DYNAMIC RADAR CRUISE CONTROL SYSTEM, Diagnostic DTC:C1A4A

DTC Code DTC Name
C1A4A Skid Control Buzzer Circuit

DESCRIPTION

Based on dynamic radar cruise control system operation, the driving support ECU assembly provides warnings to the driver by sounding the pre-collision city buzzer.

DTC C1A4A is stored when a malfunction is detected in the pre-collision city buzzer circuit.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1A4A Skid Control Buzzer Circuit

w/o Full-speed range following function:


  • While the vehicle speed is 36 km/h (22 mph) or more and the dynamic radar cruise control system is operating, the driving support ECU assembly detects a malfunction in the pre-collision city buzzer circuit for approximately 0.4 seconds or more.

w/ Full-speed Range Following Function:


  • While the vehicle speed is 5 km/h (3 mph) or more and the dynamic radar cruise control system is operating, the driving support ECU assembly detects a malfunction in the pre-collision city buzzer circuit for approximately 0.4 seconds or more.

  • Pre-collision city buzzer

  • Driving support ECU assembly

  • Harness or connector

WIRING DIAGRAM

B000XOHE30
*a from IG Circuit
*b IG1 D NO.2
*c Pre-collision City Buzzer
*d Driving Support ECU Assembly

CAUTION / NOTICE / HINT

Note


  • Inspect the fuses for circuits related to this system before performing the following procedure.

  • When replacing the driving support ECU assembly, make sure to replace it with a new one. If a device which was installed to another vehicle is used, the information stored in the driving support ECU assembly will not match the information from the vehicle, and as a result, a DTC may be stored.

PROCEDURE


  1. CHECK FOR DTCs (PRE-COLLISION SYSTEM)


    1. Check for DTCs of the pre-collision system.

      Click here


      Body Electrical > Pre-Collision 2 > Trouble Codes

      Tech Tips


      • w/o Full-speed range following function:

        The dynamic radar cruise control system only stores DTC C1A4A when the vehicle speed reaches 36 km/h (22 mph), however the pre-collision system stores this DTC at any vehicle speed. If DTC C1A4A is stored by the pre-collision system, perform troubleshooting of the pre-collision system first.

      • w/ Full-speed range following function:

        The dynamic radar cruise control system only stores DTC C1A4A when the vehicle speed reaches 5 km/h (3 mph), however the pre-collision system stores this DTC at any vehicle speed. If DTC C1A4A is stored by the pre-collision system, perform troubleshooting of the pre-collision system first.

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

    B

    GO TO PRE-COLLISION SYSTEM Click here

    A

  2. CHECK FOR DTCs (RADAR CRUISE 2)


    1. Clear the DTCs.

      Click here


      Powertrain > Radar Cruise2 > Clear DTCs

    2. Make sure that the DTC detection conditions are met.

      Tech Tips

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

    3. Check for DTCs.

      Click here


      Powertrain > Radar Cruise2 > Trouble Codes
      Result
      Result Proceed to
      DTC C1A4A is not output A
      DTC C1A4A is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

  3. INSPECT PRE-COLLISION CITY BUZZER (CONFIRM BUZZER OPERATION)


    1. Turn the engine switch on (IG).

    2. Check that the pre-collision city buzzer is sounds.

      Result
      Result Proceed to
      The pre-collision city buzzer does not sound when the engine switch is on (IG). A
      The pre-collision city buzzer sounds continuously when the engine switch is on (IG). B

    B

    CHECK HARNESS AND CONNECTOR (PRE-COLLISION CITY BUZZER - DRIVING SUPPORT ECU ASSEMBLY) Click here

    A

  4. CHECK HARNESS AND CONNECTOR (PRE-COLLISION CITY BUZZER - BATTERY)


    1. B000XEGC07
      *a

      Front view of wire harness connector

      (to Pre-collision City Buzzer)

      Disconnect the P61 pre-collision city buzzer connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      P61-2 (IG1) - Body ground Engine switch on (IG) 11 to 14 V
      P61-2 (IG1) - Body ground Engine switch off Below 1 V

    3. Connect the P61 pre-collision city buzzer connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (PRE-COLLISION CITY BUZZER - BATTERY)

    OK

  5. CHECK HARNESS AND CONNECTOR (PRE-COLLISION CITY BUZZER - DRIVING SUPPORT ECU ASSEMBLY)


    1. Disconnect the P61 pre-collision city buzzer connector.

    2. Disconnect the P62 driving support ECU assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      P61-1 (BZ) - P62-3 (BZ) Always Below 1 Ω
      P61-1 (BZ) or P62-3 (BZ) - Body ground Always 10 kΩ or higher

    4. Connect the P62 driving support ECU assembly connector.

    5. Connect the P61 pre-collision city buzzer connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (PRE-COLLISION CITY BUZZER - DRIVING SUPPORT ECU ASSEMBLY)

    OK

  6. INSPECT PRE-COLLISION CITY BUZZER


    1. Remove the pre-collision city buzzer.

      Click here

    2. Inspect the pre-collision city buzzer.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here

    NG

    REPLACE PRE-COLLISION CITY BUZZER Click here

  7. CHECK HARNESS AND CONNECTOR (PRE-COLLISION CITY BUZZER - DRIVING SUPPORT ECU ASSEMBLY)


    1. Disconnect the P61 pre-collision city buzzer connector.

    2. Disconnect the P62 driving support ECU assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      P61-1 (BZ) - P62-3 (BZ) Always Below 1 Ω
      P61-1 (BZ) or P62-3 (BZ) - Body ground Always 10 kΩ or higher

    4. Connect the P62 driving support ECU assembly connector.

    5. Connect the P61 pre-collision city buzzer connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (PRE-COLLISION CITY BUZZER - DRIVING SUPPORT ECU ASSEMBLY)