Toyota Tundra Service Manual: System Description

SYSTEM DESCRIPTION

1. GENERAL

(a) When the vehicle is driven at 10 km/h (6.2 mph) or less, the ultrasonic sensors detect any obstacles at the corners and rear of the vehicle. The system then informs the driver of the distance between the sensors and the obstacles as well as their positions by indicating them and by sounding a buzzer on the combination meter assembly.

2. FUNCTION OF COMPONENTS

Components

Function

Ultrasonic sensor

The ultrasonic sensor sends and receives ultrasonic waves. Based on the received wave, the sensor calculates the approximate distance value between the vehicle and the obstacle, and sends the distance value as a signal to the clearance warning ECU assembly.

Combination meter assembly

  • Displays the location of the obstacle and the approximate distance between the vehicle and the obstacle.
  • Emits an intermittent sound to inform the driver that the clearance warning ECU assembly has detected an obstacle within prescribed ranges.
  • Receives speed of each wheel via the skid control ECU (brake actuator assembly), and then sends the signal to the clearance warning ECU assembly.

Back sonar or clearance sonar switch

Output system ON/OFF signals to clearance warning ECU assembly.

Clearance warning ECU assembly

Receives signals from the ultrasonic sensors and sends the display signal and buzzer signal to the combination meter assembly.

Park/neutral position switch assembly

Sends a signal that activates the intuitive parking assist system when the shift lever is moved to R.

3. OPERATION EXPLANATION

(a) The clearance warning ECU assembly determines whether the intuitive parking assist system should be operated based on the back sonar or clearance sonar switch ON/OFF status, the shift position and the vehicle speed.

(b) When the system operates, the clearance warning ECU assembly transmits ultrasonic waves from the ultrasonic sensors. If these waves encounter an obstacle within one or more of the sensors' ranges, the waves are reflected back to the sensors, which transmit them as a signal to the clearance warning ECU assembly. Based on this information, the clearance warning ECU assembly sends signals to the indicator and the clearance warning buzzer. The approximate distance between the vehicle and the obstacle is then indicated, and the buzzer sounds.

HINT:

Refer to "OPERATION CHECK" for the detailed operation (See page ).

    Rear Clearance Sonar Sensor RH Circuit

    System Diagram

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