Lexus RX (RX 350L, RX450h) 2016-2026 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.
| Symptom | Suspected Area | Link |
|---|---|---|
| System does not operate at all | Intuitive parking assist system | |
| CAN communication system | | |
| Clearance warning ECU assembly | | |
| Blind spot monitor system | | |
| System cannot be turned off | CAN communication system | |
| Clearance warning ECU assembly | |
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| Symptom | Suspected Area | Link |
|---|---|---|
| Detection function operates when the operating conditions are not met | EFI system | |
| Clearance warning ECU assembly | | |
| Detection function operates when vehicle is not within the required speed range (speedometer not malfunctioning) | CAN communication system | |
| Skid control ECU | | |
| Clearance warning ECU assembly | |
| Symptom | Suspected Area | Link |
|---|---|---|
| Intelligent clearance sonar system is normal but buzzer operation is intermittent | 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 | | |
| Combination meter assembly | |
| Symptom | Suspected Area | Link |
|---|---|---|
| While the ICS system is operating, no ICS notifications are displayed on the multi-information display. | CAN communication system | |
| Clearance warning ECU assembly | | |
| Combination meter assembly | | |
| While the ICS system is operating, no ICS notifications are displayed on the headup display.* | CAN communication system | |
| Clearance warning ECU assembly | | |
| Meter mirror sub-assembly | | |
| "Parking Support Brake Malfunction Visit Your Dealer" is displayed | Combination meter assembly | |
| Clearance warning ECU assembly | | |
| "Parking Support Brake Unavailable" is displayed | Check that no foreign matter is attached to the ultrasonic sensors. | - |
| Steering angle neutral point (Intelligent clearance sonar system registration) | | |
| CAN communication system | | |
| Combination meter assembly | | |
| Clearance warning ECU assembly | | |
| ICS does not operate when there is a possibility of a collision (Warning message "Parking Support Brake Unavailable" not displayed) | Check the installation of the ultrasonic sensors (front) | |
| Check the installation of the ultrasonic sensors (rear) | | |
| Adjust the installation of the ultrasonic sensors as necessary. | | |
| Ultrasonic sensors (front) | | |
| Ultrasonic sensors (rear) | | |
| Clearance warning ECU assembly | | |
| ICS control operates when there is no possibility of a collision | Check the installation of the ultrasonic sensors (front) | |
| Check the installation of the ultrasonic sensors (rear) | | |
| Adjust the installation of the ultrasonic sensors as necessary. | | |
| Ultrasonic sensors (front) | | |
| Ultrasonic sensors (rear) | | |
| Clearance warning ECU assembly | | |
| ICS control cannot be turned off (ICS OFF indicator does not illuminate) | Combination meter assembly (LED): Perform Active Test (Indicat. ICS OFF LCD) | |
| Steering pad switch assembly | | |
| Clearance warning ECU assembly | | |
| ICS OFF indicator blinks | If "Yes" is displayed for the Data List item "BSM Radar Communication Invalid History", the blind spot monitor system may be malfunctioning. | |
| Check that no foreign matter is attached to the ultrasonic sensors. | - | |
| Steering angle neutral point (Intelligent clearance sonar system registration) | |
- *: w/ Headup Display System
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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