DYNAMIC RADAR CRUISE CONTROL SYSTEM, Diagnostic DTC:C1A4A

DTC Code DTC Name
C1A4A Skid Control Buzzer Circuit

DESCRIPTION

Based on dynamic radar cruise control system operation, the forward recognition camera provides warnings to the driver by sounding the pre-collision city buzzer.

DTC C1A4A is stored when a malfunction is detected in the pre-collision city buzzer circuit.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1A4A Skid Control Buzzer Circuit While the vehicle speed is 5 km/h (3 mph) or more and the dynamic radar cruise control system is operating, the forward recognition camera detects a malfunction in the pre-collision city buzzer circuit for approximately 0.4 seconds or more.

  • Pre-collision city buzzer

  • Millimeter wave radar sensor assembly

  • Forward recognition camera

  • Harness or connector

WIRING DIAGRAM

A005N7IE01

CAUTION / NOTICE / HINT

Note


  • Inspect the fuses for circuits related to this system before performing the following procedure.

  • When replacing the forward recognition camera, make sure to replace it with a new one. If a device which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle, and as a result, a DTC may be stored.

  • First check the CAN communication system by following How to Proceed with Troubleshooting. After checking that there are no malfunctions in the CAN communication system, proceed with troubleshooting.

    Click here

PROCEDURE


  1. CHECK FOR DTCs (PRE-COLLISION SYSTEM)


    1. Check for DTCs of the pre-collision system.

      Click here


      Body Electrical > Pre-Collision 2 > Trouble Codes

      Tech Tips

      The dynamic radar cruise control system only stores DTC C1A4A when the vehicle speed reaches 5 km/h (3 mph), however the pre-collision system stores this DTC at any vehicle speed. If DTC C1A4A is stored by the pre-collision system, perform troubleshooting of the pre-collision system first.

      Result
      Result Proceed to
      DTC C1A4A is not output A
      DTC C1A4A is output B

    B

    GO TO PRE-COLLISION SYSTEM Click here

    A

  2. CHECK FOR DTCs (RADAR CRUISE 2)


    1. Clear the DTCs.

      Click here


      Powertrain > Radar Cruise2 > Clear DTCs

    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.


      1. Turn the power switch on (IG).

      2. Turn the dynamic radar cruise control system on using the cruise control main switch (ON/OFF button).

      3. Drive the vehicle at 5 km/h (3 mph) or more for 1 second or more.

    3. Perform the Active Test according to the display on the GTS.

      Click here

      Note

      Perform the Active Test for 1 second or more.

      Tech Tips

      Performing the Active Test for 1 second or more causes DTC C1A4A to be stored if the DTC detection conditions are met.


      Powertrain > Radar Cruise2 > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Radar Cruise Stop Buzzer Skid control buzzer (stop sound) ON or OFF Buzzer can be heard
      Radar Cruise Approach Alarm Buzzer Skid control buzzer (approach sound) ON or OFF Buzzer can be heard

      Powertrain > Radar Cruise2 > Active Test
      Tester Display
      Radar Cruise Stop Buzzer
      Radar Cruise Approach Alarm Buzzer

    4. Check for DTCs.

      Click here


      Powertrain > Radar Cruise2 > Trouble Codes
      Result
      Result Proceed to
      DTC C1A4A is not output A
      DTC C1A4A is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

  3. INSPECT TERMINAL VOLTAGE


    1. A005MYIC10
      *a

      Front view of wire harness connector

      (to pre-collision city buzzer)

      Disconnect the F54 pre-collision city buzzer connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      F54-2 (IG1) - Body ground Power switch on (IG) 11 to 14 V
      Power switch off Below 1 V

    3. Connect the F54 pre-collision city buzzer connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (PRE-COLLISION CITY BUZZER - AUXILIARY BATTERY)

    OK

  4. CHECK HARNESS AND CONNECTOR (PRE-COLLISION CITY BUZZER - FORWARD RECOGNITION CAMERA)


    1. Disconnect the F54 pre-collision city buzzer connector.

    2. Disconnect the R5 forward recognition camera connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      F54-1 (BZ) - R5-8 (BZ) Always Below 1 Ω
      F54-1 (BZ) or R5-8 (BZ) - Body ground Always 10 kΩ or higher

    4. Connect the R5 forward recognition camera connector.

    5. Connect the F54 pre-collision city buzzer connector.

      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 7 Click here

    NG

  5. REPAIR OR REPLACE HARNESS OR CONNECTOR (PRE-COLLISION CITY BUZZER - FORWARD RECOGNITION CAMERA)


    1. Repair or replace the harness or connector.

      Result
      Proceed to
      NEXT

    NEXT

  6. CHECK FOR DTCs (RADAR CRUISE 2)


    1. Clear the DTCs.

      Click here


      Powertrain > Radar Cruise2 > Clear DTCs

    2. Perform the Active Test according to the display on the GTS.

      Click here

      Note

      Perform the Active Test for 1 second or more.

