TOYOTA PARKING ASSIST-SENSOR SYSTEM (w/o Multi-display) 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 (Initial check function also does not operate) | Proceed to "Clearance Warning ECU Power Source Circuit" | |
| Replace clearance warning ECU (for LHD) | ||
| Replace clearance warning ECU (for RHD) | ||
| Clearance warning indicator indicates rear clearance sonar sensor is frozen | Clean the sensor surface | |
| Proceed to "Rear Clearance Sonar Sensor LH Circuit" | ||
| Proceed to "Rear Clearance Sonar Sensor RH Circuit" | ||
| Replace clearance warning ECU (for LHD) | ||
| Replace clearance warning ECU (for RHD) | ||
| Clearance warning indicator indicates back sonar sensor is frozen | Clean the sensor surface | |
| Proceed to "Back Sonar Sensor LH Circuit" | ||
| Proceed to "Back Sonar Sensor RH Circuit" | ||
| Replace clearance warning ECU (for LHD) | ||
| Replace clearance warning ECU (for RHD) | ||
| Clearance warning indicator indicates open in rear clearance sonar sensor circuit | Initial check function | |
| Proceed to "Rear Clearance Sonar Sensor LH Circuit" | ||
| Proceed to "Back Sonar Sensor LH Circuit" | ||
| Proceed to "Back Sonar Sensor RH Circuit" | ||
| Proceed to "Rear Clearance Sonar Sensor RH Circuit" | ||
| Replace clearance warning ECU (for LHD) | ||
| Replace clearance warning ECU (for RHD) | ||
| Clearance sonar sensors operate when shift lever is not in R, or do not operate even when shift lever is in R | Proceed to "Park/Neutral Position Switch Circuit"*1 | |
| Proceed to "Back-up Light Switch Circuit"*2 | ||
| Replace clearance warning ECU (for LHD) | ||
| Replace clearance warning ECU (for RHD) | ||
| Indicator does not dim at night, or illuminates dimly during daytime | Proceed to "Taillight Relay Circuit" | |
| Proceed to "Clearance Sonar Main Switch Circuit" | ||
| Replace clearance warning ECU (for LHD) | ||
| Replace clearance warning ECU (for RHD) | ||
| Detection operation is normal but clearance warning indicator does not illuminate | Inspect back sonar or clearance sonar switch assembly | |
| Proceed to "Indicator Circuit" | ||
| Replace clearance warning indicator assembly | ||
| Replace clearance warning ECU (for LHD) | ||
| Replace clearance warning ECU (for RHD) | ||
| System operates even when vehicle speed is 10 km/h (6.2 mph) or more | Proceed to "Speed Signal Circuit" | |
| Replace clearance warning ECU (for LHD) | ||
| Replace clearance warning ECU (for RHD) | ||
| System operates, clearance warning buzzer does not sound | Proceed to "Clearance Warning Buzzer Circuit" | |
| Replace No. 1 clearance warning buzzer | ||
| Replace clearance warning ECU (for LHD) | ||
| Replace clearance warning ECU (for RHD) | ||
| Clearance warning buzzer volume is low | Replace No. 1 clearance warning buzzer | |
| Replace clearance warning ECU (for LHD) | ||
| Replace clearance warning ECU (for RHD) |
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*1: for Automatic Transmission
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*2: for Manual Transmission