NOTE:

The wiper deicer does not operate when the ambient temperature becomes 5°C (41°F) or more.
The wiper deicer operates with the rear window defogger at the same time.
It is possible to perform a forced operation if you keep holding the rear window defogger switch for 3 seconds or more.

Symptoms	Inspection order
Wiper deicer does not operate.	Check the fuse. Check the wiper deicer relay. Check the wiper deicer switch. Check the heat wire. Check the wiring harness. Check body integrated unit.

NOTE:

Wiper deicer system can be customized using the Subaru Select Monitor, when the customize setting {A/C ECM setting} of the body integrated unit is set to With.
Set the system using the Rr Defogger op. mode, and setting will be the same as rear defogger system setting.

System name

Initial setting

Customize setting

Rr Defogger op. mode

OFF after 15 min.

Continuous operation⁽¹⁾

⁽¹⁾	When one of the following conditions occurs, continuous operation is suspended and turned off after 15 minutes.

Ambient temperature at 5°C (41°F) or more continues for 10 seconds.
Malfunction occurs on ambient sensor.
Vehicle speed of 15 km/h (9 MPH) or less continues 15 minutes (OFF when conditions are met)
Malfunction occurs in CAN communication.
Battery voltage remains at 10 V or less for 30 seconds.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Check System