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 (Click here).
| Symptom | Suspected Area | See page |
|---|---|---|
| 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 One Side of Bus 1 Branch Line". | Open in One Side of Bus 1 Branch Line | |
| The result of "How to Proceed with Troubleshooting" is "Open in Bus 2 Main Bus Line". | Open in Bus 2 Main Bus Line (Includes central gateway ECU branch lines and terminating resisters) | |
| 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 One Side of Bus 2 Branch Line". | Open in One Side of Bus 2 Branch 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 One Side of Bus 3 Branch Line". | Open in One Side of Bus 3 Branch Line |
Refer to How to Proceed with Troubleshooting for the Bus Check procedure.
| Symptom | Suspected Area | See page |
|---|---|---|
| "Skid Control (ABS/VSC/TRAC)" is not displayed on the GTS. | Skid Control ECU Communication Stop Mode | |
| "Clearance warning (Clearance Sonar1)" is not displayed on the GTS. | Clearance Warning ECU Communication Stop Mode | |
| "Air Conditioning Amplifier" is not displayed on the GTS. | Air Conditioning 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 | |
| "ECM (Engine)" is not displayed on the GTS. | ECM Communication Stop Mode | |
| "Main Body" is not displayed on the GTS. | Main Body ECU Communication Stop Mode | |
| "Hybrid Vehicle Control" is not displayed on the GTS. | Hybrid Vehicle Control 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 | |
| "Display and Navigation (AVN1)" is not displayed on the GTS. | Audio Receiver Assembly Communication Stop Mode | |
| "DCM" is not displayed on the GTS.*1 | DCM Communication Stop Mode | |
| "Headlight swivel (AFS)" is not displayed on the GTS. | AFS ECU Communication Stop Mode | |
| "Blind Spot Monitor Master" is not displayed on the GTS.*2 | Blind Spot Monitor Sensor Communication Stop Mode | |
| "Driving Support (Cruise Control-ACC)" is not displayed on the GTS.*3 | Driving Support ECU Communication Stop Mode | |
| "Front Radar" is not displayed on the GTS.*3 | Millimeter Wave Radar Sensor Communication Stop Mode | |
| "Front Camera Module" is not displayed on the GTS.*3 | Front Camera Module Communication Stop Mode |
*1: w/ Manual (SOS) Switch
*2: w/ Blind Spot Monitor System
*3: w/ Lexus Safety System +
| Symptom | Suspected Area | See page |
|---|---|---|
| Although CAN communication is currently normal, ECUs connected to the bus 1, bus 2 and bus 3 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. |