Lexus NX: System Description

SYSTEM DESCRIPTION

GENERAL

(a) The rear window defogger wires are attached to the inside of the back door glass and defog the window surface quickly when the rear window defogger switch on the air conditioning control assembly is pressed. The indicator light illuminates while the system is operating. The system automatically turns off after approximately 15 minutes.

NOTICE:

If the auxiliary battery voltage becomes low, windshield deicer operation is canceled to prioritize supplying power to the power steering system.

for Power Tilt and Power Telescopic Steering Column: Click here

for Manual Tilt and Manual Telescopic Steering Column: Click here

FUNCTION OF MAIN COMPONENT

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 (defogger wire).

Back Door Glass (Defogger Wire)

Receives power from the defogger relay and heats the back door glass.

READ NEXT:

 How To Proceed With Troubleshooting

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

 Operation Check

OPERATION CHECK CHECK WINDOW DEFOGGER SYSTEM (a) Turn the power switch on (IG). (b) Check that the rear window defogger becomes warm by operating the rear window defogger switch of the air conditionin

 Problem Symptoms Table

PROBLEM SYMPTOMS TABLE NOTICE: If the auxiliary battery voltage becomes low, windshield deicer operation is canceled to prioritize supplying power to the power steering system. for Power Tilt and Powe

SEE MORE:

 How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT HINT: Use the following procedure to troubleshoot the lighting system. *: Use the Techstream. PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP NEXT 2. INSPECT AUXILIARY BATTERY VOLTAGE (a) Measure the auxiliary battery voltage with power swi

 Removal

REMOVAL CAUTION / NOTICE / HINT HINT: Use the same procedure for the RH and LH sides. The procedure listed below is for the LH side. PROCEDURE 1. PRECAUTION NOTICE: After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary

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