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Home >> Subaru >> 2021 >> WRX Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 17 (Brake System) >> Stop Light Switch >> Inspection >> Check Output
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Check Output

WARNING: This page is about a different car, the 2022 Subaru WRX. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check the voltage between connector terminals.
    G10276739Courtesy of SUBARU OF AMERICA, INC.
    G14602329Courtesy of SUBARU OF AMERICA, INC.
    Terminal No. Inspection conditions Standard
    2 - 3 Apply battery voltage between terminals 1 (+) - 3 (-).
    When the end of stop light switch is pressed in to make the length (a) 3.6 mm (0.14 in) (actually a little shorter than 3.6 mm (0.14 in)), output voltage will be OFF.
    0.5 V or less
    Apply battery voltage between terminals 1 (+) - 3 (-).
    When the end of stop light switch is pulled back to make the length (a) 3.6 mm (0.14 in) (actually a little longer than 3.6 mm (0.14 in)), output voltage will be ON.
    12 V
    4 - 3 Apply battery voltage between terminals 5 (+) - 3 (-).
    When the end of stop light switch is pressed in to make the length (a) 4.5 mm (0.18 in) (actually a little shorter than 4.5 mm (0.18 in)), output voltage will be ON.
    12 V
    Apply battery voltage between terminals 5 (+) - 3 (-).
    When the end of stop light switch is pulled back to make the length (a) 4.5 mm (0.18 in) (actually a little longer than 4.5 mm (0.18 in)), output voltage will be OFF.
    0.5 V or less
  2. Replace the stop light switch assembly if the inspection result is not within the standard value.