PARK ASSIST / MONITORING: INTUITIVE PARKING ASSIST SYSTEM: SYSTEM DESCRIPTION (2008 Sequoia)

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 on the accessory meter and by sounding a buzzer.

2. FUNCTION OF COMPONENTS

Component	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.
Accessory meter	Displays the location of the obstacle and the approximate distance between the vehicle and the obstacle. Turns the intuitive parking assist system on and off. Emits an intermittent sound to inform the driver that the ECU has detected an obstacle within prescribed ranges.
Clearance sonar main switch	Built into drive monitor switch. Output system ON/OFF signals to clearance warning ECU.
Clearance warning ECU	Receives signals from the ultrasonic sensors and sends the display signal and buzzer signal to the accessory meter.
Combination meter	Receives speed of each wheel via the skid control ECU, and then sends the signal to the clearance warning ECU.
Park/Neutral position switch	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 determines whether the intuitive parking assist system should be operated based on the clearance sonar main switch ON/OFF status, the shift lever position and the vehicle speed.

(b) When the system operates, the clearance warning ECU 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. Based on this information, the clearance warning ECU 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.

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