      Tech Tips

      Performing the Active Test for 1 second or more causes DTC C1A4A to be stored if the DTC detection conditions are met.


      Powertrain > Radar Cruise2 > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Radar Cruise Stop Buzzer Skid control buzzer (stop sound) ON or OFF Buzzer can be heard
      Radar Cruise Approach Alarm Buzzer Skid control buzzer (approach sound) ON or OFF Buzzer can be heard

    3. Check for DTCs.

      Click here


      Powertrain > Radar Cruise2 > Trouble Codes
      Result
      Result Proceed to
      DTC C1A4A is not output A
      DTC C1A4A is output B

    A

    END

    B

  7. INSPECT PRE-COLLISION CITY BUZZER (CONFIRM BUZZER OPERATION)


    1. Turn the power switch on (IG).

    2. Check if the pre-collision city buzzer is sounding.

      Result
      Result Proceed to
      The pre-collision city buzzer does not sound when the power switch on (IG) A
      The pre-collision city buzzer sounds continuously when the power switch on (IG) B

    B

    GO TO STEP 9 Click here

    A

  8. INSPECT PRE-COLLISION CITY BUZZER (UNIT INSPECTION)


    1. Remove the pre-collision city buzzer.

      Click here

    2. Inspect the pre-collision city buzzer.

      Click here

      Result
      Result Proceed to
      Pre-collision city buzzer is abnormal A
      Pre-collision city buzzer is normal B

    B

    GO TO STEP 10 Click here

    A

  9. REPLACE PRE-COLLISION CITY BUZZER


    1. Replace the pre-collision city buzzer.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  10. CHECK FOR DTCs (RADAR CRUISE 2)


    1. Clear the DTCs.

      Click here


      Powertrain > Radar Cruise2 > Trouble Codes

    2. Perform the Active Test according to the display on the GTS.

      Click here

      Note

      Perform the Active Test for 1 second or more.

      Tech Tips

      Performing the Active Test for 1 second or more causes DTC C1A4A to be stored if the DTC detection conditions are met.


      Powertrain > Radar Cruise2 > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Radar Cruise Stop Buzzer Skid control buzzer (stop sound) ON or OFF Buzzer can be heard
      Radar Cruise Approach Alarm Buzzer Skid control buzzer (approach sound) ON or OFF Buzzer can be heard

    3. Check for DTCs.

      Click here


      Powertrain > Radar Cruise2 > Trouble Codes
      Result
      Result Proceed to
      DTC C1A4A is not output A
      DTC C1A4A is output B

    A

    END

    B

  11. REPLACE FORWARD RECOGNITION CAMERA


    1. Replace the forward recognition camera.

      Click here

    2. Perform Forward Recognition Axis Adjustment.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  12. CHECK FOR DTCs (RADAR CRUISE 2)


    1. Clear the DTCs.

      Click here


      Powertrain > Radar Cruise2 > Clear DTCs

    2. Perform the Active Test according to the display on the GTS.

      Click here

      Note

      Perform the Active Test for 1 second or more.

      Tech Tips

      Performing the Active Test for 1 second or more causes DTC C1A4A to be stored if the DTC detection conditions are met.


      Powertrain > Radar Cruise2 > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Radar Cruise Stop Buzzer Skid control buzzer (stop sound) ON or OFF Buzzer can be heard
      Radar Cruise Approach Alarm Buzzer Skid control buzzer (approach sound) ON or OFF Buzzer can be heard

    3. Check for DTCs.

      Click here


      Powertrain > Radar Cruise2 > Trouble Codes
      Result
      Result Proceed to
      DTC C1A4A is not output A
      DTC C1A4A is output B

    A

    END (FORWARD RECOGNITION CAMERA WAS DEFECTIVE)

    B

  13. REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY


    1. Replace the millimeter wave radar sensor assembly.

      Click here

    2. Adjust the millimeter wave radar sensor assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  14. CLEAR DTC (RADAR CRUISE 2)


    1. Clear the DTCs.

      Click here


      Powertrain > Radar Cruise2 > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

    END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE)