Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

NOTICE:

If the battery voltage is low, the climate control seat system may not operate. When "Operation of Electrical Items Restricted." is displayed on the multi-information display in the combination meter assembly, inspect the battery, referring to On-vehicle Inspection for the charging system.

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HINT:

  • Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
  • Inspect the fuses and relays related to this system before inspecting the suspected areas below.
Climate Control Seat System

Symptom

Suspected Area

Link

Seat blower volume is low (front LH seat)

Check that the air ducts are not disconnected or damaged

Seat cushion climate control blower assembly LH

-

Seatback climate control blower LH

-

Seat blower volume is low (front RH seat)

Check that the air ducts are not disconnected or damaged

Seat cushion climate control blower assembly RH

-

Seatback climate control blower RH

-

Seat blower volume does not change (front LH seat)

Refreshing seat switch (for front side)

-

Seat cushion climate control blower assembly LH

-

Seatback climate control blower LH

-

Air conditioning amplifier assembly

-

Seat blower volume does not change (front RH seat)

Refreshing seat switch (for front side)

-

Seat cushion climate control blower assembly RH

-

Seatback climate control blower RH

-

Air conditioning amplifier assembly

-

Climate control seat system does not operate

Refer to the "Climate Control Seat System does not Operate".

    How To Proceed With Troubleshooting
    CAUTION / NOTICE / HINT HINT: Use this procedure to troubleshoot the climate control seat system. *: Use the Techstream. PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP NEXT ...

    Terminals Of Ecu
    TERMINALS OF ECU CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (a) Disconnect the J43 air conditioning amplifier assembly connector. (b) Measure the voltage and resistance according to the value(s) in th ...

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    DESCRIPTION If an ECU or sensor is not displayed on the CAN Bus Check screen of the Techstream and some ECUs and sensors repeatedly appear and disappear from the screen when the CAN main bus lines are normal (there is no open, short, short to +B or short to GND in the main bus lines), there may be a ...

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    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

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