LEXUS PARKING ASSIST-SENSOR SYSTEM PROBLEM SYMPTOMS TABLE
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.
| Symptom | Suspected Area | See page |
|---|---|---|
| System does not operate at all (self-check function does not operate) | ECU power source circuit (w/ Side Monitor System) | |
| Clearance warning ECU assembly power source circuit (w/o Side Monitor System) | ||
| Back sonar or clearance sonar switch assembly circuit | ||
| Parking assist ECU (w/ Side Monitor System) | ||
| Clearance warning ECU assembly (w/o Side Monitor System) | ||
| ECU does not operate when clearance sonar main switch is turned on or off | Read value using the intelligent tester (EEPROM status) | |
| Parking assist ECU (w/ Side Monitor System) | ||
| Clearance warning ECU assembly (w/o Side Monitor System) |
| Symptom | Suspected Area | See page |
|---|---|---|
| Freeze condition is displayed as a result of self-check | Remove ice, mud or snow from the ultrasonic sensor | - |
| Open circuit in front sensors is displayed as a result of self-check | No. 1 ultrasonic sensor (FL sensor) malfunction | |
| No. 1 ultrasonic sensor (FR sensor) malfunction | ||
| Parking assist ECU (w/ Side Monitor System) | ||
| Clearance warning ECU assembly (w/o Side Monitor System) | ||
| Open circuit in rear sensors is displayed as a result of self-check | No. 1 ultrasonic sensor (RL sensor) malfunction | |
| No. 1 ultrasonic sensor (RR sensor) malfunction | ||
| No. 1 ultrasonic sensor (RRC sensor) malfunction | ||
| No. 1 ultrasonic sensor (RLC sensor) malfunction | ||
| Parking assist ECU (w/ Side Monitor System) | ||
| Clearance warning ECU assembly (w/o Side Monitor System) | ||
| Detection operation operates even when vehicle speed is more than 13 km/h (8 mph) | CAN communication system (for LHD) | |
| CAN communication system (for RHD) | ||
| Parking Assist ECU (w/ Side Monitor System) | ||
| Clearance warning ECU assembly (w/o Side Monitor System) |
| Symptom | Suspected Area | See page |
|---|---|---|
| Detection operation is normal but sonar displays do not appear on multi-information display | CAN communication system (for LHD) | |
| CAN communication system (for RHD) | ||
| Parking assist ECU (w/ Side Monitor System) | ||
| Clearance warning ECU assembly (w/o Side Monitor System) | ||
| Combination meter assembly | ||
| Detection operation is normal but sonar displays do not appear on multi-display | CAN communication system (for LHD) | |
| CAN communication system (for RHD) | ||
| Parking assist ECU (w/ Side Monitor System) | ||
| Clearance warning ECU assembly (w/o Side Monitor System) | ||
| Multi-display assembly (w/ Navigation System) | ||
| Multi-display assembly (w/o Navigation System) | ||
| Detection operation is normal but clearance sonar main switch indicator does not illuminate | Back sonar or clearance sonar switch assembly circuit | |
| Parking assist ECU (w/ Side Monitor System) | ||
| Clearance warning ECU assembly (w/o Side Monitor System) |
| Symptom | Suspected Area | See page |
|---|---|---|
| Detection operation is normal but buzzer operation is intermittent | No. 1 clearance warning buzzer circuit | |
| Parking assist ECU (w/ Side Monitor System) | ||
| Clearance warning ECU assembly (w/o Side Monitor System) |
| Symptom | Suspected Area | See page |
|---|---|---|
| Clearance sonar indicator Light does not come on | CAN communication system (for LHD) | |
| CAN communication system (for RHD) | ||
| Read value using the intelligent tester (EEPROM status) | - | |
| Parking assist ECU (w/ Side Monitor System) | ||
| Clearance warning ECU assembly (w/o Side Monitor System) | ||
| Combination meter assembly |