TOYOTA PARKING ASSIST-SENSOR SYSTEM(except Hatchback)

FUNCTION OF MAIN COMPONENTS

Component		Function
No. 1/No. 2/No. 4 Ultrasonic Sensor (10)		Detects the distance between the vehicle and an obstacle.
No. 1 Clearance Warning Buzzer (Front)		Sounds to inform the driver according to the distance to the obstacle.
No. 2 Clearance Warning Buzzer (Rear)
Combination Meter Assembly	Multi-information Display	Displays the location of the obstacle and the approximate distance between the vehicle and the obstacle. Displays an indication of a malfunction or freezing of an ultrasonic sensor to inform the driver.
Combination Meter Assembly	Master Warning Light	Illuminates in accordance with the indication on the multi-information display.
Back Sonar or Clearance Sonar Switch Assembly		Operating this switch allows the operation of the TOYOTA parking assist-sensor system to be enabled or disabled.
Clearance Warning ECU Assembly		Judges the approximate distance between the vehicle and an obstacle based on signals from the ultrasonic sensors. Output signals are sent to the multi-information display. Sounds the No. 1 or No. 2 clearance warning buzzer.
Air Conditioning Amplifier Assembly		Sends outside temperature information to the clearance warning ECU assembly to adjust the distance rate from the ultrasonic sensors.
Transmission Floor Shift Assembly - Shift Lever Position Sensor		Sends the shift state signals to the power management control ECU.
Power Management Control ECU		Transmits the shift state signals to the clearance warning ECU assembly. Transmits data between CAN V bus and CAN sub bus 11.
Brake Booster with Master Cylinder Assembly - Skid Control ECU		Sends the wheel speed signal to the clearance warning ECU assembly.

FUNCTION

The operating condition of each sensor differs according to its installed position as shown in the table below:

Installation Position	Operating Condition
Front Corner	Power switch is on (IG). System is activated.* Shift state other than park (P) is selected. Vehicle speed is approximately 10 km/h (6 mph) or less.
Front Center
Front Side
Rear Corner	Power switch is on (IG). System is activated.* Reverse (R) is selected.
Rear Center

*: Even if the back sonar or clearance sonar switch assembly is off, the system is activated when the simple intelligent parking assist system is operating.

No. 1/No. 2 Clearance Warning Buzzer

Depending on the detection distance and the detection area, the sound pattern of the No. 1 clearance warning buzzer will vary.

Detection Area	Detection Distance (mm (in.))		Buzzer Sound Pattern
Detection Area	Detection Distance (mm (in.))		On (msec.)	Off (msec.)
Front Corner	Long	500 +/- 50 to 375 +/- 37.5 (19.7 +/- 2.0 to 14.8 +/- 1.5)	150 +/- 15	150 +/- 15
	Middle	375 +/- 37.5 to 250 +/- 25 (14.8 +/- 1.5 to 9.8 +/- 1.0)	75 +/- 7.5	75 +/- 7.5
	Short	250 +/- 25 or less (9.8 +/- 1.0 or less)	Continuous Sound	0
Front Center	Longest	1000 +/- 100 to 550 +/- 55 (39.4 +/- 3.9 to 21.7 +/- 2.2)	150 +/- 15	650 +/- 15
	Long	550 +/- 55 to 425 +/- 42.5 (21.7 +/- 2.2 to 16.7 +/- 1.7)	150 +/- 15	150 +/- 15
	Middle	425 +/- 42.5 to 300 +/- 30 (16.7 +/- 1.7 to 11.8 +/- 1.2)*1	75 +/- 7.5	75 +/- 7.5
	Middle	425 +/- 42.5 to 250 +/- 25 (16.7 +/- 1.7 to 9.8 +/- 1.0)*2	75 +/- 7.5	75 +/- 7.5
	Short	300 +/- 30 or less (11.8 +/- 1.2 or less)*1	Continuous Sound	0
	Short	250 +/- 25 or less (9.8 +/- 1.0 or less)*2	Continuous Sound	0
Front Side	Short	250 +/- 25 or less (9.8 +/- 1.0 or less)	Continuous Sound	0

*1: While the simple intelligent parking assist system is not operating

*2: While the simple intelligent parking assist system is operating

Depending on the detection distance and the detection area, the sound pattern of the No. 2 clearance warning buzzer will vary.

