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Home >> Toyota >> 2020 >> Highlander L, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 20 (Intuitive Parking Assist System - Diagnostic Codes & Circuit Tests) >> Intuitive Parking Assist System >> Sensor Frozen Indication (Dirty or Frozen) [11/2023 - ] >> Procedure

Sensor Frozen Indication (Dirty or Frozen) [11/2023 - ]: Procedure

WARNING: This page is about a different car, the 2025 Toyota Highlander and 2024 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
  1. READ VALUE USING GTS 
    1. Enter the following menus: Body Electrical / Clearance Warning / Data List.
    2. Read the Data List according to the display on the GTS.

      Body Electrical > Clearance Warning > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Ultrasonic Sensor (Front Right Center) Temporarily Unavailable - Circuit Open Open circuit status of the ultrasonic sensor NO/YES NO: No sensor open circuit
      YES: Sensor open circuit      		 RoB X20C4 is output if YES
      Ultrasonic Sensor (Front Right Center) Temporarily Unavailable - Freeze/Dirt Frozen/dirty status of the ultrasonic sensor NO/YES NO: Sensor not frozen/dirty
      YES: Sensor frozen/dirty      		 RoB X20C4 is output if YES
      Ultrasonic Sensor (Front Right Center) Temporarily Unavailable - Foreign Material Fixing Foreign matter stuck status of the ultrasonic sensor NO/YES NO: Foreign matter not stuck on sensor
      YES: Foreign matter stuck on sensor      		 RoB X20C4 is output if YES
      Ultrasonic Sensor (Front Right Center) Temporarily Unavailable - Parameter Malfunction Parameter malfunction status of the ultrasonic sensor NO/YES NO: No sensor parameter malfunction
      YES: Sensor parameter malfunction      		 RoB X20C4 is output if YES
      Ultrasonic Sensor (Front Right Center) Temporarily Unavailable - Flowing Water Continuously Continuous running water status of the ultrasonic sensor NO/YES NO: No sensor continuous running water
      YES: Sensor continuous running water      		 RoB X20C4 is output if YES
      Ultrasonic Sensor (Front Left Center) Temporarily Unavailable - Circuit Open Open circuit status of the ultrasonic sensor NO/YES NO: No sensor open circuit
      YES: Sensor open circuit      		 RoB X20C5 is output if YES
      Ultrasonic Sensor (Front Left Center) Temporarily Unavailable - Freeze/Dirt Frozen/dirty status of the ultrasonic sensor NO/YES NO: Sensor not frozen/dirty
      YES: Sensor frozen/dirty      		 RoB X20C5 is output if YES
      Ultrasonic Sensor (Front Left Center) Temporarily Unavailable - Foreign Material Fixing Foreign matter stuck status of the ultrasonic sensor NO/YES NO: Foreign matter not stuck on sensor
      YES: Foreign matter stuck on sensor      		 RoB X20C5 is output if YES
      Ultrasonic Sensor (Front Left Center) Temporarily Unavailable - Parameter Malfunction Parameter malfunction status of the ultrasonic sensor NO/YES NO: No sensor parameter malfunction
      YES: Sensor parameter malfunction      		 RoB X20C5 is output if YES
      Ultrasonic Sensor (Front Left Center) Temporarily Unavailable - Flowing Water Continuously Continuous running water status of the ultrasonic sensor NO/YES NO: No sensor continuous running water
      YES: Sensor continuous running water      		 RoB X20C5 is output if YES
      Ultrasonic Sensor (Front Right Corner) Temporarily Unavailable - Circuit Open Open circuit status of the ultrasonic sensor NO/YES NO: No sensor open circuit
      YES: Sensor open circuit      		 RoB X20C6 is output if YES
      Ultrasonic Sensor (Front Right Corner) Temporarily Unavailable - Freeze/Dirt Frozen/dirty status of the ultrasonic sensor NO/YES NO: Sensor not frozen/dirty
      YES: Sensor frozen/dirty      		 RoB X20C6 is output if YES
      Ultrasonic Sensor (Front Right Corner) Temporarily Unavailable - Foreign Material Fixing Foreign matter stuck status of the ultrasonic sensor NO/YES NO: Foreign matter not stuck on sensor
      YES: Foreign matter stuck on sensor      		 RoB X20C6 is output if YES
