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Check Switch

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.