DYNAMIC RADAR CRUISE CONTROL SYSTEM, Diagnostic DTC:C1A4A

DTC Code DTC Name
C1A4A Skid Control Buzzer Circuit

DESCRIPTION

A buzzer sounds to alert the driver when the vehicle-to-vehicle distance becomes less than the set value.

DTC No. DTC Detection Condition Trouble Area
C1A4A While power switch is on (IG), skid control buzzer circuit malfunction signal is received by brake booster with master cylinder (skid control ECU) for 1 second or more while the dynamic radar cruise control is operating

  • Electronically controlled brake system

  • Driving support ECU assembly

WIRING DIAGRAM

A005EQDE08

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS (SKID CONTROL BUZZER)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Chassis / ABS/VSC/TRAC / Active Test / DSS Signal Buzzer.

    5. Perform the Active Test.

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

    NG

    GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM Click here

    OK

  2. CHECK FOR DTCs (DTC C1A4A)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Clear the DTCs Click here.

    4. Perform the following to make sure that the DTC detection conditions are met.

      Tech Tips

      If the detection conditions are not met, the malfunction cannot be detected.


      1. Drive the vehicle at a speed of between approximately 50 km/h (30 mph) and 170 km/h (105 mph).

      2. Turn the cruise control switch (ON-OFF button).

      3. Push the cruise control switch to -/SET to begin control of vehicle speed using the cruise control system.

    5. Enter the following menus: Powertrain / Radar Cruise / Trouble Codes.

    6. Check for DTCs.

      Result
      Result Proceed to
      DTC is not output A
      DTC C1A4A is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

  3. REPLACE DRIVING SUPPORT ECU ASSEMBLY


    1. Replace the driving support ECU assembly Click here.


    NEXT

  4. CHECK FOR DTCs (DTC C1A4A)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Clear the DTCs Click here.

    4. Perform the following to make sure that the DTC detection conditions are met.

      Tech Tips

      If the detection conditions are not met, the malfunction cannot be detected.


      1. Drive the vehicle at a speed of between approximately 50 km/h (30 mph) and 170 km/h (105 mph).

      2. Turn the cruise control system on using the cruise control switch (ON-OFF button).

      3. Push the cruise control switch to -/SET to begin control of vehicle speed using the cruise control system.

    5. Enter the following menus: Powertrain / Radar Cruise / Trouble Codes.

    6. Check for DTCs.

      Result
      Result Proceed to
      DTC is not output A
      DTC C1A4A is output B

    A

    END

    B

  5. REPLACE BRAKE BOOSTER WITH MASTER CYLINDER


    1. Replace the brake booster with master cylinder (skid control ECU) (for LHD) Click here.

    2. Replace the brake booster with master cylinder (skid control ECU) (for RHD) Click here.


    NEXT

  6. CHECK FOR DTCs (DTC C1A4A)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Clear the DTCs Click here.

    4. Perform the following to make sure that the DTC detection conditions are met.

      Tech Tips

      If the detection conditions are not met, the malfunction cannot be detected.


      1. Drive the vehicle at a speed of between approximately 50 km/h (30 mph) and 170 km/h (105 mph).

      2. Turn the cruise control system on using the cruise control switch (ON-OFF button).

      3. Push the cruise control switch to -/SET to begin control of vehicle speed using the cruise control system.

    5. Enter the following menus: Powertrain / Radar Cruise / Trouble Codes.

    6. Check for DTCs.

      Result
      Result Proceed to
      DTC is not output A
      DTC C1A4A is output B

    A

    END

    B

    REPLACE POWER MANAGEMENT CONTROL ECU Click here