Detection Area	Detection Distance (mm (in.))		Buzzer Sound Pattern
Detection Area	Detection Distance (mm (in.))		On (msec.)	Off (msec.)
Rear Corner	Long	500 +/- 50 to 375 +/- 37.5 (19.7 +/- 2.0 to 14.8 +/- 1.5)	150 +/- 15	150 +/- 15
	Middle	375 +/- 37.5 to 250 +/- 25 (14.8 +/- 1.5 to 9.8 +/- 1.0)	75 +/- 7.5	75 +/- 7.5
	Short	250 +/- 25 or less (9.8 +/- 1.0 or less)	Continuous Sound	0
Rear Center	Longest	1500 +/- 150 to 550 +/- 55 (59.1 +/- 5.9 to 21.7 +/- 2.2)	150 +/- 1.5	650 +/- 65
	Long	550 +/- 55 to 425 +/- 42.5 (21.7 +/- 2.2 to 16.7 +/- 1.7)	150 +/- 1.5	150 +/- 1.5
	Middle	425 +/- 42.5 to 300 +/- 30 (16.7 +/- 1.7 to 11.8 +/- 1.2)*1	75 +/- 7.5	75 +/- 7.5
	Middle	425 +/- 42.5 to 250 +/- 25 (16.7 +/- 1.7 to 9.8 +/- 1.0)*2	75 +/- 7.5	75 +/- 7.5
	Short	300 +/- 30 or less (11.8 +/- 1.2 or less)*1	Continuous Sound	0
	Short	250 +/- 25 or less (9.8 +/- 1.0 or less)*2	Continuous Sound	0

*1: While the simple intelligent parking assist system is not operating

*2: While the simple intelligent parking assist system is operating

The ultrasonic sensors are divided into 2 groups: a front section group (front corners, front center and front sides) and a rear section group (rear corners and rear center). If multiple ultrasonic sensors detect obstructions at the same time, the No. 1/No. 2 clearance warning buzzer sounds as follows, in accordance with the detection distance and detection area of each group:

Buzzer Sound Pattern ON/OFF Time (msec.)
Detection Distance		Front Section
Detection Distance		Short	Middle	Long	Longest	Not detected
Rear Section	Short	Timing 1	Continuous Sound (Rear)	Continuous Sound (Rear)	Continuous Sound (Rear)	Continuous Sound (Rear)
	Middle	Continuous Sound (Front)	75/75 (*)	75/75 (Rear)	75/75 (Rear)	75/75 (Rear)
	Long	Continuous Sound (Front)	75/75 (Front)	150/150 (*)	150/150 (Rear)	150/150 (Rear)
	Longest	Continuous Sound (Front)	75/75 (Front)	150/150 (Front)	150/650 (*)	150/650 (Rear)
	Not detected	Continuous Sound (Front)	75/75 (Front)	150/150 (Front)	150/650 (Front)	None

*: The buzzer of the front or rear sensor, which is closest to the obstacle, sounds.

Figure 1. Timing 1

Multi-information Display

The location of an obstacle and the approximate distance between the vehicle and the obstacle are displayed on the multi-information display.

The number of lines shown on the display changes based on the actual distance and flashes when the distance is short.

*1	Front Corner LH/Front Side LH	*2	Front Corner RH/Front Side RH
*3	Front Center	*4	Rear Corner LH
*5	Rear Corner RH	*6	Rear Center
*7	Distance	*8	Longest
*9	Long	*10	Middle
*11	Short	*12	Flashes

A screen displaying a warning message indicating an ultrasonic sensor malfunction, ultrasonic sensor freezing, or presence of foreign matter on the ultrasonic sensor, is displayed on the multi-information display. The warning message appears in the same language that has been selected by the language selector of the multi-information display.

Detection Area

The detection areas of the ultrasonic sensor are as shown in the following illustration.

These detection areas are applicable when positioning a 60 mm (2.36 in.) diameter pole parallel or perpendicular to the ground. The ranges vary depending on the measuring method and type of obstacle.

Figure 2. Corners

*a	Approximately 500 mm (19.7 in.)	*b	Approximately 650 mm (25.6 in.)
*c	Approximately 550 mm (21.7 in.)	*d	Approximately 100 mm (3.9 in.)

Figure 3. Center

*a	Approximately 1000 mm (39.4 in.)	*b	Approximately 1500 mm (59.1 in.)
*c	Approximately 650 mm (25.6 in.)	*d	Approximately 100 mm (3.9 in.)

Figure 4. Sides

*a	Approximately 250 mm (9.8 in.)	*b	Approximately 400 mm (15.7 in.)
*c	Approximately 100 mm (3.9 in.)	-	-

DIAGNOSIS
1. If a system malfunction is detected, the clearance warning ECU assembly stores Diagnostic Trouble Codes (DTCs) in its memory. For details, refer to the Repair Manual.