TOYOTA PARKING ASSIST-SENSOR SYSTEM(for 4 Sensor Type) OPERATION CHECK

  1. MALFUNCTION BUZZER

    1. Ultrasonic sensor open circuit

      1. If an open circuit is detected between the ultrasonic sensors and the clearance warning ECU, or if a sensor malfunction is detected, the clearance warning buzzer sounds to indicate a malfunction as shown in the illustration.

        E236274E04
        Tip:

        When a malfunction is detected, the buzzer shown in the illustration continues to sound.

  2. MALFUNCTION DISPLAY (TELLTALE LIGHT ASSEMBLY)

    1. Open circuit indication

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

        E270653E01
        Tip:

        • The example shows an open circuit in the ultrasonic sensor (rear corner sensor RH).

        • The rear right detection area blinks and the other indicator areas and the vehicle mark are not illuminated (5 cycles).

        • The rear right detection area blinks and the vehicle mark is not illuminated (after 5 cycles).

    2. Frozen indication

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

        E270654E01
        Tip:

        • The example shows that the ultrasonic sensor (rear corner sensor RH) is covered with foreign matter.

        • The rear right detection area illuminates and the other indicator areas and the vehicle mark are not illuminated (5 cycles).

        • All indicator areas illuminate and the vehicle mark is not illuminated (after 5 cycles).

  3. DETECTION RANGE MEASUREMENT

    1. Detection range measurement

      Note:

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

      1. Turn the ignition switch to ON.

      2. Move the shift lever to R to check the ultrasonic sensors.

    2. Turn the clearance sonar main switch on.

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

      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).

      Tip:

      Have an assistant move the pole.

      1. Rear center sensor detection range

        E340665C01

        *a

        Approximately 50 mm (1.97 in.)

        *b

        Approximately 1000 mm (39.4 in.)

        *c

        Approximately 1500 mm (59.1 in.)

        *d

        Wall

        *e

        Approximately 1540 mm (60.6 in.)

        *g

        Approximately 400 mm (15.8 in.)

      2. Rear corner sensor detection range

        E340666C01

        *a

        Approximately 615 mm (24.2 in.)

        *b

        Approximately 550 mm (21.7 in.)

        *c

        Approximately 100 mm (3.94 in.)

        *d

        Approximately 335 mm (13.2 in.)

    4. When the ultrasonic sensors (rear corner sensor) have detected an obstacle, check the displays and check that the buzzer sounds.

      Table 1. Operation Condition

      Ignition Switch

      Clearance Sonar Main Switch

      Shift Lever Position

      ON

      On

      R
      E270548E01
      Table 2. Rear Corner Detection Range

      Detection Range

      During Judgment

      Obstacle

      *1

      Close-range detection

      Within 300 +/- 30 mm (11.8 +/- 1.18 in.)

      Buzzer: Sounds continuously

      60 mm (2.36 in.) diameter pole

      *2

      Medium-range detection

      300 +/- 30 to 400 +/- 40 mm (11.8 +/- 1.18 to 15.7 +/- 1.57 in.)

      Buzzer: Sounds intermittently (On: 0.075 seconds / Off: 0.075 seconds)

      60 mm (2.36 in.) diameter pole

      *3

      Long-range detection

      400 +/- 40 to 500 +/- 50 mm (15.7 +/- 1.57 to 19.7 +/- 1.97 in.)

      Buzzer: Sounds intermittently (On: 0.15 seconds / Off: 0.15 seconds)

      60 mm (2.36 in.) diameter pole
      Tip:

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

    5. When the ultrasonic sensors (rear center sensor) have detected an obstacle, check the displays and check that the buzzer sounds.

      Table 3. Operation Condition

      Ignition Switch

      Clearance Sonar Main Switch

      Shift Lever Position

      ON

      On

      R
      E270549E01
      Table 4. Rear Corner Detection Range

      Detection Range

      During Judgment

      Obstacle

      *1

      Close-range detection

      Within 300 +/- 30 mm (11.8 +/- 1.18 in.)

      Buzzer: Sounds continuously

      60 mm (2.36 in.) diameter pole

      *2

      Medium-range detection

      300 +/- 30 to 400 +/- 40 mm (11.8 +/- 1.18 to 15.7 +/- 1.57 in.)

      Buzzer: Sounds intermittently (On: 0.075 seconds / Off: 0.075 seconds)

      60 mm (2.36 in.) diameter pole

      *3

      Long-range detection

      400 +/- 40 to 500 +/- 50 mm (15.7 +/- 1.57 to 19.7 +/- 1.97 in.)

      Buzzer: Sounds intermittently (On: 0.15 seconds / Off: 0.15 seconds)

      60 mm (2.36 in.) diameter pole

      *4

      4. Longest-range detection

      600 +/- 60 to 1500 +/- 150 mm (23.6 +/- 2.36 to 59.1 +/- 5.91 in.) (To the wall)

      Buzzer: Sounds intermittently (On: 0.15 seconds / Off: 0.65 seconds)

      Wall
      Tip:

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

    6. Check the indicator and buzzer, when the rear center sensors and rear corner sensors have detectedan obstacle.

      Table 5. Operation Condition

      Ignition Switch

      Clearance Sonar Main Switch

      Shift Lever Position

      ON

      On

      R
      Table 6. Buzzer

      Detection Range

      Indicator Displayed

      1. Close-range detection

      Sounds continuously

      2. Medium-range detection

      Sounds intermittently

      (On: 0.075 seconds./Off: 0.075 seconds.)

      3. Long-range detection

      Sounds intermittently

      (On: 0.15 seconds./Off: 0.15 seconds.)

      4. Maximum Long-range detection

      Sounds intermittently

      (On: 0.15 seconds./Off: 0.65 seconds.)
      Table 7. Clearance Warning Indicator

      Detection Range

      Indicator Displayed

      1. Close-range detection

      Corner indicator(s) are illuminated and/or back indicator is illuminated

      2. Medium-range detection

      Corner indicator(s) are blinking and/or back indicator is blinking

      3. Long-range detection

      Corner indicator(s) are blinking and/or back indicator is blinking

      4. Maximum Long-range detection

      Back indicator is blinking
      E198682C01

      *A

      Telltale Light Assembly

      -

      -

      *1

      Corner Indicator

      *2

      Rear Center Indicator
      Tip:

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