Lexus RX (RX 350L, RX450h) 2016-2022 Repair Manual: Diagnosis System

DIAGNOSIS SYSTEM

DESCRIPTION

(a) Blind spot monitor data and Diagnostic Trouble Codes (DTCs) can be read from the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use the Techstream to check for malfunctions and to perform repairs.

CHECK DLC3

(a) Check the DLC3.

Click here

DIAGNOSIS FUNCTION

(a) The blind spot monitor system displays an error message on the multi-information display to inform the driver that the system is unavailable either temporarily or due to a malfunction.

  • When the system is unavailable temporarily:

    Multi-information display displays "BSM not available".

  • When the system is unavailable due to a malfunction:

    Multi-information display displays "Check BSM System".

(b) If the RCTA function is not operating correctly, the blind spot monitor system displays the RCTA icon on the multi-display assembly*1 or accessory meter assembly*2 to inform the driver of the malfunction

  • *1: for 8 Inch Display
  • *2: for 12.3 Inch Display

Malfunctioning Item

Detection Condition

Malfunction Indication

Suspected Area

System Malfunction Indication

  • Blind spot monitor sensor LH is malfunctioning
  • Blind spot monitor sensor RH is malfunctioning
  • Blind spot monitor sensor LH communication abnormal

Check for DTCs

(1) Malfunction Indication

*A

for 12.3 Inch Display

*B

for 8 Inch Display (w/ Panoramic View Monitor System)

*a

System Malfunction Indication

*b

Communication Malfunction Indication

*c

RCTA Icon

*d

When panoramic view screen not displayed

*e

When panoramic view screen displayed

-

-

ABNORMALITY HISTORY

HINT:

The abnormality history for a blind spot monitor sensor can be displayed or cleared.

(a) Check abnormality history

(1) Connect the Techstream to the DLC3.

(2) Turn the engine switch on (IG).

(3) Turn the Techstream on.

(4) Turn the blind spot monitor system on.

(5) Enter the following menus: Body Electrical / Blind Spot Monitor Master or Blind Spot Monitor Slave / Utility / BSM Master Abnormal History or BSM Slave Abnormal History.

Body Electrical > Blind Spot Monitor Master > Utility

Tester Display

BSM Master Abnormal History

Body Electrical > Blind Spot Monitor Slave > Utility

Tester Display

BSM Slave Abnormal History

(6) Check the results displayed for the abnormality history check.

HINT:

  • If "Yes" is displayed, check the suspected area column for each item.
  • Abnormality history is stored only for the blind spot monitor sensor for which an abnormality has been detected.
  • If "No" is displayed, refer to Problem Symptoms Table.

    Click here

Abnormality History Table

Tester Display

Item Explanation

Suspected Area

History of Module Blockage

History of blind spot monitor sensor detection problems due to snow, rain, etc. on the bumper

  • Check if a bumper that is not compatible with the blind spot monitor sensors (such as a non-genuine part) is installed
  • Check if any foreign matter is attached to the bumper
  • Check if any foreign matter is present between the bumper and sensors

History of Low Voltage

History of low supply battery voltage from battery to the blind spot monitor sensor

Power Source Circuit

Click here

History of High Voltage

History of high supply battery voltage from battery to the blind spot monitor sensor

History of Low Temperature

History of low temperature for the blind spot monitor sensor

  • Check the outside temperature
  • Check if any foreign matter is attached to the blind spot monitor sensors and their surrounding areas

History of High Temperature

History of high temperature for the blind spot monitor sensor

(b) Clearing abnormality history

(1) Connect the Techstream to the DLC3.

(2) Turn the engine switch on (IG).

(3) Turn the Techstream on.

(4) Turn the blind spot monitor system on.

(5) Enter the following menus: Body Electrical / Blind Spot Monitor Master or Blind Spot Monitor Slave / Utility / BSM Master Abnormal History or BSM Slave Abnormal History.

Body Electrical > Blind Spot Monitor Master > Utility

Tester Display

BSM Master Abnormal History

Body Electrical > Blind Spot Monitor Slave > Utility

Tester Display

BSM Slave Abnormal History

(6) Clear the abnormality history.

    Terminals Of Ecu
    TERMINALS OF ECU BLIND SPOT MONITOR SENSOR LH (MASTER) Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition X2-4 (OMIL) - X2-10 (BLGD) G - W-B Oute ...

    Dtc Check / Clear
    DTC CHECK / CLEAR CHECK DTC (a) Connect the Techstream to the DLC3. (b) Turn the engine switch on (IG). (c) Turn the blind spot monitor system on. (d) Turn the Techstream on. (e) Enter the following m ...

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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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