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Pattern 1

Terminal:
- Brake fluid level switch signal: 2Q (+) <=> ground (-)
- Washer level switch signal: 2S (+) <=> ground (-)
Oscilloscope setting: 2 V/DIV (Y), 1 ms/DIV (X), DC range

Fig 1: Washer Level Switch Signal Voltage Graph
Courtesy of MAZDA MOTORS CORP.