CLEARANCE SONAR SYSTEM > OPERATION CHECK

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1. Turn the engine switch on (IG).
   

2. When the clearance sonar system is turned ON, check that the following occurs: 1) after 0.1 milliseconds, the buzzer sounds for approximately 0.8 seconds, and 2) the system starts the obstacle detection operation.
   

   HINT:

   1. If a sensor has an open circuit or a sensor's detection operation malfunctions because it is wet or frozen, a malfunction display is shown in the multi-information display and multi-display, and the buzzer sounds.
      
   2. When the sensor condition returns to normal, the system ends normal clearance sonar mode and returns to steering sensing mode.
      
   3. If the clearance sonar main switch is ON and the engine switch is turned on (IG), the buzzer does not sound.
      

1. Ultrasonic sensor open circuit
   
   

   
   
   

   1. If there is an open circuit between the ultrasonic sensor and the clearance warning ECU or a sensor is malfunctioning, the malfunction is displayed as shown in the illustration.
      

      
      
      
      

      HINT:

      1. The example shows an open circuit in the No. 3 ultrasonic sensor (front left sensor).
         
      2. If a sensor has an open circuit, refer to "open circuit is displayed during self-check function" on the Problem Symptoms Table to inspect it.
         





2. Ultrasonic sensor frozen
   
   

   
   
   

   1. If a sensor is covered with foreign matter, such as mud or snow, the affected sensor is displayed as shown in the illustration.
      

      
      
      
      

      HINT:

      1. The example shows that the No. 3 ultrasonic sensor (front left sensor) is covered with foreign matter.
         
      2. If "CLEAN SONAR" is displayed, cleaning the foreign matter from the sensor will return the sensor to normal.
         





3. Steering angle information failure display
   
   

   
   
   

   1. A malfunction condition is displayed as shown in the illustration if one of the following occurs: 1) the steering sensor is determined to be malfunctioning; 2) the VGRS system*1 is malfunctioning; 3) there is an open circuit between the steering sensor and clearance warning ECU; or 4) as a result of low battery voltage, CAN communication information is blocked.
      

      
      
      
      

      HINT:

      1. *1: Variable gear ratio steering system (3UZ-FE only)
         
      2. The steering sensor and VGRS system communicate with the clearance warning ECU via the CAN.
         
      3. When a steering angle information failure occurs, the system enters normal clearance sonar mode.
         





4. Steering angle mid-point learning operation display
   
   

   
   
   

   1. If the malfunction can be repaired by disconnecting and reconnecting the cable from the negative (-) battery terminal, or performing the steering angle mid-point learning operation again, it is displayed as shown in the illustration.
      

      
      
      
      

      HINT:

      1. When the steering angle mid-point learning operation is complete, the steering sensing function returns to normal.
         
      2. During the steering angle mid-point learning operation, the system enters normal clearance sonar mode.
         

1. Ultrasonic sensor open circuit
   
   

   1. If there is an open circuit between the ultrasonic sensor and the clearance warning ECU or a sensor is malfunctioning, the malfunction is displayed as shown in the illustration.
      

      HINT:

      1. This example shows an open circuit in the No. 1 ultrasonic sensor (rear right sensor).
         
      2. If a sensor has an open circuit, refer to "open circuit is displayed during self-check function" on the Problem Symptoms Table to inspect it.
         





2. Ultrasonic sensor frozen
   
   

   1. If a sensor is covered with foreign matter, such as mud or snow, the affected sensor is displayed as shown in the illustration.
      

      HINT:

      1. The example shows that the No. 3 ultrasonic sensor (front left sensor) is covered with foreign matter.
         
      2. If "CLEAN SONAR" is displayed, cleaning the foreign matter from the sensor will return the sensor to normal.
         





3. Steering angle information failure display
   
   

   1. A malfunction condition is displayed as shown in the illustration if one of the following occurs: 1) the steering sensor is determined to be malfunctioning; 2) the VGRS system*1 is malfunctioning; 3) there is an open circuit between the steering sensor and clearance warning ECU; or 4) as a result of low battery voltage, CAN communication information is blocked.
      

