Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Problem Symptoms Table

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Power Source & Network / Networking / Can Communication System / 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.
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.
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Result List of How to Proceed with Troubleshooting

Symptom	Suspected Area	Link
The result of "How to Proceed with Troubleshooting" is "Open in Bus 1 Main Bus Line".	Open in Bus 1 Main Bus Line
The result of "How to Proceed with Troubleshooting" is "Short in Bus 1 Lines".	Short in Bus 1 Lines
The result of "How to Proceed with Troubleshooting" is "Short to +B in Bus 1 Line".	Short to +B in Bus 1 Line
The result of "How to Proceed with Troubleshooting" is "Short to GND in Bus 1 Line".	Short to GND in Bus 1 Line
The result of "How to Proceed with Troubleshooting" is "Open in Bus 2 Main Bus Line".	Open in Bus 2 Main Bus Line
The result of "How to Proceed with Troubleshooting" is "Short in Bus 2 Lines".	Short in Bus 2 Lines
The result of "How to Proceed with Troubleshooting" is "Short to +B in Bus 2 Line".	Short to +B in Bus 2 Line
The result of "How to Proceed with Troubleshooting" is "Short to GND in Bus 2 Line".	Short to GND in Bus 2 Line
The result of "How to Proceed with Troubleshooting" is "Open in Bus 3 Main Bus Line".	Open in Bus 3 Main Bus Line
The result of "How to Proceed with Troubleshooting" is "Short in Bus 3 Lines".	Short in Bus 3 Lines
The result of "How to Proceed with Troubleshooting" is "Short to +B in Bus 3 Line".	Short to +B in Bus 3 Line
The result of "How to Proceed with Troubleshooting" is "Short to GND in Bus 3 Line".	Short to GND in Bus 3 Line
The result of "How to Proceed with Troubleshooting" is "Open in Bus 4 Main Bus Line".	Open in Bus 4 Main Bus Line
The result of "How to Proceed with Troubleshooting" is "Short in Bus 4 Lines".	Short in Bus 4 Lines
The result of "How to Proceed with Troubleshooting" is "Short to +B in Bus 4 Line".	Short to +B in Bus 4 Line
The result of "How to Proceed with Troubleshooting" is "Short to GND in Bus 4 Line".	Short to GND in Bus 4 Line
The result of "How to Proceed with Troubleshooting" is "Open in Bus 5 Main Bus Line".	Open in Bus 5 Main Bus Line
The result of "How to Proceed with Troubleshooting" is "Short in Bus 5 Lines".	Short in Bus 5 Lines
The result of "How to Proceed with Troubleshooting" is "Short to +B in Bus 5 Line".	Short to +B in Bus 5 Line
The result of "How to Proceed with Troubleshooting" is "Short to GND in Bus 5 Line".	Short to GND in Bus 5 Line

HINT:

Refer to How to Proceed with Troubleshooting for the Bus Check procedure.
The suspected communication stop area can be determined based on the ECU or sensor that was not displayed in CAN Bus Check and by referring to the following table.

Communication Stop Mode Table

Symptom	Suspected Area	Link
"Skid Control (ABS/VSC/TRAC)" is not displayed on the Techstream.	Brake Actuator (Skid Control ECU) Communication Stop Mode
"Clearance Warning (Intuitive Parking Assist)" is not displayed on the Techstream.*1	Clearance Warning ECU Communication Stop Mode
"Air Conditioning Amplifier" is not displayed on the Techstream.	Air Conditioner Amplifier Communication Stop Mode
"Power Steering (EPS)" is not displayed on the Techstream.	Power Steering ECU Communication Stop Mode
"Spiral cable (Steering Angle Sensor)" is not displayed on the Techstream.	Steering Angle Sensor Communication Stop Mode
"Yaw Rate Sensor" is not displayed on the Techstream.*2	Yaw Rate Sensor Communication Stop Mode
"ECM (Engine)" is not displayed on the Techstream.	ECM Communication Stop Mode
"Main Body" is not displayed on the Techstream.	Main Body ECU Communication Stop Mode
"Combination Meter" is not displayed on the Techstream.	Combination Meter ECU Communication Stop Mode
"Certification (Smart)" is not displayed on the Techstream.	Certification ECU Communication Stop Mode
"Airbag" is not displayed on the Techstream.	Center Airbag Sensor Communication Stop Mode
"Suspension Control (Air Suspension)" is not displayed on the Techstream.*3	Suspension Control ECU Communication Stop Mode
"Headlight swivel (AFS)" is not displayed on the Techstream.*4	AFS ECU Communication Stop Mode
"Four Wheel Drive Control" is not displayed on the Techstream.*5	4WD Control ECU Communication Stop Mode
"Display and Navigation (AVN)" is not displayed on the Techstream.	Radio Receiver Assembly Communication Stop Mode
"Blind Spot Monitor Master" is not displayed on the Techstream.*6	Blind Spot Monitor Sensor Communication Stop Mode
"Panoramic View Monitor" is not displayed on the Techstream.*7	Parking Assist ECU Communication Stop Mode
"DCM" is not displayed on the Techstream.*8	DCM Communication Stop Mode
"Front Radar" is not displayed on the Techstream.	Millimeter Wave Radar Sensor Communication Stop Mode
"Parking Assist Monitor System" is not displayed on the Techstream.	Rear Television Camera Communication Stop Mode
"Occupant Detection" is not displayed on the Techstream.	Restraints Occupant Classification System Module Communication Stop Mode
"Head Up Display" is not displayed on the Techstream.*9	Combination Meter Mirror ECU Communication Stop Mode
"Front Camera Module" is not displayed on the Techstream.	Front Camera Module Communication Stop Mode
"Tire Pressure" is not displayed on the Techstream.	Tire Pressure Monitor ECU Communication Stop Mode

HINT:

*1: w/ Intuitive Parking Assist System
*2: w/ TFT Meter Type Combination Meter Assembly
*3: w/ AVS
*4: w/ Automatic Headlight Beam Level Control System
*5: for AWD
*6: w/ Blind Spot Monitor System
*7: w/ Panoramic View Monitor System
*8: w/ Manual (SOS) Switch
*9: w/ Headup Display System

DTC Combination Table

Symptom	Suspected Area	Link
Although CAN communication is currently normal, ECUs connected to the bus 1, bus 2, bus 3, bus 4 and bus 5 store CAN communication DTCs.	The probable part for which communication is interrupted can be determined using DTC Combination Table and comparing the DTCs output from ECUs connected to the CAN communication system.

System Description

SYSTEM DESCRIPTION BRIEF DESCRIPTION (a) The Controller Area Network (CAN) is a serial data communication system for real time application. It is a vehicle multiplex communication system which has a h ...

How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT PRECAUTIONS WHEN TROUBLESHOOTING NOTICE: Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with ...

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System Description

How To Proceed With Troubleshooting

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