Toyota Prius: Front Side Radar Sensor

NOTICE:

• Do not drop the front side radar sensor.
• If the front side radar sensor is dropped, replace it with a new one.
• After replacing the front side radar sensor, make sure to perform ECU configuration.

HINT:

• The front side radar beam axis confirmation is performed to confirm whether the sensor's beam axis is correct, and to adjust the beam axis by using a reflector.
• When checking the installation condition of the front side radar sensor, make sure it is between 26 and 34° with respect to the Toyota Prius vehicle center line. Also, using a tool, perform a check to make sure that the sensor is aligned perpendicular to the ground ( /- 2.2°).

• Target Adjustment (Triangle Target):

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• Driving Adjustment:

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HINT:

• Purpose of adjustment
  • When replacing the front side radar sensor, perform front side radar sensor beam axis learning to ensure proper operation of the system.
• Beam Axis Direction

  *a	Beam Axis Direction

NOTICE:

• When performing the driving adjustment, obey all applicable traffic laws.
• Select a road where the driving adjustment can be carried out safely.
• Do not install anything other than a genuine bumper assembly.
• If the front bumper cover has been replaced or body repair has been performed at a radio wave transmission area, "driving adjustment" cannot be performed.

  *a	Bumper Rear Side	*b	Scribed Line
  	Radio Wave Transmission Area	-	-

  

  *a	282 mm (11.10 in.)	*b	48 mm (1.89 in.)
  *c	122 mm (4.80 in.)	*d	224 mm (8.82 in.)
  *e	79 mm (3.11 in.)	*f	291 mm (11.46 in.)
  *g	122 mm (4.80 in.)	*h	156 mm (6.14 in.)
  *j	146 mm (5.75 in.)	*k	206 mm (8.11 in.)
  	Radio Wave Transmission Area	-	-

• If body repairs have been performed, perform "Check Reflection Power".

  Click here

• Drive the Toyota Prius vehicle straight ahead at a speed of 10 km/h (6 mph) or more.
• Perform the adjustment outside during daytime, on a sunny or cloudy day.
• If preceding vehicles are present, they should be kept at a distance of at least 20 m (66 ft.)
• There is a stationary object on the roadside such as a guardrail.
• Ensure that there is no snow, ice, or foreign matter on the front or rear of the radar sensor cover or on the front surface of the sensor.

HINT:

• If the adjustment does not complete within a total cumulative time of 15 minutes when the vehicle is driven with all conditions met, perform the adjustment on another route.
• If the adjustment does not complete within a total cumulative time of 30 minutes when the Toyota Prius vehicle is driven with all conditions met, perform the adjustment using target recognition.
• If the vehicle is driven unsteadily or many lane changes are performed, the time taken for adjustment to complete may increase.

• Road environments conducive to adjustment

  *a	Roads with stationary metallic objects such as guard rails

• Road environments which hinder adjustment

  *a	Inside tunnels where there are many diffuse radar reflections	*b	Underneath elevated structures where there are many diffuse radar reflections
  *c	In residential neighborhoods where there are many diffuse radar reflections	*d	Snowy roads, dirt roads, etc., where there are very few radar reflections

NOTICE:

• Make sure to read "Before Starting Driving Adjustment" before proceeding with work.

  Click here

• Make sure that the alignment is suitable and non-standard tires are not installed.
• Make sure to perform the transition to online axis alignment mode with the Toyota Prius vehicle stopped.
• Transitioning to online axis alignment mode will erase the learning value, so make sure to complete the adjustment.
• Turning the ignition switch off while in online axis alignment mode will cause the system to exit online axis alignment mode, so to continue with the adjustment, it is necessary to transition to online axis alignment mode again.
• All of the driving support system functions will be inoperative while the adjustment is in progress.
• When driving the Toyota Prius vehicle with the GTS connected, be careful with how the wires are routed.
• If the adjustment does not complete within a total cumulative time of 15 minutes when the vehicle is driven with all conditions met, perform the adjustment on another route.
• If the adjustment does not complete within a total cumulative time of 30 minutes when the Toyota Prius vehicle is driven with all conditions met, perform the adjustment using target recognition.
• After adjustment is complete, to start the various systems it is necessary to turn the ignition switch off and then to ON again.
• In situations such as when the online axis alignment terminates abnormally, to perform online axis alignment again, turn the ignition switch off and then back to ON and enter online axis alignment mode again.
• If the front bumper cover has been replaced or body repair has been performed at a radio wave transmission area, "driving adjustment" cannot be performed.
• If body repairs have been performed, perform "Check Reflection Power".

