TOYOTA PARKING ASSIST-SENSOR SYSTEM OPERATION CHECK


  1. MALFUNCTION BUZZER


    1. Turn the ignition switch to ON.

    2. Turn the back sonar or clearance sonar switch assembly on.

    3. Start the sensor check.

      Tech Tips

      The sensor check is carried out regardless of vehicle speed and shift position for 5 seconds.

    4. If any of the following conditions occur, the No. 1 clearance warning buzzer will sound.


      • A No. 1 ultrasonic sensor is covered with foreign matter, such as mud or snow.

      • A No. 1 ultrasonic sensor is frozen.

      • A No. 1 ultrasonic sensor is malfunctioning.

      • There is an open circuit between a No. 1 ultrasonic sensor and the clearance warning ECU assembly.

      Tech Tips

      When a malfunction is detected, the No. 1 clearance warning buzzer continues to sound as shown in the illustration.

      B003PAFE08

  2. DETECTION RANGE MEASUREMENT

    Note

    The following measurement and inspection will be performed with the shift lever in a position other than N. Be sure to apply the parking brake and depress the brake pedal firmly to prevent the vehicle from moving.


    1. Turn the ignition switch to ON.

    2. Turn the back sonar or clearance sonar switch assembly on.

    3. Detection range measurement:


      1. Move the shift lever according to the table below.

        Measurement Area Shift Lever Position
        Rear Center R

      2. Move a 60 mm (2.36 in.) diameter pole near each sensor to measure its detection range. When measuring the longest-range detection of the rear center sonar, use a wall or equivalent.

        Note

        These detection ranges are applicable when positioning the 60 mm (2.36 in.) diameter pole parallel or perpendicular to the ground. The detection range varies depending on the measuring method and type of obstacle (such as walls).

        Tech Tips

        Have an assistant move the pole.

        Figure 1. Rear Center Sonars Detection Range

        B003M24C01
        *a Wall *b Approximately 1720 mm (67.7 in.)
        *c Approximately 1000 mm (39.4 in.) *d Approximately 1500 mm (59.1 in.)
        *e Approximately 550 mm (21.6 in.) *f Approximately 200 mm (7.9 in.)

    4. Rear center sonar buzzer operation check


      1. When the No. 1 ultrasonic sensors (rear center) have detected an obstacle, check that the No. 1 clearance warning buzzer sounds.

        Operation Condition
        Engine Switch Back sonar or clearance sonar switch Assembly Shift Lever Position
        ON On R
        B003OFGE01

        Tech Tips

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