ROAD SIGN ASSIST SYSTEM, Diagnostic DTC:C1AA2

DTC Code DTC Name
C1AA2 Vehicle Speed Tolerance Malfunction

DESCRIPTION

The forward recognition camera receives vehicle speed tolerance signals from the combination meter assembly. If the combination meter assembly detects a vehicle speed tolerance malfunction signal, it informs the forward recognition camera via CAN communication, and DTC C1AA2 is stored.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1AA2 Vehicle Speed Tolerance Malfunction 2 seconds after the power switch is turned on (IG), a signal from the combination meter assembly indicating an abnormal vehicle speed tolerance is detected by the forward recognition camera for 50 seconds or more.

  • Meter/gauge system

  • Combination meter assembly

  • Forward recognition camera

CAUTION / NOTICE / HINT

Note


  • When replacing the driving support ECU assembly, always replace it with a new one. If a driving support ECU assembly which was installed to another vehicle is used, the information stored in the driving support ECU assembly will not match the information from the vehicle. As a result, a DTC may be stored.

  • If the forward recognition camera has been replaced with a new one, be sure to perform forward recognition camera adjustment.

    Click here

  • The road sign assist system uses the CAN communication system. First, confirm that there are no malfunction in the CAN communication system. Refer to How to Proceed with Troubleshooting.

    Click here

PROCEDURE


  1. INSPECT COMBINATION METER ASSEMBLY (ON-VEHICLE INSPECTION)


    1. Perform On-vehicle Inspection of the meter/gauge system.

      Click here

      Tech Tips

      Check the meter function by referring to On-vehicle Inspection for the combination meter assembly.

      Result
      Result Proceed to
      Combination meter assembly is normal A
      Combination meter assembly is malfunctioning B

    B

    CHECK METER / GAUGE SYSTEM (SPEEDOMETER MALFUNCTION) Click here

    A

  2. CHECK FOR DTCs (ROAD SIGN ASSIST SYSTEM)


    1. Clear the DTCs.

      Click here


      Body Electrical > Road Sign Assist > Clear DTCs

    2. Perform the following procedure.

      Tech Tips

      If the following procedure is not performed, the previously output DTC cannot be detected.


      1. Turn the power switch on (IG) and wait 1 minute or more.

    3. Check for DTCs.

      Click here


      Body Electrical > Road Sign Assist > Trouble Codes
      Result
      Result Proceed to
      DTC C1AA2 is not output A
      DTC C1AA2 is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

  3. REPLACE FORWARD RECOGNITION CAMERA


    1. Replace the forward recognition camera.

      Click here

    2. Perform forward recognition camera adjustment.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  4. CHECK FOR DTCs (ROAD SIGN ASSIST SYSTEM)


    1. Clear the DTCs.

      Click here


      Body Electrical > Road Sign Assist > Clear DTCs

    2. Perform the following procedure.

      Tech Tips

      If the following procedure is not performed, the previously output DTC cannot be detected.


      1. Turn the power switch on (IG) and wait 1 minute or more.

    3. Check for DTCs.

      Click here


      Body Electrical > Road Sign Assist > Trouble Codes
      Result
      Result Proceed to
      DTC C1AA2 is not output A
      DTC C1AA2 is output B

    A

    END (FORWARD RECOGNITION CAMERA WAS DEFECTIVE)

    B

    REPLACE COMBINATION METER ASSEMBLY Click here