Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Certification ECU Communication Stop Mode

NOTICE:

• Before measuring the resistance of the CAN bus, turn the engine switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
• After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

  Click here

• Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.

  Click here

• After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.
• DTC check procedure: Turn the engine switch on (IG) and wait for at least 20 seconds.
• After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed.

  Click here

• Inspect the fuses for circuits related to this system before performing the following procedure.
• Before replacing the certification ECU (smart key ECU assembly), refer to the smart access system with push-button start (for Start Function) Precaution.

  Click here

HINT:

• Operating the engine switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.
• Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

Center Airbag Sensor Communication Stop Mode

DESCRIPTION Detection Item Symptom Trouble Area Center Airbag Sensor Communication Stop Mode Either condition is met: "Airbag" is not displayed on the CAN Bus Check screen of the Techs ...

Combination Meter ECU Communication Stop Mode

DESCRIPTION Detection Item Symptom Trouble Area Combination Meter ECU Communication Stop Mode Either condition is met: "Combination Meter" is not displayed on the CAN Bus Check screen ...

Other materials:

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Front Seat Cushion Heater: Removal
REMOVAL CAUTION / NOTICE / HINT The necessary procedures (adjustment, calibration, initialization or registration) that must be performed after parts are removed and installed, or replaced during front seat cushion heater removal/installation are shown below. Necessary Procedures After Parts Removed ...

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Power Window Control System: Data List / Active Test
DATA LIST / ACTIVE TEST DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be dis ...