  Click here

1. In accordance with the instructions on the screen press "Exit" and then disconnect the GTS from the DLC3.

NOTICE:

• In the case of abnormal termination, the buzzer sounds intermittently for 1 second.
• When driving with GTS connected to Toyota Prius vehicle:
  • If an error code is displayed, perform troubleshooting according to the following table, then perform the beam axis alignment again.
• When driving with GTS not connected to vehicle:
  • When the system terminates abnormally, connect the GTS and refer to the following error code table, then perform beam axis alignment again.

    Click here

1. Press "Exit" to exit the Online axis adjustment mode.

1. Connect the GTS to the DLC3.

HINT:

• If the value of "Beam Axis Adjustment Completion Status" is "Incompleted", perform "Online Axis Alignment Mode" again.
• The "A" is on the LH side and the "B" is on the RH side.

• When a minor collision is suspected.
• When body repairs have been performed on the Toyota Prius vehicle.
• For a vehicle in which the system frequently operates inappropriately or fails to operate.
• When a DTC for front side radar sensor (module "A") beam axis misalignment (horizontal) or front side radar sensor (module "B") beam axis misalignment (horizontal) has been stored.
• When Toyota Prius vehicle control history (RoB) code for front side radar sensor (module "A") blockage or front side radar sensor (module "B") blockage has been stored.
• When vehicle control history (RoB) code for front side radar sensor (module "A") blockage Level 2 or front side radar sensor (module "B") blockage Level 2 has been stored.
• If body repair has been performed at a radio wave transmission area of the front bumper cover, make sure to perform "Check Reflection Power".

  Click here

  

  *a	Bumper Rear Side	*b	Scribed Line
  	Radio Wave Transmission Area	-	-

  

  *a	282 mm (11.10 in.)	*b	48 mm (1.89 in.)
  *c	122 mm (4.80 in.)	*d	224 mm (8.82 in.)
  *e	79 mm (3.11 in.)	*f	291 mm (11.46 in.)
  *g	122 mm (4.80 in.)	*h	156 mm (6.14 in.)
  *j	146 mm (5.75 in.)	*k	206 mm (8.11 in.)
  	Radio Wave Transmission Area	-	-

NOTICE:

• Before replacing the front side radar sensor LH, read the values and then write them to the new front side radar sensor LH.
• Before replacing the front side radar sensor RH, read the values and then write them to the new front side radar sensor RH.

HINT:

• The front side radar beam axis confirmation is performed to confirm whether the sensor's beam axis is correct, and to adjust the beam axis by using a reflector.
• If body repairs have not been performed at a radio wave transmission area of the front bumper cover, select a target distance of 2500 mm (8.2 ft.) when performing front side radar beam axis confirmation.

NOTICE:

• Perform this inspection on level ground.
• Make sure that there are no metal objects around the Toyota Prius vehicle or on the ground.
• Unload the vehicle before beginning the inspection.
• Confirm that the tire pressure is correct before beginning the inspection.

  Click here

• Do not place any objects other than the reflector (such as a large metallic object) in the inspection area or allow people to enter the inspection area (W 6 m [19.68 ft.] x L 6 m [19.68 ft.] x H 3 m [9.84 ft.]) shown in the illustration.

1. Press the laser mode button on the laser line marker to activate the laser line emitters.
2. Align the laser beam ground marking point (cross portion) with point B.

   *a	Ground Marking Point (Cross Portion)

3. Align the center of the target panel with point A, and set the target panel so that it faces forward.

   *a

   Center Line

   *b

   Target Panel

4. Adjust the position of the laser line marker so that the laser beam is aligned with the center line of the target panel.
5. Using a laser marker, create a Toyota Prius vehicle center line that connects point A and point B.

