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PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:C1A4A

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DTC Code DTC Name
C1A4A Skid Control Buzzer Circuit
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DESCRIPTION

Based on pre-crash control, the driving support ECU communicates 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 detects a malfunction in the VSC warning buzzer circuit, a malfunction signal is sent to the driving support ECU, and a DTC is stored. Although the skid control ECU sends a malfunction signal to the driving support ECU, the vehicle stability control system does not stored a relevant malfunction detection DTC.

DTC No. DTC Detection Condition Trouble Area
C1A4A When the engine switch is on (IG), a skid control buzzer circuit malfunction signal is received from the skid control ECU.

  • Skid control buzzer

  • Skid control buzzer circuit

  • Skid control ECU

  • Driving support ECU
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INSPECTION PROCEDURE

Tip:

This circuit uses CAN communication. Therefore, be sure to check that the CAN communication system is normal before performing inspection (Click here).

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PROCEDURE


  1. Click here

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER (SKID CONTROL BUZZER)


    1. Select the Active Test, use the intelligent tester to generate a control command, then check that the skid control buzzer sounds (Click here).

      Table 1. Chassis/ABS/VSC/TRC
      Tester Display Test Part Control Range Diagnostic Note
      Buzzer Skid control buzzer sounds ON/OFF -
      OK
      Skid control buzzer sounds.

  2. Click here

    REPLACE BRAKE ACTUATOR (SKID CONTROL ECU)


    1. Replace the brake actuator (Click here).


  3. Click here

    CHECK DTC OUTPUT (PRE-CRASH SAFETY SYSTEM)


    1. Using the intelligent tester, enter the following menus: Body / Pre-Crash 2 / DTC.

    2. Clear the DTCs (Click here).

    3. Recheck for DTCs.

      OK
      DTC C1A4A is not output.

  4. Click here

    GO TO VEHICLE STABILITY CONTROL SYSTEMClick here

  5. Click here

    REPLACE DRIVING SUPPORT ECUClick here

  6. Click here

    END (SKID CONTROL ECU WAS DEFECTIVE)