Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual: Open in Bus 2 Main Bus Line

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: Drive the vehicle at a speed of 60 km/h (37 mph) or more for 20 seconds or more. And drive the vehicle with the dynamic radar cruise control system operated for 4 seconds or more.
• 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

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.

Check Bus 1 Line for Short to GND

DESCRIPTION There may be a short circuit between one of the CAN bus lines and GND when there is no resistance between terminal 23 (CA1H) of the network gateway ECU and terminal 4 (CG) of the DLC3, or ...

Check Bus 2 Lines for Short Circuit

DESCRIPTION There may be a short circuit between the bus 2 main lines and/or bus 2 branch lines when the resistance between terminals 18 (CA4H) and 17 (CA4L) of the network gateway ECU is below 54 Ω. ...

Other materials:

Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual > Height Control Sensor: Installation
INSTALLATION PROCEDURE 1. INSTALL REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY RH (a) Temporarily install the rear height control sensor sub-assembly RH with the 2 nuts. Torque: 5.0 N·m {51 kgf·cm, 44 in·lbf} (b) Engage the guide. (c) Connect the rear height control sensor sub-assembly ...

Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual > Safety Connect System: Emergency Call Switch Illumination Circuit
WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Safety Connect System. Click here Inspect the fuses for circuits rel ...