Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Calibration

CALIBRATION

NOTICE:

When any of the following parts have been replaced, perform adjustment shown in the following table. If not, the intelligent clearance sonar system may not operate correctly.

PRECAUTION (PROCEDURE 1)

(a) The necessary procedures (adjustment, calibration, initialization or registration) that must be performed after parts are removed and installed, or replaced during intelligent clearance sonar system removal/installation are shown below.

For the installation location of the ultrasonic sensors, refer to Parts Location.

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Part Name	Operation	Adjustment Item	Proceed to
Steering sensor	Removal and installation of the steering sensor Removal and installation of the connector of the steering sensor Replacement	Steering angle neutral point (Initialize intelligent clearance sonar system)*	Procedure 4
Suspension, tires, etc.	The vehicle height changes because of suspension or tire replacement	Ultrasonic sensor detection angle	Procedure 2, 3
		Ultrasonic sensor detection angle registration	Procedure 4
Front bumper assembly	Replacement Installation position of the front bumper assembly changes because of the removal and installation of the front bumper assembly	Ultrasonic sensor detection angle	Procedure 2, 3
		Ultrasonic sensor detection angle registration	Procedure 4
Rear bumper assembly	Replacement Installation position of the rear bumper assembly changes because of the removal and installation of the rear bumper assembly	Ultrasonic sensor detection angle	Procedure 2, 3
		Ultrasonic sensor detection angle registration	Procedure 4
Clearance warning ECU assembly	Replacement	Ultrasonic sensor detection angle	Procedure 2, 3
		Steering angle neutral point	Procedure 4
		Bumper type registration
		Ultrasonic sensor detection angle registration
Ultrasonic sensor	Removal and installation Replacement	Ultrasonic sensor detection angle	Procedure 2, 3
		Ultrasonic sensor detection angle registration	Procedure 4
	An ultrasonic sensor becomes misaligned	Ultrasonic sensor detection angle	Procedure 2, 3
		Ultrasonic sensor detection angle registration	Procedure 4
	An ultrasonic sensor is subjected to impact	Ultrasonic sensor detection angle	Procedure 2, 3
		Ultrasonic sensor detection angle registration	Procedure 4
Battery	Cable is disconnected from the negative (-) battery terminal	Steering angle neutral point*	Procedure 4

PREPARATION (PROCEDURE 2)

(a) Preparation

SST: 09989-00020

(b) Confirm levelness of floor surface.

(1) Place a bubble level on a level surface and confirm that the bubble is centered.

NOTICE:

Make sure that there is no gravel, sand, etc., and that the surface is not undulating.

HINT:

By adjusting the direction of the bubble level, it is possible to find a position where the bubble is centered.

(2) Turn on the digital angle gauge.

(3) Place the digital angle gauge in the same location and direction as that of the bubble level where the levelness of the surface was confirmed.

NOTICE:

Confirm that the location and direction of the digital angle gauge is exactly the same as that of the bubble level.

*a

Digital Angle Gauge

*b

Level

(4) Press the "ZERO" switch to memorize the zero point (perfectly level).

NOTICE:

Make sure that the digital angle gauge does not move when pressing the switch. If the digital angle gauge moves when the switch is pressed, an incorrect zero point may be memorized and it will not be possible to accurately check for levelness.

(5) Using the digital angle gauge in which the zero point (perfectly level) has been memorized, measure the angle of the floor surface at the 4 positions at the front of the vehicle and the 4 positions at the rear of the vehicle as shown in the illustration. Write the measured values into the following worksheet.

HINT:

If necessary, the digital angle gauge can be placed anywhere within the specified area when measuring the angle of the floor surface for positions A, C, F and H.

	Confirmation Area	-	-
*a	50 mm (1.97 in.)	*b	250 mm (9.84 in.)
*c	100 mm (3.94 in.)	-	-

(6) Using the following worksheet, calculate the average of the measurements taken at the 4 positions in front of the vehicle, and calculate the average of the measurements taken at the 4 positions behind the vehicle. Confirm that the front measurement average and the rear measurement average are not more than approximately 0.37 degrees. Also, confirm that the front measurement average and the rear measurement average is less than 0.2 degrees.

