Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: System Description
SYSTEM DESCRIPTION
GENERAL
The rear window defogger wire (back window 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 battery voltage is low, the window defogger system may not operate. When "Operation of Electrical Items Restricted." is not displayed on the multi-information display in the combination meter assembly, check the Data List item "Battery Control Count (Body ECU)".
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HINT:
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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.
- The outside temperature is -3°C (27°F) or lower.
- Power generated by the generator assembly installed to the vehicle is stable.
- The window defogger system is linked with the mirror heater function.
FUNCTION OF MAIN COMPONENT
| Component | Outline |
|---|---|
| Radio Receiver 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 semiconductor pwr integration ECU. |
| Semiconductor Pwr Integration ECU | Receives a window defogger system 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 semiconductor pwr integration ECU and heats the rear window using the rear window defogger wire (back window glass). |
System Diagram
SYSTEM DIAGRAM Communication Table Transmitting ECU Receiving ECU Signal Communication Method Radio Receiver Assembly Air Conditioning Amplifier Assembly Rear window defogger switch ...
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
Use the following procedure to troubleshoot the window defogger system.
*: Use the Techstream.
PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
NEXT ...
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
- For your information
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- Instrument cluster
- Operation of each component
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- Interior features
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- When trouble arises
- Vehicle specifications
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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