      Ultrasonic Sensor (Front Right Corner) Temporarily Unavailable - Parameter Malfunction Parameter malfunction status of the ultrasonic sensor NO/YES NO: No sensor parameter malfunction
      YES: Sensor parameter malfunction      		 RoB X20C6 is output if YES
      Ultrasonic Sensor (Front Right Corner) Temporarily Unavailable - Flowing Water Continuously Continuous running water status of the ultrasonic sensor NO/YES NO: No sensor continuous running water
      YES: Sensor continuous running water      		 RoB X20C6 is output if YES
      Ultrasonic Sensor (Front Left Corner) Temporarily Unavailable - Circuit Open Open circuit status of the ultrasonic sensor NO/YES NO: No sensor open circuit
      YES: Sensor open circuit      		 RoB X20C7 is output if YES
      Ultrasonic Sensor (Front Left Corner) Temporarily Unavailable - Freeze/Dirt Frozen/dirty status of the ultrasonic sensor NO/YES NO: Sensor not frozen/dirty
      YES: Sensor frozen/dirty      		 RoB X20C7 is output if YES
      Ultrasonic Sensor (Front Left Corner) Temporarily Unavailable - Foreign Material Fixing Foreign matter stuck status of the ultrasonic sensor NO/YES NO: Foreign matter not stuck on sensor
      YES: Foreign matter stuck on sensor      		 RoB X20C7 is output if YES
      Ultrasonic Sensor (Front Left Corner) Temporarily Unavailable - Parameter Malfunction Parameter malfunction status of the ultrasonic sensor NO/YES NO: No sensor parameter malfunction
      YES: Sensor parameter malfunction      		 RoB X20C7 is output if YES
      Ultrasonic Sensor (Front Left Corner) Temporarily Unavailable - Flowing Water Continuously Continuous running water status of the ultrasonic sensor NO/YES NO: No sensor continuous running water
      YES: Sensor continuous running water      		 RoB X20C7 is output if YES
      Ultrasonic Sensor (Rear Right Center) Temporarily Unavailable - Circuit Open Open circuit status of the ultrasonic sensor NO/YES NO: No sensor open circuit
      YES: Sensor open circuit      		 RoB X20C8 is output if YES
      Ultrasonic Sensor (Rear Right Center) Temporarily Unavailable - Freeze/Dirt Frozen/dirty status of the ultrasonic sensor NO/YES NO: Sensor not frozen/dirty
      YES: Sensor frozen/dirty      		 RoB X20C8 is output if YES
      Ultrasonic Sensor (Rear Right Center) Temporarily Unavailable - Foreign Material Fixing Foreign matter stuck status of the ultrasonic sensor NO/YES NO: Foreign matter not stuck on sensor
      YES: Foreign matter stuck on sensor      		 RoB X20C8 is output if YES
      Ultrasonic Sensor (Rear Right Center) Temporarily Unavailable - Foreign Material Fixing (Curl Up) Foreign matter stuck (curl up) status of the ultrasonic sensor NO/YES NO: Foreign matter not stuck (curl up) on sensor
      YES: Foreign matter stuck (curl up) on sensor      		 RoB X20C8 is output if YES
      Ultrasonic Sensor (Rear Right Center) Temporarily Unavailable - Parameter Malfunction Parameter malfunction status of the ultrasonic sensor NO/YES NO: No sensor parameter malfunction
      YES: Sensor parameter malfunction      		 RoB X20C8 is output if YES
      Ultrasonic Sensor (Rear Right Center) Temporarily Unavailable - Flowing Water Continuously Continuous running water status of the ultrasonic sensor NO/YES NO: No sensor continuous running water
      YES: Sensor continuous running water      		 RoB X20C8 is output if YES
      Ultrasonic Sensor (Rear Left Center) Temporarily Unavailable - Circuit Open Open circuit status of the ultrasonic sensor NO/YES NO: No sensor open circuit
      YES: Sensor open circuit      		 RoB X20C9 is output if YES
      Ultrasonic Sensor (Rear Left Center) Temporarily Unavailable - Freeze/Dirt Frozen/dirty status of the ultrasonic sensor NO/YES NO: Sensor not frozen/dirty
      YES: Sensor frozen/dirty      		 RoB X20C9 is output if YES
      Ultrasonic Sensor (Rear Left Center) Temporarily Unavailable - Foreign Material Fixing Foreign matter stuck status of the ultrasonic sensor NO/YES NO: Foreign matter not stuck on sensor
