Magnetic Switch

Inspect for continuity between terminals (S) and (M) using an ohmmeter. If there is no continuity, replace the magnetic switch. See Fig 1.
Inspect for continuity between terminal (S) and the body using an ohmmeter. If there is no continuity, replace the magnetic switch. See Fig 2.
Verify that there is no continuity between terminals (M) and (B) using an ohmmeter. If there is continuity, replace the magnetic switch. See Fig 3.

Fig 1: Inspecting For Continuity (1 Of 3)

Courtesy of MAZDA MOTORS CORP.

Fig 2: Inspecting For Continuity (2 Of 3)

Courtesy of MAZDA MOTORS CORP.

Fig 3: Inspecting For Continuity (3 Of 3)

Courtesy of MAZDA MOTORS CORP.