LANE-KEEPING ASSIST SYSTEM, Diagnostic DTC:C1A4A

DTC Code DTC Name
C1A4A Skid Control Buzzer Circuit

DESCRIPTION

When the skid control ECU detects a malfunction in the skid control buzzer circuit, a malfunction signal is sent to the driving support ECU and a DTC is stored.

DTC Code DTC Detection Condition Trouble Area
C1A4A While the power switch is ON (IG), a skid control buzzer circuit malfunction signal is received from the skid control ECU for 1 second.

  • Skid control buzzer circuit

  • Skid control ECU

  • Driving support ECU

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (SKID CONTROL BUZZER)


    1. Select the item below in the Active Test, and then check that the skid control buzzer sounds Click here.

      ABS/VSC/TRC
      Tester Display Test Part Control Range Diagnosis Note
      Buzzer Skid control buzzer sounds ON/OFF -
      OK
      Skid control buzzer sounds.

    NG

    GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM Click here

    OK

  2. REPLACE SKID CONTROL ECU


    1. for LHD:

      Replace the skid control ECU Click here.

    2. for RHD:

      Replace the skid control ECU Click here.


    NEXT

  3. CHECK FOR DTC


    1. Clear the DTCs Click here.

      Tech Tips

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


      1. Drive the vehicle at a 50 km/h (31 mph) or more, and operate lane-keeping assist system.

    2. Check for DTCs Click here.

      OK
      DTC C1A4A is not output.

    OK

    END (SKID CONTROL ECU IS DEFECTIVE)

    NG

    REPLACE DRIVING SUPPORT ECU Click here