Test with a multimeter

Button

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Now: Always-connected pair: pins 1 and 2

CircuVanta 6000 counts · auto range DCAUTO•)))HOLDFUSE− HOLD LIGHT OFFV⎓V~Ω•)))FmA⎓ mA400 mACOMVΩ Pin 1 (side A) 1 A1 Pin 2 (side A) 2 A2 Pin 3 (side B) 3 B1 Pin 4 (side B) 4 B2
Pin 1: Pin 1 (side A) (A1) Pin 2: Pin 2 (side A) (A2) Pin 3: Pin 3 (side B) (B1) Pin 4: Pin 4 (side B) (B2)

Red probe Not connectedBlack probe Not connected

Hold the probe and drag it to the tip of a leg. Tapping works too: first pick the probe, then the leg.

Set the range to continuity.

Measure step by step

On a four-pin button, the pins are always connected in pairs inside (side A and side B); when you press, the two sides join. The continuity range beeps when there is a path between two points.

  1. 1Always-connected pair: pins 1 and 2
  2. 2A to B when released (pins 1 and 3)
  3. 3A to B while pressed (pins 1 and 3)