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Magnet Switch

Using a circuit tester, check there is continuity between S terminal and M terminal, and between S terminal and ground.

Also, check that there is no continuity between M terminal and B terminal.

G13868424Courtesy of SUBARU OF AMERICA, INC.
Terminals Standard
Terminal S - terminal M 1 Ω or less
Terminal S - Ground 1 Ω or less
Terminal M - terminal B 1 MΩ or more