NOTICE:

If the front measurement average and the rear measurement average are more than approximately 0.37 degrees or the difference between the front measurement average and the rear measurement average is 0.2 degrees or more, choose another work area as it is not possible to accurately check the installation angle of the sensors.

Worksheet:

(7) Average the front measurement average and the rear measurement average, then round the answer to 1 decimal place (E.g. 0.0927 degrees is rounded to 0.1 degrees) to obtain the floor surface inclination value.

(8) Calibrate the digital angle gauge

Adjust the angle of the digital angle gauge until it reads the same value of the floor surface inclination, then press the "ZERO" switch to memorize the zero point (level with floor surface).

NOTICE:

Before pressing the "ZERO" switch, confirm that the digital angle gauge reading is positive if the floor angle inclination is positive, and negative if the floor angle inclination is negative.

(c) Prepare the digital angle gauge

(1) Attach the digital angle gauge attachment to the digital angle gauge.

SST: 09989-00020

(2) Attach masking tape to the digital angle gauge attachment.

(d) Remove all luggage from the vehicle.

(e) Adjust the tire inflation pressure to the specified pressure.

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(f) Check the height of the vehicle.

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SENSOR HEIGHT AND ALIGNMENT INSPECTION (PROCEDURE 3)

HINT:

Check if the installation angle of each ultrasonic sensor is appropriate.

(a) Preparation

(1) Visually check that the bumper, grill and ultrasonic sensors are installed properly and are not damaged.

NOTICE:

If the bumper, grill or any ultrasonic sensor is not installed correctly, the calibration may not be able to be completed.

(2) Check the tire pressures and adjust them if necessary.

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(b) Sensor height and alignment inspection

*1	Front Corner Ultrasonic Sensor RH	*2	Front Center Ultrasonic Sensor RH
*3	Front Center Ultrasonic Sensor LH	*4	Front Corner Ultrasonic Sensor LH
*5	Rear Corner Ultrasonic Sensor RH	*6	Rear Center Ultrasonic Sensor RH
*7	Rear Center Ultrasonic Sensor LH	*8	Rear Corner Ultrasonic Sensor LH

(c) Measure the installation height of the sensors.

*a	Center of Sensor
*b	Sensor Height

for Bar Type Radiator Grille (without Rear No. 2 Seat):

Standard Height (Front Bumper):

Sensor Location	Specified Condition
Front Center Ultrasonic Sensor	493.8 to 550.6 mm (19.4 to 21.7 in.)
Front Corner Ultrasonic Sensor	714.0 to 770.5 mm (28.1 to 30.3 in.)

Standard Height (Rear Bumper):

Sensor Location	Specified Condition
Rear Center Ultrasonic Sensor	537.7 to 722.6 mm (21.2 to 28.4 in.)
Rear Corner Ultrasonic Sensor	542.0 to 722.6 mm (21.3 to 28.4 in.)

for Mesh Type Radiator Grille (without Rear No. 2 Seat):

Standard Height (Front Bumper):

Sensor Location	Specified Condition
Front Center Ultrasonic Sensor	507.0 to 563.9 mm (20.0 to 22.2 in.)
Front Corner Ultrasonic Sensor	714.0 to 770.5 mm (28.1 to 30.3 in.)

Standard Height (Rear Bumper):

Sensor Location	Specified Condition
Rear Center Ultrasonic Sensor	537.7 to 722.6 mm (21.2 to 28.4 in.)
Rear Corner Ultrasonic Sensor	542.0 to 722.6 mm (21.3 to 28.4 in.)

for Bar Type Radiator Grille (with Rear No. 2 Seat):

Standard Height (Front Bumper):

Sensor Location	Specified Condition
Front Center Ultrasonic Sensor	486.2 to 543.2 mm (19.1 to 21.4 in.)
Front Corner Ultrasonic Sensor	707.3 to 763.6 mm (27.8 to 30.1 in.)

Standard Height (Rear Bumper):

Sensor Location	Specified Condition
Rear Center Ultrasonic Sensor	533.6 to 728.6 mm (21.0 to 28.7 in.)
Rear Corner Ultrasonic Sensor	532.0 to 723.6 mm (20.9 to 28.5 in.)