      YES: Foreign matter stuck on sensor      		 RoB X20C9 is output if YES
      Ultrasonic Sensor (Rear Left Center) Temporarily Unavailable - Foreign Material Fixing (Curl Up) Foreign matter stuck (curl up) status of the ultrasonic sensor NO/YES NO: Foreign matter not stuck (curl up) on sensor
      YES: Foreign matter stuck (curl up) on sensor      		 RoB X20C9 is output if YES
      Ultrasonic Sensor (Rear Left Center) Temporarily Unavailable - Parameter Malfunction Parameter malfunction status of the ultrasonic sensor NO/YES NO: No sensor parameter malfunction
      YES: Sensor parameter malfunction      		 RoB X20C9 is output if YES
      Ultrasonic Sensor (Rear Left Center) Temporarily Unavailable - Flowing Water Continuously Continuous running water status of the ultrasonic sensor NO/YES NO: No sensor continuous running water
      YES: Sensor continuous running water      		 RoB X20C9 is output if YES
      Ultrasonic Sensor (Rear Right Corner) Temporarily Unavailable - Circuit Open Open circuit status of the ultrasonic sensor NO/YES NO: No sensor open circuit
      YES: Sensor open circuit      		 RoB X20CA is output if YES
      Ultrasonic Sensor (Rear Right Corner) Temporarily Unavailable - Freeze/Dirt Frozen/dirty status of the ultrasonic sensor NO/YES NO: Sensor not frozen/dirty
      YES: Sensor frozen/dirty      		 RoB X20CA is output if YES
      Ultrasonic Sensor (Rear Right Corner) Temporarily Unavailable - Foreign Material Fixing Foreign matter stuck status of the ultrasonic sensor NO/YES NO: Foreign matter not stuck on sensor
      YES: Foreign matter stuck on sensor      		 RoB X20CA is output if YES
      Ultrasonic Sensor (Rear Right Corner) Temporarily Unavailable - Foreign Material Fixing (Curl Up) Foreign matter stuck (curl up) status of the ultrasonic sensor NO/YES NO: Foreign matter not stuck (curl up) on sensor
      YES: Foreign matter stuck (curl up) on sensor      		 RoB X20CA is output if YES
      Ultrasonic Sensor (Rear Right Corner) Temporarily Unavailable - Parameter Malfunction Parameter malfunction status of the ultrasonic sensor NO/YES NO: No sensor parameter malfunction
      YES: Sensor parameter malfunction      		 RoB X20CA is output if YES
      Ultrasonic Sensor (Rear Right Corner) Temporarily Unavailable - Flowing Water Continuously Continuous running water status of the ultrasonic sensor NO/YES NO: No sensor continuous running water
      YES: Sensor continuous running water      		 RoB X20CA is output if YES
      Ultrasonic Sensor (Rear Left Corner) Temporarily Unavailable - Circuit Open Open circuit status of the ultrasonic sensor NO/YES NO: No sensor open circuit
      YES: Sensor open circuit      		 RoB X20CB is output if YES
      Ultrasonic Sensor (Rear Left Corner) Temporarily Unavailable - Freeze/Dirt Frozen/dirty status of the ultrasonic sensor NO/YES NO: Sensor not frozen/dirty
      YES: Sensor frozen/dirty      		 RoB X20CB is output if YES
      Ultrasonic Sensor (Rear Left Corner) Temporarily Unavailable - Foreign Material Fixing Foreign matter stuck status of the ultrasonic sensor NO/YES NO: Foreign matter not stuck on sensor
      YES: Foreign matter stuck on sensor      		 RoB X20CB is output if YES
      Ultrasonic Sensor (Rear Left Corner) Temporarily Unavailable - Foreign Material Fixing (Curl Up) Foreign matter stuck (curl up) status of the ultrasonic sensor NO/YES NO: Foreign matter not stuck (curl up) on sensor
      YES: Foreign matter stuck (curl up) on sensor      		 RoB X20CB is output if YES
      Ultrasonic Sensor (Rear Left Corner) Temporarily Unavailable - Parameter Malfunction Parameter malfunction status of the ultrasonic sensor NO/YES NO: No sensor parameter malfunction
      YES: Sensor parameter malfunction      		 RoB X20CB is output if YES
      Ultrasonic Sensor (Rear Left Corner) Temporarily Unavailable - Flowing Water Continuously Continuous running water status of the ultrasonic sensor NO/YES NO: No sensor continuous running water
      YES: Sensor continuous running water      		 RoB X20CB is output if YES

