Switch Assembly

Using a circuit tester (set to "ohm"), check that there is continuity between terminals S and M, and between terminal S and ground.

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

Terminal/Resistance: 

S - M/1 Ω or less 

S - Ground/1 Ω or less 

M - B/1 MΩ or more 

Fig 1: Identifying Terminal S, Terminal B And Terminal M

Courtesy of SUBARU OF AMERICA, INC.