Tech Tips
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.
| 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 |
Tech Tips
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.
| Symptom | Suspected Area | Link |
|---|---|---|
| "Skid Control (ABS/VSC/TRAC)" is not displayed on the GTS. | Brake Actuator (Skid Control ECU) Communication Stop Mode | |
| "Clearance Warning (Clearance Sonar)" is not displayed on the GTS.*1 | Clearance Warning ECU Communication Stop Mode | |
| "Air Conditioning Amplifier" is not displayed on the GTS. | Air Conditioner Amplifier Communication Stop Mode | |
| "Power Steering (EPS)" is not displayed on the GTS. | Power Steering ECU Communication Stop Mode | |
| "Spiral cable (Steering Angle Sensor)" is not displayed on the GTS. | Steering Angle Sensor Communication Stop Mode | |
| "Yaw Rate Sensor" is not displayed on the GTS.*2 | Yaw Rate Sensor Communication Stop Mode | |
| "ECM (Engine)" are not displayed on the GTS. | ECM Communication Stop Mode | |
| "Main Body" is not displayed on the GTS. | Main Body ECU Communication Stop Mode | |
| "Combination Meter" is not displayed on the GTS. | Combination Meter ECU Communication Stop Mode | |
| "Certification (Smart)" is not displayed on the GTS. | Certification ECU Communication Stop Mode | |
| "Airbag" is not displayed on the GTS. | Center Airbag Sensor Communication Stop Mode | |
| "Suspension Control (Air Suspension)" is not displayed on the GTS.*3 | Suspension Control ECU Communication Stop Mode | |
| "Headlight swivel (AFS)" is not displayed on the GTS. | AFS ECU Communication Stop Mode | |
| "Stop and Go/Start" is not displayed on the GTS.*4 | Engine Stop and Start ECU Communication Stop Mode | |
| "Four Wheel Drive Control" is not displayed on the GTS.*5 | 4WD Control ECU Communication Stop Mode | |
| "Display and Navigation (AVN)" is not displayed on the GTS. | Radio Receiver Assembly Communication Stop Mode | |
| "Blind Spot Monitor Master" is not displayed on the GTS.*6 | Blind Spot Monitor Sensor Communication Stop Mode | |
| "Accessory" is not displayed on the GTS.*7 | Bus Buffer ECU Communication Stop Mode | |
| "Panoramic View Monitor" is not displayed on the GTS.*8 | Parking Assist ECU Communication Stop Mode | |
| "DCM" is not displayed on the GTS.*9 | DCM Communication Stop Mode | |
| "Driving Support (Cruise Control-ACC)" is not displayed on the GTS.*10 | Driving Support ECU Communication Stop Mode | |
| "Front Radar" is not displayed on the GTS.*10 | Millimeter Wave Radar Sensor Communication Stop Mode | |
| "Front Camera" is not displayed on the GTS.*8 | Front television Camera Communication Stop Mode | |
| "Parking Assist Monitor System" is not displayed on the GTS.*11 | Rear television Camera Communication Stop Mode | |
| "Side Camera LH" is not displayed on the GTS.*8 | Side television Camera LH Communication Stop Mode | |
| "Side Camera RH" is not displayed on the GTS.*8 | Side television Camera RH Communication Stop Mode | |
| "Occupant Detection" is not displayed on the GTS.*12 | Restraints Occupant Classification System Module Communication Stop Mode | |
| "Head Up Display" is not displayed on the GTS.*13 | Combination Meter Mirror ECU Communication Stop Mode | |
| "Front Camera Module" is not displayed on the GTS.*10 | Front Camera Module Communication Stop Mode | |
| "Tire Pressure" is not displayed on the GTS. | Tire Pressure Monitor ECU Communication Stop Mode |
Tech Tips
*1: w/ LEXUS Parking Assist-sensor System
*2: w/ TFT Meter Type Combination Meter Assembly
*3: w/ AVS
*4: w/ Stop and Start System
*5: for AWD
*6: w/ Blind Spot Monitor System
*7: w/ Option Connector (Bus Buffer ECU)
*8: w/ Panoramic View Monitor System
*9: w/ Manual (SOS) Switch
*10: w/ Lexus Safety System +
*11: w/ Panoramic View Monitor System or Parking Assist Monitor System w/o Parallel Parking Assist Function
*12: w/ 12.3 Inch Display Type Audio and Visual System
*13: w/ Headup Display System
| 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. |