   *a	Vehicle Center Line

1. Draw a Toyota Prius vehicle center line so that it passes through mark A and B (front and rear center points).

   *a	Toyota Prius Vehicle Center Line

NOTICE:

• Set the reflector so that its center is 551 mm (1.81 ft.) above the ground.

  *a	SST (reflector)
  *b	551 mm (1.81 ft.)

• The center of the triangular pyramid is the reference point for the setting position and angle.

  *a	Center of Triangular Pyramid

  

  *a	SST (reflector)

HINT:

• If the result of the front side radar beam axis display is within the specified range, then this adjustment has corrected the value to normal.
• "Reflector Reflection Power" is displayed after completing the front side radar beam axis adjustment, but is unnecessary if body repairs have not been performed at the radio wave transmission area of the front bumper cover.

1. Enter the following menus: Body Electrical / Front Radar Sensor / Utility / Radio Wave Irradiation Stop Mode Cancellation.

NOTICE:

• If body repairs have been performed at the radio wave transmission area of the front bumper cover, select a target distance of 2500 mm (8.2 ft.) and be sure to perform "Check Reflection Power".

  *a	Bumper Rear Side	*b	Scribed Line
  	Radio Wave Transmission Area	-	-

  

  *a	282 mm (11.10 in.)	*b	48 mm (1.89 in.)
  *c	122 mm (4.80 in.)	*d	224 mm (8.82 in.)
  *e	79 mm (3.11 in.)	*f	291 mm (11.46 in.)
  *g	122 mm (4.80 in.)	*h	156 mm (6.14 in.)
  *j	146 mm (5.75 in.)	*k	206 mm (8.11 in.)
  	Radio Wave Transmission Area	-	-

• "Check Reflection Power" enables the reflection power to be checked after beam axis alignment in accordance with the following procedure.

HINT:

• Since radio waves from the front side radar sensor pass through the front bumper cover, if body repairs have been performed at the radio wave transmission area, radio wave transmission may be attenuated.
• Perform "Check Reflection Power" with and without the front bumper assembly installed to check the difference.

NOTICE:

• Perform this inspection on level ground.
• Make sure that there are no metal objects around the Toyota Prius vehicle or on the ground.
• Unload the vehicle before beginning the inspection.
• Confirm that the tire pressure is correct before beginning the inspection.

  Click here

• Do not place any objects other than the reflector (such as a large metallic object) in the inspection area or allow people to enter the inspection area (W 6 m [19.68 ft.] x L 6 m [19.68 ft.] x H 3 m [9.84 ft.]) shown in the illustration.

1. Press the laser mode button on the laser line marker to activate the laser line emitters.
2. Align the laser beam ground marking point (cross portion) with point B.

   *a	Ground Marking Point (Cross Portion)

3. Align the center of the target panel with point A, and set the target panel so that it faces forward.

   *a

   Center Line

   *b

   Target Panel

4. Adjust the position of the laser line marker so that the laser beam is aligned with the center line of the target panel.
5. Using a laser marker, create a Toyota Prius vehicle center line that connects point A and point B.

   *a	Vehicle Center Line

1. Draw a Toyota Prius vehicle center line so that it passes through mark A and B (front and rear center points).

   *a	Toyota Prius Vehicle Center Line

NOTICE:

• Set the reflector so that its center is 551 mm (1.81 ft.) above the ground.

  *a	SST (reflector)
  *b	551 mm (1.81 ft.)

• The center of the triangular pyramid is the reference point for the setting position and angle.

  *a	Center of Triangular Pyramid

  

  *a	SST (reflector)

HINT:

• Do not move the reflector after removing the front bumper assembly, so that the process can be started again from "Front Side Radar Beam Axis Display" (*1).
• If the reflector is moved, variations in the measured values occur and the results cannot be accurately compared.

HINT:

• Subtract the value with the front bumper assembly removed from the value with the front bumper assembly installed, and then check the result.
• If different reflectors are used with the front bumper assembly installed and removed, the measured values will vary and the correct difference cannot be determined.

