Pattern 1

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

Fig 1: Washer Level Signal Waveform
Courtesy of MAZDA MOTORS CORP.