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Check Switch

Remove the wiper deicer switch, and measure the switch resistance.

Fig 1: Measuring Wiper Deicer Switch Resistance

Courtesy of SUBARU OF AMERICA, INC.

TERMINALS STANDARD RESISTANCE

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

Replace the wiper deicer switch if faulty.