PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:C1A4A

DTC Code DTC Name
C1A4A Skid Control Buzzer Circuit

DESCRIPTION

Based on pre-crash safety control, the driving support ECU informs to the driver to be careful. The driving support ECU performs this by sending a sounding signal to the skid control ECU to sound the skid control buzzer.

When the skid control ECU assembly detects a malfunction in the skid control buzzer circuit, a malfunction signal is sent to the driving support ECU, and a DTC is output. Although the skid control ECU assembly sends a malfunction signal to the driving support ECU, the ABS does not output a relevant malfunction detection DTC.

DTC Code DTC Detection Condition Trouble Area
C1A4A While power switch is on (IG), skid control buzzer circuit malfunction signal is received by skid control ECU assembly for 3 seconds while the vehicle is being driven at a speed of 50 km/h (31 mph) or more.

  • Skid control buzzer

  • Skid control buzzer circuit

  • Skid control ECU assembly

  • Driving support ECU

INSPECTION PROCEDURE

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS (DSS SIGNAL BUZZER)


    1. Select the Active Test on the GTS Click here.

      ABS/VSC/TRC
      Tester Display Test Part Control Range Diagnostic Note
      Buzzer Skid control buzzer ON/OFF The buzzer can be heard.
      OK
      Skid control buzzer sounds.

    NG

    GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM Click here

    OK

  2. REPLACE SKID CONTROL ECU ASSEMBLY


    1. Replace the skid control ECU assembly with a new one Click here.


    NEXT

  3. CHECK FOR DTC (PRE-CRASH SAFETY SYSTEM)


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC C1A4A is not output.

      Note

      When replacing the driving support ECU, always replace it with a new one and be sure to perform initialization Click here. If an ECU which was installed to another vehicle is used, the information stored in the ECU will not match the information from the vehicle, and as a result, a DTC may be stored.


    NG

    REPLACE DRIVING SUPPORT ECU Click here

    OK

    END (SKID CONTROL ECU ASSEMBLY WAS DEFECTIVE)