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:

 Dtc Check / Clear

DTC CHECK / CLEAR CHECK DTC (a) Turn the power switch off. (b) Connect the Techstream to the DLC3. (c) Turn the power switch on (IG). (d) Turn the Techstream on. (e) Enter the following menus: Body Electrical / (desired system) / Trouble Codes. Body Electrical > Master Switch > Trouble Codes B

 Foreign Object is Attached on Tip of Front Speed Sensor RH (C1235,C1236,C1238,C1239,C1275-C1278)

DESCRIPTION When foreign matter adheres to a speed sensor tip or speed sensor rotor, these DTCs are stored. The presence of foreign matter can be judged when an abnormal waveform is received from a sensor. These DTCs may also be detected when a malfunction occurs in the connector terminals or wire h

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