Check Switch

WARNING: This page is about a different car, the 2005 Subaru Outback and 2005 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.

Remove the wiper deicer switch and measure the switch resistance.

Fig 1: Removing Wiper Deicer Switch And Measuring Switch Resistance

Courtesy of SUBARU OF AMERICA, INC.

SWITCH POSITION TERMINAL SPECIFICATION

Switch position	Terminal No.	Standard
OFF	1 and 2	More than 1 MΩ
ON		Less than 1 Ω

Replace the wiper deicer switch if faulty.