Magnetic Switch

WARNING: This page is about a different car, the 2004 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

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.