      HINT:

      1. *1: Variable gear ratio steering system (3UZ - FE only)
         
      2. The steering sensor and VGRS system communicate with the clearance warning ECU via the CAN.
         
      3. When a steering angle information failure occurs, the system enters normal clearance sonar mode.
         
      4. The detection range display labeled *2 appears in normal clearance sonar mode.
         





4. Steering angle mid-point learning operation display
   
   

   1. If the malfunction can be repaired by disconnecting and reconnecting the cable from the negative (-) battery terminal, or performing the steering angle mid-point learning operation again, it is displayed as shown in the illustration.
      

      HINT:

      1. When the steering angle mid-point learning operation is complete, the steering sensing function returns to normal.
         
      2. During the steering angle mid-point learning operation, the system enters normal clearance sonar mode.
         
      3. The detection range display labeled *1 appears in normal clearance sonar mode.
         

1. Detection range measurement
   

   NOTICE:

   Make sure the vehicle does not move by applying the parking brake firmly.

   
   

   1. Turn the engine switch on (IG).
      

   2. Move the shift lever to any position except P or R to check the No. 3 ultrasonic sensors.
      

      HINT:

      The front right center and front left center sensors (No. 3 ultrasonic sensors) do not operate when the shift lever is on R.

   3. Move the shift lever to any position except R to check the No. 1 and No. 2 ultrasonic sensors.
      

      HINT:

      1. The No. 1 and No. 2 ultrasonic sensors do not operate when the shift lever is in a position other than R.
         
      2. The front right center and front left center sensors (No. 3 ultrasonic sensors) do not operate when the shift lever is on R.
         

2. Turn the clearance sonar main switch ON.
   





3. Move a φ 60 mm (2.36 in.) pole near each sensor to measure its detection range.
   

   
   
   
   

   NOTICE:

   1. These detection ranges are applicable when positioning the φ 60 mm (2.36 in.) pole parallel or perpendicular to the ground. The ranges vary depending on the measuring method and type of obstacle (such as walls).
      
   2. The No. 1 ultrasonic sensor side view detection range's hatched area (labeled *1) represents the cross section of the top view detection range's A lines. The hatched area (*1) does not represent the entire side view detection range.
      





4. When the No. 3 ultrasonic sensors have detected an obstacle, check the displays and buzzer sounds.
   
   

   Operation condition: 

   Engine Switch	Clearance Sonar Main Switch	Shift Lever Position	Vehicle Speed
   on (IG)	ON	In any position except P, R	10 km/h (6 mph) or less

   
   
   
   
   

   Standard:

   
   

   Multi-information display (shift lever position not on P) 

   Detection Range	During Collision Judgment	During Avoidance Judgment	During Low Priority Avoidance Judgment
   *1 Close-range detection Within approx. 250 +- 50 mm (9.84 +- 1.97 in.)	Buzzer: Sounds continuously Number of bars displayed: 1 (Blinking) No steering guide mark	-	-
   *2 Medium-range detection From approx. 250 +- 50 to 375 +- 50mm (9.84 +- 1.97 to 14.76 +- 1.97 in.)	Buzzer: Sounds intermittently (ON: 75 msec. / OFF: 75 msec.) Number of bars displayed: 2 (illuminated) No steering guide mark	Buzzer: Sounds intermittently (ON: 75 msec. / OFF: 75 msec.) Number of bars displayed: 2 (illuminated) Steering guide mark illuminates	Buzzer: Does not sound Number of bars displayed: 2 (illuminated) No steering guide mark
   *3 Long-range detection From approx. 375 +- 50 to 500 +- 50 mm (14.76 +- 1.97 to 19.69 +- 1.97 in.)	Buzzer: Sounds intermittently (ON: 150 msec. / OFF: 150 msec.) Number of bars displayed: 3 (illuminated) No steering guide mark	Buzzer: Sounds intermittently (ON: 150 msec. / OFF: 150 msec.) Number of bars displayed: 3 (illuminated) Steering guide mark illuminates	Buzzer: Does not sound Number of bars displayed: 3 (illuminated) No steering guide mark
   *4 Maximum long-range detection From approx. 500 +- 50 to 1,000 +- 100 mm ( 19.69 +- 1.97 to 39.37 +- 3.94 in.)	Buzzer: Sounds intermittently (ON: 150 msec. / OFF: 650 msec.) Number of bars displayed: 4 (illuminated) No steering guide mark	Buzzer: Sounds intermittently (ON: 150 msec. / OFF: 650 msec.) Number of bars displayed: 4 (illuminated) Steering guide mark illuminates	Buzzer: Does not sound Number of bars displayed: 4 (illuminated) No steering guide mark