NOTICE:

If the installation height of a sensor is not as specified, it may not be possible to measure the sensor angles correctly. If so, unload the vehicle and measure the installation height of the sensors again.

HINT:

Use the center of the sensor as the measuring point.

(d) Using the digital angle gauge, measure the angles of each sensor. Write down the measured values.

*a	Digital angle gauge
*b	Digital angle gauge attachment
*c	Ultrasonic Sensor

(1) Measure the angle of the front sensors as shown in the illustration.

NOTICE:

Ensure that the digital angle gauge is flush with the face of the sensor.

(2) Measure the angle of the rear sensors.

NOTICE:

Ensure that the digital angle gauge is flush with the face of the sensor.

(3) Confirm that the angles of the sensors are as specified.

NOTICE:

The sensor angle is the measured sensor angle subtracted from 90°.

for Bar Type Radiator Grille (without Rear No. 2 Seat):

Standard Height (Front Bumper):

Sensor Location	Specified Condition
Front Center Ultrasonic Sensor	-2.18 to 4.96°
Front Corner Ultrasonic Sensor	-1.88 to 5.26°

Standard Height (Rear Bumper):

Sensor Location	Specified Condition
Rear Center Ultrasonic Sensor	1.16 to 7.91°
Rear Corner Ultrasonic Sensor	0.2 to 7.01°

for Mesh Type Radiator Grille (without Rear No. 2 Seat):

Standard Height (Front Bumper):

Sensor Location	Specified Condition
Front Center Ultrasonic Sensor	-0.18 to 6.96°
Front Corner Ultrasonic Sensor	-1.88 to 5.26°

Standard Height (Rear Bumper):

Sensor Location	Specified Condition
Rear Center Ultrasonic Sensor	1.16 to 7.91°
Rear Corner Ultrasonic Sensor	0.2 to 7.01°

for Bar Type Radiator Grille (with Rear No. 2 Seat):

Standard Height (Front Bumper):

Sensor Location	Specified Condition
Front Center Ultrasonic Sensor	-2.48 to 4.66°
Front Corner Ultrasonic Sensor	-2.18 to 4.96°

Standard Height (Rear Bumper):

Sensor Location	Specified Condition
Rear Center Ultrasonic Sensor	0.56 to 7.31°
Rear Corner Ultrasonic Sensor	0.76 to 7.51°

*A	For example:
*a	Digital angle gauge
*b	Horizontal line
*c	Ultrasonic Sensor
*d	Digital angle gauge attachment
*e	+
*f	-

(4) If the angle or height of the sensors is not as specified, confirm that the installation is correct and then perform the inspection again.

REGISTRATION (PROCEDURE 4)

(a) Preparation

(1) Confirm that the following DTCs are not output.

System	Proceed to
Intelligent Clearance Sonar System
Intuitive Parking Assist System

NOTICE:

If DTC C1AEC, C1AED, C1AF0, C1AF3, C1AF4, C1AEA or C168D are output at this point, it is not a malfunction. Proceed with the calibration.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / Advanced Parking Guidance/ICS/Intuitive P/A / Utility.

Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Utility

Tester Display
Intuitive P/A Detection/Steering Adjustment

(f) According to the display on the Techstream, perform calibration.

HINT:

If "Battery or Steering Sensor" is selected, further calibration is not required. (Bumper type registration is not required.)

(g) Enter the bumper type using the Techstream.

Bumper Type	Value
for Bar Type Radiator Grille (without Rear No. 2 Seat)	1
for Mesh Type Radiator Grille (without Rear No. 2 Seat)	2
for Bar Type Radiator Grille (with Rear No. 2 Seat)	1

HINT:

If the clearance warning ECU assembly is replaced or removed and installed, it is necessary to perform bumper type registration.

(h) Using the Techstream, enter the measured sensor values.

NOTICE:

The sensor angle is the measured sensor angle subtracted from 90°.

HINT:

The digital angle gauge should indicate 90° when turned on its side.

(i) Disconnect the Techstream from the DLC3.