      Body Electrical > Clearance Warning > Data List 

      Tester Display
      Ultrasonic Sensor (Front Right Center) Temporarily Unavailable - Circuit Open
      Ultrasonic Sensor (Front Right Center) Temporarily Unavailable - Freeze/Dirt
      Ultrasonic Sensor (Front Right Center) Temporarily Unavailable - Foreign Material Fixing
      Ultrasonic Sensor (Front Right Center) Temporarily Unavailable - Parameter Malfunction
      Ultrasonic Sensor (Front Right Center) Temporarily Unavailable - Flowing Water Continuously
      Ultrasonic Sensor (Front Left Center) Temporarily Unavailable - Circuit Open
      Ultrasonic Sensor (Front Left Center) Temporarily Unavailable - Freeze/Dirt
      Ultrasonic Sensor (Front Left Center) Temporarily Unavailable - Foreign Material Fixing
      Ultrasonic Sensor (Front Left Center) Temporarily Unavailable - Parameter Malfunction
      Ultrasonic Sensor (Front Left Center) Temporarily Unavailable - Flowing Water Continuously
      Ultrasonic Sensor (Front Right Corner) Temporarily Unavailable - Circuit Open
      Ultrasonic Sensor (Front Right Corner) Temporarily Unavailable - Freeze/Dirt
      Ultrasonic Sensor (Front Right Corner) Temporarily Unavailable - Foreign Material Fixing
      Ultrasonic Sensor (Front Right Corner) Temporarily Unavailable - Parameter Malfunction
      Ultrasonic Sensor (Front Right Corner) Temporarily Unavailable - Flowing Water Continuously
      Ultrasonic Sensor (Front Left Corner) Temporarily Unavailable - Circuit Open
      Ultrasonic Sensor (Front Left Corner) Temporarily Unavailable - Freeze/Dirt
      Ultrasonic Sensor (Front Left Corner) Temporarily Unavailable - Foreign Material Fixing
      Ultrasonic Sensor (Front Left Corner) Temporarily Unavailable - Parameter Malfunction
      Ultrasonic Sensor (Front Left Corner) Temporarily Unavailable - Flowing Water Continuously
      Ultrasonic Sensor (Rear Right Center) Temporarily Unavailable - Circuit Open
      Ultrasonic Sensor (Rear Right Center) Temporarily Unavailable - Freeze/Dirt
      Ultrasonic Sensor (Rear Right Center) Temporarily Unavailable - Foreign Material Fixing
      Ultrasonic Sensor (Rear Right Center) Temporarily Unavailable - Foreign Material Fixing (Curl Up)
      Ultrasonic Sensor (Rear Right Center) Temporarily Unavailable - Parameter Malfunction
      Ultrasonic Sensor (Rear Right Center) Temporarily Unavailable - Flowing Water Continuously
      Ultrasonic Sensor (Rear Left Center) Temporarily Unavailable - Circuit Open
      Ultrasonic Sensor (Rear Left Center) Temporarily Unavailable - Freeze/Dirt
      Ultrasonic Sensor (Rear Left Center) Temporarily Unavailable - Foreign Material Fixing
      Ultrasonic Sensor (Rear Left Center) Temporarily Unavailable - Foreign Material Fixing (Curl Up)
      Ultrasonic Sensor (Rear Left Center) Temporarily Unavailable - Parameter Malfunction
      Ultrasonic Sensor (Rear Left Center) Temporarily Unavailable - Flowing Water Continuously
      Ultrasonic Sensor (Rear Right Corner) Temporarily Unavailable - Circuit Open
      Ultrasonic Sensor (Rear Right Corner) Temporarily Unavailable - Freeze/Dirt
      Ultrasonic Sensor (Rear Right Corner) Temporarily Unavailable - Foreign Material Fixing
      Ultrasonic Sensor (Rear Right Corner) Temporarily Unavailable - Foreign Material Fixing (Curl Up)
      Ultrasonic Sensor (Rear Right Corner) Temporarily Unavailable - Parameter Malfunction
      Ultrasonic Sensor (Rear Right Corner) Temporarily Unavailable - Flowing Water Continuously
      Ultrasonic Sensor (Rear Left Corner) Temporarily Unavailable - Circuit Open
      Ultrasonic Sensor (Rear Left Corner) Temporarily Unavailable - Freeze/Dirt
      Ultrasonic Sensor (Rear Left Corner) Temporarily Unavailable - Foreign Material Fixing
      Ultrasonic Sensor (Rear Left Corner) Temporarily Unavailable - Foreign Material Fixing (Curl Up)
      Ultrasonic Sensor (Rear Left Corner) Temporarily Unavailable - Parameter Malfunction
      Ultrasonic Sensor (Rear Left Corner) Temporarily Unavailable - Flowing Water Continuously

      Result

      Result Proceed to
      Sensor frozen history displays "YES" A
      Sensor frozen history displays "NO" B

    Result: 

    B 

    See step  3

    Result: 

    A 

    See step  2

  2. CLEAN ULTRASONIC SENSORS 
    1. Clean the ultrasonic sensor from dirty or frozen.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    END 

  3. CHECK FOR DTC 
    1. According to the display on the GTS, check for DTCs.

      Body Electrical > Clearance Warning > Trouble Codes 

    2. According to the display on the GTS, clear the DTCs.

      Body Electrical > Clearance Warning > Clear DTCs 

    3. Recheck for DTCs

      Body Electrical > Clearance Warning > Trouble Codes 

      Result

      Result Proceed to
      DTCs are not output A
      DTC is output (for Front) B
      DTC is output (for Rear) C

    Result: 

    A 

    REPLACE CLEARANCE WARNING ECU ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

    Result: 

    B 

    REPLACE ULTRASONIC SENSOR (for Front). Refer to  REMOVAL [11/2023 - ] 

    Result: 

    C 

    REPLACE ULTRASONIC SENSOR (for Rear). Refer to  REMOVAL [11/2023 - ] 

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