Switch Assembly

1. Return spring check

   Make sure the plunger returns to its original position immediately after pressed-in then released.

   Fig 1: Checking Return Spring

   Courtesy of SUBARU OF AMERICA, INC.
2. Magnet switch continuity test

Be sure there is continuity between the terminals S and M, and between terminal S and ground. Use a circuit tester.

Also check to be sure there is no continuity between terminal M and B.

Terminal / Specified resistance: 

S - M / Less than 1 Ω 

S - Ground / Less than 1 Ω 

M - B / More than 1 MΩ 

Fig 2: Checking Continuity Between Terminals S And M, And Between Terminal S And Ground

Courtesy of SUBARU OF AMERICA, INC.