Unit Signal Waveform
Courtesy of MAZDA MOTORS CORP.