PRE-COLLISION SYSTEM, Diagnostic DTC:C1AA8 and 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 optical axis of the pre-collision city sensor has deviated, DTC C1AA8 is output. DTC C1AA9 is output when the system determines that pre-collision city sensor optical axis learning has not been performed or has not been completed normally after a new pre-collision city sensor is installed.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1AA8

Front Camera Module Incorrect Axial Gap

When the system is operating, a misaligned axis of the pre-collision city sensor is detected.

  • Pre-collision city sensor

  • Windshield glass

C1AA9

Front Camera Module Beam Axis Not Adjusted

When the system is operating, an unadjusted axis of the pre-collision city sensor is detected.

  • Pre-collision city sensor

  • Windshield glass

CAUTION / NOTICE / HINT

Note:

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

  • If the pre-collision city sensor has been replaced, or the windshield glass has been replaced or removed/installed, be sure to perform Pre-collision City Sensor Optical Axis Learning.

    Tip:

    Pre-collision City Sensor Optical Axis Learning can be performed by using either One Time Recognition or Sequential Recognition.

    One Time Recognition:Click here

    Sequential Recognition:Click here

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

PROCEDURE

  1. CHECK FOR DTCS

    1. Check if the stored DTCs are current DTCs.

    2. Check for DTCs.

      Click here

      Chassis > PCS/LDA/RSA/LVN > Trouble Codes

    Result

    Result

    Proceed to

    Current DTC C1AA8 is output

    A

    Current DTC C1AA9 is output

    B

    History DTC C1AA8 is output

    C
    B

    PERFORM PRE-COLLISION CITY SENSOR OPTICAL AXIS LEARNINGClick here

    C

    CLEAR DTCsClick here

    A

  2. CHECK VEHICLE OPERATING CONDITION

    1. Check the operating conditions of the vehicle.

    Result

    Result

    Proceed to

    Vehicle is overloaded or being towed.

    A

    Vehicle is not overloaded or being towed.

    B
    B

    CHECK WHEEL ALIGNMENTClick here

    A

  3. PERFORM PRE-COLLISION CITY SENSOR OPTICAL AXIS LEARNING

    1. Return the vehicle to normal operating conditions.

    2. Perform Pre-collision City Sensor Optical Axis Learning.

      Tip:

      Pre-collision City Sensor Optical Axis Learning can be performed by using either One Time Recognition or Sequential Recognition.

      One Time Recognition:Click here

      Sequential Recognition:Click here

    Result

    Proceed to

    NEXT
    NEXT

    END

  4. CHECK WHEEL ALIGNMENT

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

      for front wheel alignment:Click here

      for rear wheel alignment:Click here

      Result

      Result

      Proceed to

      Front or rear wheel is misaligned (toe)

      A

      Front and rear wheels are not misaligned (toe)

      B
    B

    CHECK PRE-COLLISION CITY SENSOR INSTALLATIONClick here

    A

  5. ADJUST WHEEL ALIGNMENT

    1. Adjust the alignment (toe) of the wheels.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  6. PERFORM PRE-COLLISION CITY SENSOR OPTICAL AXIS LEARNING

    1. Perform Pre-collision City Sensor Optical Axis Learning.

      Tip:

      Pre-collision City Sensor Optical Axis Learning can be performed by using either One Time Recognition or Sequential Recognition.

      One Time Recognition:Click here

      Sequential Recognition:Click here

    Result

    Proceed to

    NEXT
    NEXT

    END

  7. CHECK PRE-COLLISION CITY SENSOR INSTALLATION

    1. Check the installation condition of the pre-collision city sensor.

      Click here

      Tip:

      If there is a malfunction with the installation condition of the pre-collision city sensor, replace the windshield glass.

      Click here

    Result

    Result

    Proceed to

    No deformation or deviation in pre-collision city sensor installation bracket

    A

    Deformation or deviation in pre-collision city sensor installation bracket

    B
    B

    REPLACE WINDSHIELD GLASSClick here

    A

  8. PERFORM PRE-COLLISION CITY SENSOR OPTICAL AXIS LEARNING

    1. Perform Pre-collision City Sensor Optical Axis Learning.

      Tip:

      Pre-collision City Sensor Optical Axis Learning can be performed by using either One Time Recognition or Sequential Recognition.

      One Time Recognition:Click here

      Sequential Recognition:Click here

    Result

    Proceed to

    NEXT
    NEXT

  9. CHECK FOR DTCS

    1. Clear the DTCs.

      Click here

      Chassis > PCS/LDA/RSA/LVN > Clear DTCs

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

      Tip:

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

    3. Check for DTCs.

      Click here

      Chassis > PCS/LDA/RSA/LVN > Trouble Codes

    Result

    Result

    Proceed to

    DTC C1AA8 and C1AA9 are not output

    A

    DTC C1AA8 or C1AA9 is output

    B
    A

    END

    B

    REPLACE PRE-COLLISION CITY SENSOR

    Click here

  10. CLEAR DTCs

    1. Check for DTCs related to misalignment of the pre-collision city sensor.

      Tip:

      If only history DTCs are stored, they may have stored due to a temporarily condition such as overloading of the vehicle, and the system returned to normal when optical axis learning was performed.

    2. Clear the DTCs.

      Click here

      Chassis > PCS/LDA/RSA/LVN > Clear DTCs

    Result

    Proceed to

    NEXT
    NEXT

    END

  11. REPLACE WINDSHIELD GLASS

    1. Replace the windshield glass.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

    PERFORM PRE-COLLISION CITY SENSOR OPTICAL AXIS LEARNINGClick here