DYNAMIC RADAR CRUISE CONTROL SYSTEM, Diagnostic DTC:C1A4A

DTC Code DTC Name
C1A4A Skid Control Buzzer Circuit

DESCRIPTION

The driving support ECU assembly does this by sending a request signal to the millimeter wave radar sensor assembly to sound the skid control buzzer.

When the millimeter wave radar sensor assembly detects a malfunction in the skid control buzzer circuit, a malfunction signal is sent to the driving support ECU assembly, and this DTC is stored.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1A4A Skid Control Buzzer Circuit While the engine switch is on (IG), a skid control buzzer circuit malfunction signal is received from the millimeter wave radar sensor assembly for 3 seconds or more.

  • Skid control buzzer

  • Millimeter wave radar sensor assembly

  • Driving support ECU assembly

  • Harness or connector

WIRING DIAGRAM

B005AGAE06

CAUTION / NOTICE / HINT

Note


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

  • When replacing the driving support ECU assembly, 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 driving support ECU assembly will not match the information from the vehicle, and as a result, a DTC may be stored.

  • When the millimeter wave radar sensor assembly is replaced with a new one, adjustment of the radar sensor beam axis must be performed.

    Click here

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs.

      Click here


      Powertrain > Radar Cruise > 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.

    3. Check for DTCs.

      Click here


      Powertrain > Radar Cruise > Trouble Codes
      Result
      Result Proceed to
      DTC C1A4A is not output A
      DTC C1A4A is output B
      DTC C1A4A and U0235 are output C
      DTC C1A4A and U1104 are output D

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    GO TO DTC U0235 Click here

    D

    GO TO DTC U1104 Click here

    B

  2. PERFORM ACTIVE TEST USING GTS (RADAR CRUISE APPROACH ALARM BUZZER)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Pre-Crash 2 / Active Test.

    5. Perform "Active Test" according to the display on GTS.


      Body Electrical > Pre-Crash 2 > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Radar Cruise Approach Alarm Buzzer Skid control buzzer ON or OFF Buzzer can be heard

      Body Electrical > Pre-Crash 2 > Active Test
      Tester Display
      Radar Cruise Approach Alarm Buzzer
      OK
      Skid control buzzer sounds.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here

    NG

  3. INSPECT SKID CONTROL BUZZER


    1. Remove the skid control buzzer.

      Click here

    2. Inspect the skid control buzzer.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SKID CONTROL BUZZER Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (SKID CONTROL BUZZER - BATTERY)


    1. B005AV9C24
      *a

      Front view of wire harness connector

      (to Skid Control Buzzer)

      Disconnect the skid control buzzer connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      I36-2 (IG1) - Body ground Engine switch on (IG) 11 to 14 V
      I36-2 (IG1) - Body ground Engine switch off Below 1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (SKID CONTROL BUZZER - MILLIMETER WAVE RADAR SENSOR ASSEMBLY)


    1. Disconnect the I36 skid control buzzer connector.

    2. Disconnect the A21 millimeter wave radar sensor assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I36-1 (BZ) - A21-10 (BZ) Always Below 1 Ω
      I36-1 (BZ) or A21-10 (BZ) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY


    1. Replace the millimeter wave radar sensor assembly with a new one.

      Click here

    2. Perform millimeter wave radar sensor assembly adjustment.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  7. CHECK FOR DTC


    1. Clear the DTCs.

      Click here


      Powertrain > Radar Cruise > 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.

    3. Check for DTCs.

      Click here


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

    A

    END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE)

    B

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here