Toyota 4Runner: Operation Check

OPERATION CHECK

1. CHECK INITIAL CHECK FUNCTION

(a) Check the initial check function for the buzzer.

(1) When the back sonar or clearance sonar switch assembly is turned on, check that the following occurs: 1) after 0.2 seconds, the buzzer sounds for approximately 0.7 to 1.3 seconds, and 2) the system starts the obstacle detection operation.

(b) Check the initial check function for the sensor.

2. MALFUNCTION DISPLAY (MULTI-INFORMATION DISPLAY)

(a) 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.

HINT:

The example shows an open circuit in the ultrasonic sensor (front left sensor).

(b) 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.

3. DETECTION RANGE MEASUREMENT AND DISPLAY INSPECTION

(a) Detection range measurement:

NOTICE:

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.

(b) Turn the clearance sonar main switch on.

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

NOTICE:

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).

HINT:

Have an assistant move the pole.

(1) Clearance Sonar

Text in Illustration

*a	Approx. 950 mm (37.4 in.)	*b	Approx. 600 mm (23.6 in.)
*c	Approx. 500 mm (19.7 in.)	*d	Approx. 200 mm (7.9 in.)
	Hatched Area	-	-

NOTICE:

The No. 1 ultrasonic sensor side view detection range hatched area (labeled *1) represents the cross section of the top view of the lines of detection range A. The hatched area *1 does not represent the entire side view detection range.

(2) Back Sonar

Text in Illustration

*a	Approx. 1800 mm (70.9 in.)	*b	Approx. 1350 mm (53.1 in.)
*c	Approx. 1500 mm (59.1 in.)	*d	Approx. 200 mm (7.9 in.)
*e	Wall	*f	Approx. 600 mm (23.6 in.)
	Hatched Area	-	-

(d) When the ultrasonic sensors (front corner sonar) have detected an obstacle, check the displays and check that the buzzer sounds.

Operation Condition

Ignition Switch	Clearance Sonar Main Switch	Shift Lever Position	Vehicle Speed
ON	On	In any position other than P	Less than approximately 15 km/h (9.3 mph) if speed is increasing Less than approximately 10 km/h (6.2 mph) if speed is decreasing

Standard:

Multi-information Display and Buzzer

Detection Range	During Judgment	Obstacle
*1 Close-range detection Within approx. 300 +/- 30 mm (11.8 +/- 1.2 in.)	Buzzer: Sounds continuously	60 mm (2.36 in.) diameter pole
*2 Medium-range detection From approx. 300 +/- 30 to 450 +/- 50 mm (11.8 +/- 1.2 to 15.7 +/- 1.6 in.)	Buzzer: Sounds intermittently (ON: 0.075 sec. / OFF: 0.075 sec.)	60 mm (2.36 in.) diameter pole
*3 Long-range detection From approx. 450+/- 50 to 600 +/- 60 mm (17.7 +/- 2.0 to 23.6 +/- 2.4 in.)	Buzzer: Sounds intermittently (ON: 0.15 sec. / OFF: 0.15 sec.)	60 mm (2.36 in.) diameter pole

HINT:

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

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

Operation Condition

Ignition Switch	Clearance Sonar Main Switch	Shift Lever Position	Vehicle Speed
ON	On	R	-

Standard:

Multi-information Display and Buzzer

Detection Range	During Judgment	Obstacle
*1 Close-range detection Within approx. 300 +/- 30 mm (11.8 +/- 1.2 in.)	Buzzer: Sounds continuously	60 mm (2.36 in.) diameter pole
*2 Medium-range detection From approx. 300 +/- 30 to 450 +/- 50 mm (11.8 +/- 1.2 to 17.7 +/- 2.0 in.)	Buzzer: Sounds intermittently (ON: 0.075 sec. / OFF: 0.075 sec.)	60 mm (2.36 in.) diameter pole
*3 Long-range detection From approx. 450+/- 50 to 600 +/- 60 mm (17.7 +/- 2.0 to 23.6 +/- 2.4 in.)	Buzzer: Sounds intermittently (ON: 0.15 sec. / OFF: 0.15 sec.)	60 mm (2.36 in.) diameter pole

HINT:

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

(f) When the ultrasonic sensors (back sonar) have detected an obstacle, check the displays and check that the buzzer sounds.

Operation Condition

Ignition Switch	Clearance Sonar Main Switch	Shift Lever Position	Vehicle Speed
ON	On	R	-

Standard:

Multi-information Display and Buzzer

Detection Range	During Detection	Obstacle
*1 Close-range detection Within approx. 350 +/- 40 mm (13.8 +/- 1.6 in.)	Buzzer: Sounds continuously	60 mm (2.36 in.) diameter pole
*2 Medium-range detection From approx. 350 +/- 40 to 450 +/- 50 mm (13.8 +/- 1.6 to 17.7 +/- 2.0 in.)	Buzzer: Sounds intermittently (ON: 0.075 sec. / OFF: 0.075 sec.)	60 mm (2.36 in.) diameter pole
*3 Long-range detection From approx. 450 +/- 50 to 600 +/- 60 mm (17.7 +/- 2.0 to 23.6 +/- 2.4 in.)	Buzzer: Sounds intermittently (ON: 0.15 sec. / OFF: 0.15 sec.)	60 mm (2.36 in.) diameter pole
*4 Longest-range detection From approx. 600 +/- 60 to 1500 +/- 150 mm (23.6 +/- 2.4 to 59.1 +/- 5.9 in.)	Buzzer: Sounds intermittently (ON: 0.15 sec. / OFF: 0.65 sec.)	Wall

HINT:

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