PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:C1AA8, C1AA9

DTC Code DTC Name
C1AA8 Front Camera Module Incorrect Axial Gap
C1AA9 Front Camera Module Beam Axis Not Adjusted

DESCRIPTION

If it is determined that the beam axis of the pre-crash safety city sensor is deviated, DTC C1AA8 is output. DTC C1AA9 is output when the system determines that camera beam axis learning has not been performed or has not been completed normally after a new pre-crash safety city sensor is installed.

DTC Code DTC Detection Condition Trouble Area
C1AA8 When the system is operating, a misaligned axis in the pre-crash safety city sensor is detected.

  • Pre-crash safety city sensor

  • Windshield glass
C1AA9 When the system is operating, an unadjusted axis in the pre-crash safety city sensor is detected.

  • Pre-crash safety city sensor

  • Windshield glass

CAUTION / NOTICE / HINT

Note


  • When replacing the pre-crash safety city sensor, replace it with a new one. If an ECU which was installed to another vehicle is used, the information stored in the pre-crash safety city sensor will not match the information from the vehicle and, as a result, a DTC may be output.

  • When replacing the pre-crash safety city sensor with a new one, or performing removal, installation or replacement of the windshield glass, always perform "Recognition Camera/Target Position Memory" and "Beam Axis Learning".

    Perform adjustment with either "ONE TIME RECOGNITION" or "SEQUENTIAL RECOGNITION".


  • When replacing the windshield glass of a vehicle equipped with a pre-crash safety city sensor, make sure to use a Toyota genuine part. If a non-Toyota genuine part is used, the pre-crash safety city sensor may not be able to be installed due to a missing bracket or the pre-crash safety system may not operate properly due to a difference in the transmissivity or black ceramic border.

PROCEDURE


  1. CHECK FOR DTCs


    1. Check whether output DTC is a current DTC.

    2. Check for DTCs Click here.

      Result
      Result Proceed to
      C1AA8 output as current DTC. A
      C1AA9 output as current DTC. B
      Only C1AA8 stored as history DTC. C

    B

    PERFORM PRE-CRASH SAFETY CITY SENSOR BEAM AXIS LEARNING Click here

    C

    CLEAR DTCs Click here

    A

  2. CHECK VEHICLE SITUATION CONFIRMATION


    1. Check the vehicle usage situation.

      Result
      Result Proceed to
      Vehicle is not currently used, and has not been used in the past, for carrying loads or towing. A
      Vehicle is currently used, or has been used in the past, for carrying loads or towing. B

    B

    PERFORM PRE-CRASH SAFETY CITY SENSOR BEAM AXIS LEARNING Click here

    A

  3. CHECK WHEEL ALIGNMENT


    1. Check the front and rear wheel alignment (toe misalignment).

      for front wheel alignment: Click here

      for rear wheel alignment: Click here

      Result
      Result Proceed to
      Front and rear wheel alignment (toe misalignment) is abnormal A
      Front and rear wheel alignment (toe misalignment) is normal B

    B

    CHECK PRE-CRASH SAFETY CITY SENSOR INSTALLATION Click here

    A

  4. ADJUST WHEEL ALIGNMENT


    1. Adjust the wheel alignment (toe alignment).

      for front wheel alignment: Click here

      for rear wheel alignment: Click here


    NEXT

  5. PERFORM PRE-CRASH SAFETY CITY SENSOR BEAM AXIS LEARNING


    1. Perform the "Recognition Camera/Target Position Memory" and "Beam Axis Learning" of pre-crash safety city .

      Perform adjustment with either "ONE TIME RECOGNITION" or "SEQUENTIAL RECOGNITION".



    NEXT

    END

  6. CHECK PRE-CRASH SAFETY CITY SENSOR INSTALLATION


    1. Check the installation condition of the pre-crash safety city sensor Click here.

      Tech Tips

      If there is a malfunction with the installation condition of the pre-crash safety city sensor, replace the windshield glass Click here.

      Result
      Result Proceed to
      No deformation or deviation in pre-crash safety city sensor installation bracket A
      Deformation or deviation in pre-crash safety city sensor installation bracket B

    B

    REPLACE WINDSHIELD GLASS Click here

    A

  7. PERFORM PRE-CRASH SAFETY CITY SENSOR BEAM AXIS LEARNING


    1. Perform the "Recognition Camera/Target Position Memory" and "Beam Axis Learning" of pre-crash safety city.

      Perform adjustment with either "ONE TIME RECOGNITION" or "SEQUENTIAL RECOGNITION".



    NEXT

  8. CHECK FOR DTCs


    1. Clear the DTCs Click here.

    2. Make sure that the DTC detection conditions are met.

      Tech Tips

      If the detection conditions are not met, the system cannot detect the malfunction.

    3. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC C1AA8 and C1AA9 are not output A
      DTC C1AA8 or C1AA9 is output B

    A

    END

    B

    REPLACE PRE-CRASH SAFETY CITY SENSOR Click here

  9. CLEAR DTCs


    1. Check whether there is a phenomena from the past vehicle usage condition that explains the axis misalignment of the pre-crash safety city sensor.

      Tech Tips

      When only history DTCs are output, DTCs may have been temporarily output due to overloading, etc., but then the system returned to normal due to learning control.

    2. Clear the DTCs Click here.


    NEXT

    END

  10. REPLACE WINDSHIELD GLASS


    1. Replace the windshield glass Click here.


    NEXT

  11. PERFORM PRE-CRASH SAFETY CITY SENSOR BEAM AXIS LEARNING


    1. Perform the "Recognition Camera/Target Position Memory" and "Beam Axis Learning" of pre-crash safety city sensor.

      Perform adjustment with either "ONE TIME RECOGNITION" or "SEQUENTIAL RECOGNITION".



    NEXT

  12. CHECK FOR DTCs


    1. Clear the DTCs Click here.

    2. Make sure that the DTC detection conditions are met.

      Tech Tips

      If the detection conditions are not met, the system cannot detect the malfunction.

    3. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC C1AA8 and C1AA9 are not output A
      DTC C1AA8 or C1AA9 is output B

    A

    END

    B

    REPLACE PRE-CRASH SAFETY CITY SENSOR Click here

  13. PERFORM PRE-CRASH SAFETY CITY SENSOR BEAM AXIS LEARNING


    1. Return the vehicle to its normal condition.

    2. Perform the "Recognition Camera/Target Position Memory" and "Beam Axis Learning" of pre-crash safety city sensor.

      Perform adjustment with either "ONE TIME RECOGNITION" or "SEQUENTIAL RECOGNITION".



    NEXT

    END