1. Suspect the following possible causes and perform the appropriate countermeasures:

   Possible Causes	Countermeasure
   When the front bumper cover panel was painted, too much paint base was applied. Excessive addition of aluminum primary color	Strip the front bumper cover back to its base material, and then repaint.
   Operation of the front side radar sensor is abnormal.	Replace the front side radar sensor.

   HINT:

   If the result is outside of the specified range, it is suspected that body repair performed on the front bumper cover is reducing the reflection power.

2. After performing the appropriate countermeasures above, perform the operation again from "Front Side Radar Beam Axis Display"(*1) and confirm that "Reflector Reflection Power" is within the acceptable range.

   HINT:

   Refer to the body repair manual "INTRODUCTION > WORK NOTICES AND PRECAUTIONS > PRECAUTIONS FOR FRONT SIDE RADAR SENSOR".

1. Enter the following menus: Body Electrical / Front Radar Sensor / Utility / Radio Wave Irradiation Stop Mode Cancellation.

NOTICE:

• After a minor collision has occurred or body repairs have been performed, etc., make sure to perform this inspection as there is a possibility that the installation angle has changed.
• Perform this inspection on level ground.
• Unload the Toyota Prius vehicle before beginning the inspection.
• Confirm that the tire pressure is correct before beginning the inspection.

  Click here

1. Press the laser mode button on the laser line marker to activate the laser line emitters.
2. Align the laser beam ground marking point (cross portion) with point B.

   *a	Ground Marking Point (Cross Portion)

3. Align the center of the target panel with point A, and set the target panel so that it faces forward.

   *a

   Center Line

   *b

   Target Panel

4. Adjust the position of the laser line marker so that the laser beam is aligned with the center line of the target panel.
5. Using a laser marker, create a Toyota Prius vehicle center line that connects point A and point B.

   *a	Vehicle Center Line

1. Draw a Toyota Prius vehicle center line so that it passes through mark A and B (front and rear center points).

   *a	Toyota Prius Vehicle Center Line

HINT:

• Make sure to use double-sided tape with the same thickness for both the left and right sides.
• If the thickness of the double-sided tape is different for the left and right sides, an accurate measurement cannot be performed.

1. Press the laser mode button on the laser line marker to activate the laser line emitters.
2. Adjust the position of the laser line marker so that the laser beam passes through point C and point D as shown in the illustration.

   *a	Ground Marking Point (Cross Portion)

3. Enlarge and print out the poster shown in the illustration.

   *a	Poster	*b	Toyota Prius Vehicle
   *c	Vehicle Center Line	*d	Intersection of Vehicle Center Line and extension lines of Point C and Point D
   	Allowable Range	-	-

   Standard:

   Part	Angle
   a	30°
   b	-4°
   c	4°

4. As shown in the illustration, attach the poster to the ground by aligning the center line of the Toyota Prius vehicle and point E. Then check that the horizontal angle of the front side radar sensor is within the allowable range.

   *a	Poster
   *b	Toyota Prius Vehicle Center Line
   *c	Point C
   *d	Point D

   Standard:

   Item	Allowable Range
   Front Side Radar Sensor (for LH Side)	26 to 34°
   Front Side Radar Sensor (for RH Side)	26 to 34°

1. Check that the following dimensions are obtained based on point C and point D.

   *A	Toyota Prius Vehicle Front (LH)
   *a	Vehicle Front
   *b	Vehicle Rear
   *c	Toyota Prius Vehicle Center Line
   *d	Line Parallel to Vehicle Center Line
   *e	Line Perpendicular to Vehicle Center Line

   Standard:

   Location	Measurement
   y	24 to 31 mm (0.94 to 1.22 in.)

   HINT:

   If the results are not as specified, it is possible that the front side radar sensor installation area (frame, head light assembly) is deformed, so make corrections as necessary.

HINT:

• The digital angle gauge should indicate 90° when turned on its side.
• The outward facing surface (installation angle) is positive ( ) when it faces higher than horizontal.