   
   

   Multi-display (shift lever position not on P) 

   Detection Range	During Collision Judgment	During Avoidance Judgment	During Low Priority Avoidance Judgment
   *1 Close-range detection Within approx. 250 +- 50 mm (9.84 +- 1.97 in.)	Buzzer: Sounds continuously Number of bars displayed: 1 (red illumination) No steering guide mark	-	-
   *2 Medium-range detection From approx. 250 +- 50 to 375 +- 50 mm (9.84 +- 1.97 to 14.76 +- 1.97 in.)	Buzzer: Sounds intermittently (ON: 75 msec. / OFF: 75 msec.) Number of bars displayed: 2 (yellow illumination) No steering guide mark	Buzzer: Sounds intermittently (ON: 75 msec. / OFF: 75 msec.) Number of bars displayed: 2 (yellow illumination) Steering guide mark illuminates	Buzzer: Does not sound Number of bars displayed: 2 (yellow illumination) No steering guide mark
   *3 Long-range detection From approx. 375 +- 50 to 500 +- 50 mm (14.76 +- 1.97 to 19.69 +- 1.97 in.)	Buzzer: Sounds intermittently (ON: 150 msec. / OFF: 150 msec.) Number of bars displayed: 3 (yellow illumination) No steering guide mark	Buzzer: Sounds intermittently (ON: 150 msec. / OFF: 150 msec.) Number of bars displayed: 3 (yellow illumination) Steering guide mark illuminates	Buzzer: Does not sound Number of bars displayed: 3 (green illumination) No steering guide mark
   *4 Maximum long-range detection From approx. 500 +- 50 to 1,000 +- 100 mm (19.69 +- 1.97 to 39.37 +- 3.94 in.)	Buzzer: Sounds intermittently (ON: 150 msec. / OFF: 650 msec.) Number of bars displayed: 4 (yellow illumination) No steering guide mark	Buzzer: Sounds intermittently (ON: 150 msec. / OFF: 650 msec.) Number of bars displayed: 4 (yellow illumination) Steering guide mark illuminates	Buzzer: Does not sound Number of bars displayed: 4 (green illumination) No steering guide mark

   
   

   w/ Rear view monitor (shift lever position R) 

   Detection Range	During Collision Judgment	During Avoidance Judgment	During Low Priority Avoidance Judgment
   *1 Close-range detection Within approx. 250 +- 50 mm (9.84 +- 1.97 in.)	Buzzer: Sounds continuously *5: Illumination (red)	-	-
   *2 Medium-range detection From approx. 250 +- 50 to 375 +- 50 mm (9.84 +- 1.97 to 14.76 +- 1.97 in.)	Buzzer: Sounds intermittently (ON: 75 msec. / OFF: 75 msec.) *5: Blinking (yellow)	Buzzer: Sounds intermittently (ON: 75 msec. / OFF: 75 msec.) *5: Blinking (yellow)	Buzzer: Does not sound *5: Illumination (green)
   *3 Long-range detection From approx. 375 +- 50 to 500 +- 50 mm (14.76 +- 1.97 to 19.69 +- 1.97 in.)	Buzzer: Sounds intermittently (ON: 150 msec. / OFF: 150 msec.) *5: Blinking (yellow)	Buzzer: Sounds intermittently (ON: 150 msec. / OFF: 150 msec.) *5: Blinking (yellow)	Buzzer: Does not sound *5: Illumination (green)
   *4 Maximum long-range detection From approx. 500 +- 50 to 1,000 +- 100 mm (19.69 +- 1.97 to 39.37 +- 3.94 in.)	Buzzer: Sounds intermittently (ON: 150 msec. / OFF: 650 msec.) *5: Blinking (yellow)	Buzzer: Sounds intermittently (ON: 150 msec. / OFF: 650 msec.) *5: Blinking (yellow)	Buzzer: Does not sound *5: Illumination (green)

   HINT:

   1. Ultrasonic waves are used to measure the detection range. However, the detection range may vary depending on the ambient temperature.
      
