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Toyota Parking Assist Sensor Guide

The document describes the operation of Toyota's parking assist sensor system which uses ultrasonic sensors and a clearance warning buzzer to detect obstacles and alert the driver. It has two ultrasonic sensors that transmit and receive signals to determine distance to obstacles. The clearance warning buzzer notifies the driver if an obstacle is within 150cm, 100cm, or 50cm through intermittent or continuous sounds. The clearance warning ECU controls the sensors, determines if obstacles are present, and controls the buzzer sounds based on distance. It also checks the sensors on startup and alerts of any malfunctions.

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Maxi Sardi
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110 views2 pages

Toyota Parking Assist Sensor Guide

The document describes the operation of Toyota's parking assist sensor system which uses ultrasonic sensors and a clearance warning buzzer to detect obstacles and alert the driver. It has two ultrasonic sensors that transmit and receive signals to determine distance to obstacles. The clearance warning buzzer notifies the driver if an obstacle is within 150cm, 100cm, or 50cm through intermittent or continuous sounds. The clearance warning ECU controls the sensors, determines if obstacles are present, and controls the buzzer sounds based on distance. It also checks the sensors on startup and alerts of any malfunctions.

Uploaded by

Maxi Sardi
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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BODY ELECTRICAL — TOYOTA PARKING ASSIST-SENSOR SYSTEM BE-61

JCONSTRUCTION AND OPERATION


1. Ultrasonic Sensor
Two ultrasonic sensors are provided on the back of the vehicle. Each ultrasonic sensor consists of a sensor
portion that transmits and receives ultrasonic waves and a circuit section that amplifies them. The ultrasonic
sensor outputs the ultrasonic transmission and reception signals to the clearance warning ECU.

Circuit Section

Urethane Filled Section


00JBE08Y

" Detection Range A

BE

Approx. 80 cm
(31.5 in.)

Approx. 30 cm
(11.8 in.)
Approx. 150 cm (59.1 in.) Approx. 20 cm (7.9 in.)

00MBE32Y

2. Clearance Warning Buzzer


D The clearance warning buzzer is controlled by the clearance warning ECU.
D As the table below indicates, the clearance warning buzzer and the indicator light operate in the same cycle
in accordance with the distance to the obstacle, in order to inform the driver of the distance between the
vehicle and the obstacle.
Clearance Warning Buzzer
Obstacle Distance [cm (in.)]
(in )]
ON Time (ms) OFF Time (ms)
Approx. 150 (59.1) ~ 100 (39.4) 150 150
Approx. 100 (39.4) ~ 50 (16.7) 75 75
Approx. 50 (16.7) or less Continuous 0

NM
00M4E
BE-62 BODY ELECTRICAL — TOYOTA PARKING ASSIST-SENSOR SYSTEM

3. Clearance Warning ECU

General

The clearance warning ECU provides the following functions:


D Switching the transmission and reception of ultrasonic signals.
D Processing received signals.
D Determining the presence absence of obstacles.
D Controlling the actuation of the clearance warning buzzer and indicator light.
D Detecting whether there is an open circuit in the ultrasonic sensors.
In addition, it contains a buzzer sound adjusting knob through which the sound volume of the clearance
warning buzzer can be adjusted as desired. The sound volume is set at the maximum level as the default.

Buzzer Sound
Adjusting Knob

00MBE31Y

Initial Check (Self-diagnosis)

D After the TOYOTA parking assist-sensor system has started its activation, it sounds the buzzer for 1.0
second, while checking for malfunction in the ultrasonic sensors.
D If the system cannot activate its detection function due to a malfunction in an ultrasonic sensor, it alerts
the driver of the malfunction by sounding the clearance warning buzzer until the malfunction of the
ultrasonic sensor is eliminated.

1.5 sec
(1 Cycle)
0.25 sec
0.75 sec
Normal Recovery
ON
Clearance
Warning Buzzer OFF

D008BE20

NM
00M4E

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