Check Switch
Remove the wiper deicer switch, and measure the switch resistance.
Courtesy of SUBARU OF AMERICA, INC. RESISTANCE SPECIFICATION CHART
| Switch position |
Terminal No. |
Standard |
| OFF |
1 and 2 |
1 MΩ or more |
| ON |
Less than 1 Ω. |
Replace the wiper deicer switch if faulty.