PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:C1A4A

DTC Code DTC Name
C1A4A Skid Control Buzzer Circuit

DESCRIPTION

The driving support ECU assembly operates the pre-crash alarm control by sending a buzzer request signal to the pre-crash safety city buzzer.

If the driving support ECU assembly detects a malfunction in the pre-crash safety city buzzer circuit, it stores DTC C1A4A.

DTC No. DTC Detection Condition Trouble Area
C1A4A

When the engine switch is on (IG) and the pre-crash alarm control is operating, either of the following conditions is met:


  • A buzzer request signal is sent to the pre-crash safety city buzzer but the buzzer does not sound for 1 second or more.

  • A buzzer request signal is not sent to the pre-crash safety city buzzer but the buzzer sounds for 1 second or more.

  • Pre-crash safety city buzzer

  • Driving support ECU assembly

  • Harness or connector

WIRING DIAGRAM

B001YSFE82
*a from IG1 NO.4 Relay
*b ECU-IG NO. 6
*c Pre-crash Safety 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, always replace it with a new one. If a driving support ECU assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.

PROCEDURE


  1. CHECK DTC OUTPUT (PRE-CRASH SAFETY SYSTEM)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Pre-Crash 2 / Trouble Codes.

    5. Clear the DTCs Click here.

    6. Enter the following menus: Body Electrical / Pre-Crash 2 / Active Test.

    7. Perform the Active Test according to the display on the GTS.

      Note

      Perform the Active Test for 1 second or more.

      Tech Tips

      This DTC can be stored by performing the Active Test.

      Pre-Crash 2
      Tester Display Test Part Control Range Diagnostic Note
      PCS Crash Alarm Buzzer Pre-crash safety city buzzer ON/OFF Test possible with engine switch on (IG), vehicle stopped

    8. Check for DTCs Click here.

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

    B

    USE SIMULATION METHOD TO CHECK (SYMPTOM SIMULATION) Click here

    A

  2. CHECK TERMINAL VOLTAGE


    1. B001X11E02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Pre-crash Safety City Buzzer)

      Disconnect the pre-crash safety city buzzer connector.

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

      Standard Voltage :
      Tester Connection Condition Specified Condition
      E5-2 (IG1) - Body ground Engine switch on (IG) 11 to 14 V
      E5-2 (IG1) - Body ground Engine switch off Below 1 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (PRE-CRASH SAFETY CITY BUZZER - DRIVING SUPPORT ECU ASSEMBLY)


    1. Disconnect the pre-crash safety city buzzer connector.

    2. Disconnect the 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
      E5-1 (BZ) - E164-3 (BZ) Always Below 1 Ω
      E5-1 (BZ) orE164-3 (BZ) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      NG A
      OK B

    B

    INSPECT PRE-CRASH SAFETY CITY BUZZER (CONFIRM BUZZER OPERATION) Click here

    A

  4. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


    NEXT

  5. CHECK DTC OUTPUT (PRE-CRASH SAFETY SYSTEM)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Pre-Crash 2 / Trouble Codes.

    5. Clear the DTCs Click here.

    6. Enter the following menus: Body Electrical / Pre-Crash 2 / Active Test.

    7. Perform "Active Test" according to the display on the GTS.

      Note

      Perform the Active Test for 1 second or more.

      Tech Tips

      This DTC can be stored by performing the Active Test.

      Pre-Crash 2
      Tester Display Test Part Control Range Diagnostic Note
      PCS Crash Alarm Buzzer Pre-crash safety city buzzer ON/OFF Test possible with engine switch on (IG), vehicle stopped

    8. Check for DTCs Click here.

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

    B

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

  6. INSPECT PRE-CRASH SAFETY CITY BUZZER (CONFIRM BUZZER OPERATION)


    1. Turn the engine switch on (IG).

    2. Check if the pre-crash safety city buzzer is sounding.

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

    B

    REPLACE PRE-CRASH SAFETY CITY BUZZER Click here

    A

  7. INSPECT PRE-CRASH SAFETY CITY BUZZER (UNIT INSPECTION)


    1. Remove the pre-crash safety city buzzer Click here.

    2. Inspect the pre-crash safety city buzzer Click here.

      Result
      Result Proceed to
      Pre-crash safety city buzzer is abnormal. A
      Pre-crash safety city buzzer is normal. B

    B

    CHECK DTC OUTPUT (PRE-CRASH SAFETY SYSTEM) Click here

    A

  8. REPLACE PRE-CRASH SAFETY CITY BUZZER


    1. Replace the pre-crash safety city buzzer Click here.


    NEXT

  9. CHECK DTC OUTPUT (PRE-CRASH SAFETY SYSTEM)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Pre-Crash 2 / Trouble Codes.

    5. Clear the DTCs Click here.

    6. Enter the following menus: Body Electrical / Pre-Crash 2 / Active Test.

    7. Perform "Active Test" according to the display on the GTS.

      Note

      Perform the Active Test for 1 second or more.

      Tech Tips

      This DTC can be stored by performing the Active Test.

      Pre-Crash 2
      Tester Display Test Part Control Range Diagnostic Note
      PCS Crash Alarm Buzzer Pre-crash Safety City Buzzer ON/OFF Test possible with engine switch on (IG), vehicle stopped

    8. Check for DTCs Click here.

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

    A

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here

    B

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  10. CHECK DTC OUTPUT (PRE-CRASH SAFETY SYSTEM)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Pre-Crash 2 / Trouble Codes.

    5. Clear the DTCs Click here.

    6. Enter the following menus: Body Electrical / Pre-Crash 2 / Active Test.

    7. Perform "Active Test" according to the display on the GTS.

      Note

      Perform the Active Test for 1 second or more.

      Tech Tips

      This DTC can be stored by performing the Active Test.

      Pre-Crash 2
      Tester Display Test Part Control Range Diagnostic Note
      PCS Crash Alarm Buzzer Pre-crash Safety City Buzzer ON/OFF Test possible with engine switch on (IG), vehicle stopped

    8. Check for DTCs Click here.

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

    A

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here

    B

    USE SIMULATION METHOD TO CHECK Click here