Defogger (Diagnostics): Overview Lexus HS I

Scheme 8

Scheme 9

COMMUNICATION TABLE

SYSTEM DESCRIPTION

1. GENERAL The rear window defogger wires are attached to the inside of the rear window and defog the window surface quickly by pressing the rear window defogger switch on the integration control and panel assembly. The indicator light illuminates while the system is operating. The system automatically turns off after approximately 15 minutes. HINT: The rear window defogger is linked with the mirror defogger. NOTE: If the battery voltage becomes low, rear window defogger operation is canceled to prioritize supplying power to the power steering system.
2. FUNCTION OF MAIN COMPONENT Component Outline Integration Control and Panel Assembly Sends signals to the air conditioning amplifier assembly to operate the rear window defogger. Air Conditioning Amplifier Assembly Sends rear window defogger activation request signal to the integration relay. Integration Relay Receives rear window defogger activation request signal from the air conditioning amplifier assembly and supplies power to the rear window defogger wire (back window glass). Rear Window Defogger Wire (Back Window Glass) Receives power from the integration relay and heats the rear window using the rear window defogger wire (back window glass).

DESCRIPTION

When the rear window defogger switch on the integration control and panel assembly is pressed, the operation signal is transmitted to the air conditioning amplifier assembly through a LIN communication line. When the air conditioning amplifier assembly receives the signal, it turns on the integration relay to operate the rear window defogger.

Scheme 10

See also:
• REMOVAL
• REMOVAL