Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

HINT:

*: Use the Techstream.

PROCEDURE

1.

VEHICLE BROUGHT TO WORKSHOP

NEXT

2.

CUSTOMER PROBLEM ANALYSIS

(a) Interview the customer and confirm the problem.

Click here

NEXT

3.

INSPECT BATTERY VOLTAGE

Standard Voltage:

11 to 14 V

  • If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step.
NEXT

4.

CHECK DTC AND FREEZE FRAME DATA*

(a) Check and record DTCs and freeze frame data.

Chassis > Brake/EPB > Trouble Codes

(b) Clear the DTCs and freeze frame data.

Chassis > Brake/EPB > Clear DTCs

(c) Recheck for DTCs.

(1) Reconfirm the DTCs based on the recorded DTCs and freeze frame data.

Chassis > Brake/EPB > Trouble Codes

(2) Try to reproduce the problem symptoms based on the recorded DTCs and freeze frame data, and then check if the DTCs are output again.

Result

Proceed to

DTCs are not output (Problem symptom occurs.)

A

DTCs are output

B

DTCs are not output (Problem symptom does not occur.)

C

HINT:

  • Refer to Diagnostic Trouble Code Chart if any DTCs are output.
  • When DTCs indicating a CAN communication system malfunction are output, first troubleshoot and repair the CAN communication system.
B

GO TO DIAGNOSTIC TROUBLE CODE CHART

C

USE SIMULATION METHOD TO CHECK

A

5.

PROBLEM SYMPTOMS TABLE

(a) Proceed to Problem Symptoms Table.

Click here

Result

Proceed to

Fault is not listed in Problem Symptoms Table

A

Fault is listed in Problem Symptoms Table

B

B

GO TO STEP 7

A

6.

OVERALL ANALYSIS AND TROUBLESHOOTING*

(a) Refer to Terminals of ECU.

Click here

(b) Refer to Data List / Active Test.

Click here

NEXT

7.

REPAIR OR REPLACE

NEXT

8.

CONFIRMATION TEST

NEXT

END

    System Diagram
    SYSTEM DIAGRAM ...

    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 ...

    Other materials:

    Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Automatic Transaxle System: Transmission Fluid Temperature Sensor "A" Circuit Short to Battery or Open (P071015)
    DESCRIPTION The ATF temperature sensor converts the automatic transaxle fluid (ATF) temperature into a resistance value for use by the ECM. The ECM applies voltage to the temperature sensor through terminal THO1 of the ECM. The sensor resistance changes with the ATF temperature. As the temperature r ...

    Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Seat Heater System: System Description
    SYSTEM DESCRIPTION FRONT SEAT HEATER (a) By operating the refreshing seat switch (for front side), the temperature can be controlled within the range of 35 to 42°C (95 to 108°F). (b) The refreshing seat switch indicator lights indicate seat heater operating status. (c) The seat heaters of both sea ...

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

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

    © 2025 Copyright www.lexusrx.net
    0.0128