Lexus RX (RX 350L, RX450h) 2016-2022 Repair Manual: Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

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.
  • When an open circuit or frozen indication is displayed by the self-check function, check for DTCs and troubleshoot according to each inspection procedure.
General

Symptom

Suspected Area

Link

System does not operate at all

Proceed to "Clearance Warning ECU Power Source Circuit"

CAN communication system

Clearance warning ECU assembly

System cannot be turned off

CAN communication system

Clearance warning ECU assembly

Sonar Function

Symptom

Suspected Area

Link

Frozen indication is displayed in self-check function.

Proceed to "Sensor Frozen Indication (Dirty or Frozen)"

Combination meter assembly (shift selection) operates normally, but detection operates when shift lever is in P, or detection does not operate when shift lever is in any position other than P (front sonar)

CAN communication system

Clearance warning ECU assembly

Combination meter assembly (shift selection) operates normally, but detection operates when shift lever is not in R, or does not operate with shift lever in R (rear sonar)

CAN communication system

Clearance warning ECU assembly

Combination meter assembly (speedometer) operates normally, but detection does not operate when vehicle speed meets operation condition, or detection operates when vehicle speed does not meet operation condition (front sonar)

CAN communication system

Clearance warning ECU assembly

Buzzer Function

Symptom

Suspected Area

Link

Sonar detection operation is normal but buzzer does not sound

Check that the temporary mute function is not operating

-

Proceed to "No. 1 Clearance Warning Buzzer Circuit"

Proceed to "No. 2 Clearance Warning Buzzer Circuit"

Clearance warning ECU assembly

Display Function

Symptom

Suspected Area

Link

Detection operation is normal but clearance sonar indicator does not illuminate

CAN communication system

Combination meter assembly (LED): Perform Active Test (Indicat. Clearance Sonar LCD)

Combination meter assembly

Clearance warning ECU assembly

Detection operation is normal but all sonar displays do not appear on multi-information display and multi-display

CAN communication system

Clearance warning ECU assembly

Detection operation is normal but sonar displays do not appear on multi-information display

CAN communication system

Combination meter assembly

Clearance warning ECU assembly

Detection operation is normal but sonar displays do not appear on the screen display (on the multi-display assembly)

CAN communication system

Multi-display assembly

Radio receiver assembly

Clearance warning ECU assembly

Detection operation is normal but sonar displays do not appear on the cooperated display (on the multi-display assembly)*1

CAN communication system

Multi-display assembly

Parking assist ECU

Clearance warning ECU assembly

Detection operation is normal but sonar displays do not appear on the cooperated display (on the multi-display assembly)*2

CAN communication system

Multi-display assembly

Rear television camera assembly

Clearance warning ECU assembly

Detection operation is normal but sonar displays do not appear on the cooperated display (on the headup display)*3

CAN communication system

Headup display (meter mirror sub-assembly)

Clearance warning ECU assembly

  • *1: w/ Panoramic View Monitor System
  • *2: w/ Parking Assist Monitor System
  • *3: w/ Headup Display System
    Calibration
    CALIBRATION NOTICE: When any of the following parts have been replaced, perform adjustment shown in the following table. If not, the intuitive parking assist system may not operate correctly. ADJUST I ...

    Terminals Of Ecu
    TERMINALS OF ECU CLEARANCE WARNING ECU ASSEMBLY (a) Disconnect the J38 clearance warning ECU assembly connector. (b) Measure the voltage and resistance on the wire harness side connector according to ...

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

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