Toyota Yaris: Window Defogger System / System Description

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual / Vehicle Exterior / Window / Glass / Window Defogger System / System Description

SYSTEM DESCRIPTION

GENERAL

(a) The rear window defogger wire (back door glass) is attached to the inside of the rear window and defogs the window surface quickly when the rear window defogger switch is pressed. The indicator light on the switch illuminates while the system is operating. This system automatically turns off after approximately 15 minutes.

NOTICE:

If the auxiliary battery voltage becomes low, auxiliary battery load control will operate in order to ensure sufficient power is supplied to the power steering system. In this case, the window defogger system may not operate.

HINT:

The window defogger system is linked with the mirror heater function.

FUNCTION OF MAIN COMPONENT

Component	Outline
Rear Window Defogger Switch (Air Conditioning Control Assembly)	Sends signals to the air conditioning amplifier assembly to operate the window defogger system.
Air Conditioning Amplifier Assembly	Sends a window defogger system activation request signal to the power distribution box assembly.
Power Distribution Box Assembly	Receives a window defogger system activation request signal from the air conditioning amplifier assembly and supplies power to the rear window defogger wire (back door glass).
Rear Window Defogger Wire (Back Door Glass)	Receives power from the power distribution box assembly and heats the rear window using the rear window defogger wire (back door glass).

System Diagram

S..

How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT HINT: Use the following procedure to troubleshoot the window defogger system. *: Use the GTS. PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP NEXT 2...

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