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 brake actuator assembly (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 output. Although the brake actuator assembly (skid control ECU) 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 engine switch is on (IG), skid control buzzer circuit malfunction signal is received by brake actuator 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

  • Brake actuator assembly (skid control ECU)

  • Driving support ECU

INSPECTION PROCEDURE

PROCEDURE


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


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

    5. Enter the following menus: Chassis / ABS/VSC/TRAC / Active Test Click here.

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

    NG

    GO TO VEHICLE STABILITY CONTROL SYSTEM Click here

    OK

  2. REPLACE BRAKE ACTUATOR ASSEMBLY


    1. Replace the brake actuator 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 (BRAKE ACTUATOR ASSEMBLY WAS DEFECTIVE)