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Inhibitor Switch

WARNING: This page is about a different variant/trim than selected.

The inhibitor switch is installed in the control valve. TCM detects the range position based on the ON/OFF signal of each range output by the inhibitor switch, and performs various controls. The following list shows the inhibitor switch signal (INH1 - 4) and range position patterns.

  INH1 INH2 INH3 INH4
P (1)     (1)
R   (1)    
N     (1) (1)
D (1) (1) (1)  
(1) Inhibitor switch ON

If the range position is judged as P or N, TCM outputs the signal (PN signal) to permit starter drive. In R or D range, starter drive is inhibited to ensure safety.

In addition, if the position is judged as R range, TCM turns back lamp relay output to ON and turns the back lamp on.

Fig 1: Identifying Inhibitor Switch
G08260296Courtesy of SUBARU OF AMERICA, INC.