   2. "During collision judgment" refers to situations where the obstacle cannot be avoided using the steering wheel.
      
   3. "During avoidance judgment" refers to situations where the obstacle can be avoided using the steering wheel.
      
   4. "During low priority avoidance judgment" refers to situations where, with the current steering wheel position, the vehicle will not come within 250 mm (9.84 in.) of the obstacle.
      
   5. *5 in the illustration refers to the color and status of the steering guide mark on the displays.
      
   6. When the shift lever is on R, the front left center and front right center sensors do not operate.
      





5. When the No. 2 ultrasonic sensors have detected an obstacle, check the display and buzzer sounds.
   
   

   Operation condition: 

   Engine Switch	Clearance Sonar Main Switch	Shift Lever Position	Vehicle Speed
   on (IG)	ON	R	-

   
   
   
   
   

   Standard:

   
   

   Multi-information display (shift lever position R) 

   Detection Range	During Detection
   *1 Close-range detection Within approx. 350 +- 50 mm (13.78 +- 1.97 in.)	Buzzer: Sounds continuously Number of bars displayed: 1 (blinking)
   *2 Medium-range detection From approx. 350 +- 50 to 450 +- 50 mm (13.78 +- 1.97 to 17.72 +- 1.97 in.)	Buzzer: Sounds intermittently (ON: 75 msec. / OFF: 75 msec.) Number of bars displayed: 2 (illuminated)
   *3 Long-range detection From approx. 450 +- 50 to 600 +- 60 mm (17.72 +- 1.97 to 23.62 +- 2.36 in.)	Buzzer: Sounds intermittently (ON: 150 msec. / OFF: 150 msec.) Number of bars displayed: 3 (illuminated)
   *4 Maximum long-range detection From approx. 600 +- 60 to 1,500 +-150 mm (23.62 +- 2.36 to 59.06 +- 5.91 in.)	Buzzer: Sounds intermittently (ON: 150 msec. / OFF: 650 msec.) Number of bars displayed: 4 (illuminated)

   
   

   Multi-display (shift lever position not on P) 

   Detection Range	During Collision Judgment
   *1 Close-range detection Within approx. 350 +- 50 mm (13.78 +- 1.97 in.)	Buzzer: Sounds continuously Number of bars displayed: 1 (red illumination)
   *2 Medium-range detection From approx. 350 +- 50 to 450 +- 50 mm (13.78 +- 1.97 to 17.72 +- 1.97 in.)	Buzzer: Sounds intermittently (ON: 75 msec. / OFF: 75 msec.) Number of bars displayed: 2 (yellow illumination)
   *3 Long-range detection From approx. 450 +- 50 to 600 +- 60 mm (17.72 +- 1.97 to 23.62 +- 2.36 in.)	Buzzer: Sounds intermittently (ON: 150 msec. / OFF: 150 msec.) Number of bars displayed: 3 (yellow illumination)
   *4 Maximum long-range detection From approx. 600 +- 60 to 1,500 +-150 mm (23.62 +- 2.36 to 59.06 +- 5.91 in.)	Buzzer: Sounds intermittently (ON: 150 msec. / OFF: 650 msec.) Number of bars displayed: 4 (yellow illumination)

   
   

   w/ Rear view monitor (shift lever position R) 

