Toyota CH-R Service Manual: System Description

SYSTEM DESCRIPTION

GENERAL

(a) The rear window defogger wire 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.

HINT:

  • If both of the following conditions are met after approximately 15 minutes from when the window defogger system was activated, the window defogger system continues to operate up to approximately 45 minutes. If the following conditions are not met, the window defogger system stops operating immediately.
    1. The outside temperature is -3°C (27°F) or lower.
    2. The vehicle speed is 45 km/h (28 mph) or more.

NOTICE:

If the battery voltage becomes low, window defogger system operation is canceled to prioritize supplying power to the power steering system.

FUNCTION OF MAIN COMPONENTS

Component

Outline

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 defogger relay.

Defogger Relay

Receives a window defogger system activation request signal from the air conditioning amplifier assembly and supplies power to the back door glass (rear window defogger wire).

Back Door Glass (Rear Window Defogger Wire)

Receives power from the defogger relay and heats the rear window using the back door glass (rear window defogger wire).

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    Operation Check
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