   Detection Range	During Collision Judgment
   *1 Close-range detection Within approx. 350 +- 5 mm (13.78 +- 1.97 in.)	Buzzer: Sounds continuously *5: Illumination (red)
   *2 Medium-range detection From approx. 350 +- 50 to 450 +- 50 mm (13.78 +- 17.72 to 14.76 +- 1.97 in.)	Buzzer: Sounds intermittently (ON: 75 msec. / OFF: 75 msec.) *5: Blinking (yellow)
   *3 Long-range detection From approx. 450 +- 50 to 600 +- 50 mm (17.72 +- to 23.62 +- 1.97 in.)	Buzzer: Sounds intermittently (ON: 150 msec. / OFF: 150 msec.) *5: Blinking (yellow)
   *4 Maximum long-range detection From approx. 600 +- 50 to 1,500 mm (23.62 +- 2.36 to 59.06in.)	Buzzer: Sounds intermittently (ON: 150 msec. / OFF: 650 msec.) *5: Blinking (yellow)

   HINT:

   Ultrasonic waves are used to measure the detection range. However, the detection range may vary depending on the ambient temperature.





6. When the No. 1 ultrasonic sensors have detected an obstacle, check the display and buzzer sounds.
   
   

   Operation condition: 

   Engine Switch	Clearance Sonar Main Switch	Shift Lever Position	Vehicle Speed
   on (IG)	ON	R	10 km/h (6 mph) or less

   
   
   
   
   

   Standard:

   
   

   Multi-information display (shift lever position R) 

   Detection Range	During Detection
   *1 Close-range detection Within approx. 250 +- 50 mm (9.84 +- 1.97 in.)	Buzzer: Sounds continuously Number of bars displayed: 1 (blinking)
   *2 Medium-range detection From approx. 250 +- 50 to 375 +- 50 mm (9.84 +- 1.97 to 14.76 +- 1.97 in.)	Buzzer: Sounds intermittently (ON: 75 msec. / OFF: 75 msec.) Number of bars displayed: 2 (illuminated)
   *3 Long-range detection From approx. 375 +- 50 to 500 +- 50 mm (14.76 +- 1.97 to 19.69 +- 2.36 in.)	Buzzer: Sounds intermittently (ON: 150 msec. / OFF: 150 msec.) Number of bars displayed: 3 (illuminated)

   
   

   Multi-display (shift lever position not on P) 

   Detection Range	During Collision Judgment
   *1 Close-range detection Within approx. 250 +- 50 mm (9.84 +- 1.97 in.)	Buzzer: Sounds continuously Number of bars displayed: 1 (red illumination)
   *2 Medium-range detection From approx. 250 +- 50 to 375 +- 50 mm (9.84 +- 1.97 to 14.76 +- 1.97 in.)	Buzzer: Sounds intermittently (ON: 75 msec. / OFF: 75 msec.) Number of bars displayed: 2 (yellow illumination)
   *3 Long-range detection From approx. 375 +- 50 to 500 +- 50 mm (14.76 +- 1.97 to 19.69 +- 2.36 in.)	Buzzer: Sounds intermittently (ON: 150 msec. / OFF: 150 msec.) Number of bars displayed: 3 (yellow illumination)

   
   

   w/ Rear view monitor (shift lever position R) 

   Detection Range	During Collision Judgment
   *1 Close-range detection Within approx. 250 +- 50 mm (9.84 +- 1.97 in.)	Buzzer: Sounds continuously *4 : Illumination (red)
   *2 Medium-range detection From approx. 250 +- 50 to 375 +- 50 mm (9.84 +- 1.97 to 14.76 +- 1.97 in.)	Buzzer: Sounds intermittently (ON: 75 msec. / OFF: 75 msec.) *4: Blinking (yellow)
   *3 Long-range detection From approx. 375 +- 50 to 500 +- 50 mm (14.76 +- 1.97 to 19.69 +- 2.36 in.)	Buzzer: Sounds intermittently (ON: 150 msec. / OFF: 150 msec.) *4: Blinking (yellow)

   HINT:

   Ultrasonic waves are used to measure the detection range. However, the detection range may vary depending on the ambient temperature.





7. While changing the steering angle, check that the wheel angle is displayed on the multi-display.
   

   Standard:

   Result is as shown in the illustration.