PRE-COLLISION SYSTEM, Diagnostic DTC:C1AA7

DTC Code DTC Name
C1AA7 Skid Control Buzzer Circuit

DESCRIPTION

When the pre-collision city sensor uses the pre-collision alarm control to sound a warning, a buzzer signal is output to the pre-collision city buzzer. This DTC is output when the pre-collision city sensor detects a malfunction in the pre-collision city buzzer circuit.

DTC No.

DTC Detection Condition

Trouble Area

C1AA7

  • The battery voltage is 9 V or more and either of the following conditions is met:

    • Voltage at the BUZ terminal of the pre-collision city sensor is 0.703 V or more for 0.06 seconds or more when a pre-collision city buzzer request signal is being output.

    • Voltage at the BUZ terminal of the pre-collision city sensor is 0.134 V or less for 0.06 seconds or more when a pre-collision city buzzer request signal is not being output.

  • Pre-collision city buzzer

  • Pre-collision city sensor

  • Harness or connector

WIRING DIAGRAM

B455832E01

CAUTION / NOTICE / HINT

Note:

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

  • When replacing the pre-collision city sensor, replace it with a new one and be sure to initialize the settings. If a pre-collision city sensor which was installed to another vehicle is used, the information stored in the pre-collision city sensor will not match the information from the vehicle and, as a result, a DTC may be stored.

  • If the pre-collision city sensor has been replaced, or the windshield glass has been replaced or removed/installed, be sure to perform Pre-collision City Sensor Learning (Click here).

PROCEDURE

  1. CHECK PRE-COLLISION CITY BUZZER SOUNDING CONDITION

    1. Check the operating condition of the pre-collision city buzzer.

    Table 1. Result

    Result

    Proceed to

    The pre-collision city buzzer is not sounding.

    A

    The pre-collision city buzzer is sounding.

    B

    CHECK HARNESS AND CONNECTOR (BUZZER - PRE-COLLISION CITY SENSOR)Click here

  2. PERFORM ACTIVE TEST USING GTS

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Chassis > PCS/LDA/RSA/LVN > Active Test.

    5. Perform the Active Test according to the display on the GTS (Click here).

      Table 2. Chassis > PCS/LDA/RSA/LVN > Active Test

      Tester Display

      Measurement Item

      Control Range

      Diagnostic Note

      PCS Buzzer Request

      Sound pre-collision city buzzer

      ON/OFF

      Test possible with ignition switch ON and vehicle stopped

    6. Check that the pre-collision city buzzer sounds when the Active Test "PCS Buzzer Request" is set to ON.

      OK

      The pre-collision city buzzer sounds.

    CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)Click here

  3. CHECK FOR DTCS

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Chassis / PCS/LDA/RSA/LVN / Trouble Codes.

    5. Clear the DTCs (Click here).

    6. Enter the following menus: Chassis > PCS/LDA/RSA/LVN > Active Test.

    7. Perform the Active Test according to the display on the GTS (Click here).

      Table 3. Chassis > PCS/LDA/RSA/LVN > Active Test

      Tester Display

      Measurement Item

      Control Range

      Diagnostic Note

      PCS Buzzer Request

      Sound pre-collision city buzzer

      ON/OFF

      Test possible with ignition switch ON and vehicle stopped

    8. Check for DTCs (Click here).

    Table 4. Result

    Result

    Proceed to

    DTC C1A47 is not output

    A

    DTC C1A47 is output

    B

    USE SIMULATION METHOD TO CHECK

    (Click here)

    REPLACE PRE-COLLISION CITY SENSOR

    (Click here)

  4. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

    1. U184665E02

      Disconnect the H133 pre-collision city buzzer connector.

      Table 5. Text in Illustration

      *a

      Front view of wire harness connector

      (to Pre-collision City Buzzer)

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      H133-2 (IG1) - Body ground

      Ignition switch ON

      11 to 14 V

      H133-2 (IG1) - Body ground

      Ignition switch off

      Below 1 V

    3. Connect the H133 pre-collision city buzzer connector.

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

  5. CHECK HARNESS AND CONNECTOR (BUZZER - PRE-COLLISION CITY SENSOR)

    1. Disconnect the H133 pre-collision city buzzer connector.

    2. Disconnect the Q12 pre-collision city sensor connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      H133-1 (BZ) - Q12-8 (BUZ)

      Always

      Below 1 Ω

      H133-1 (BZ) - Body ground

      Always

      10 kΩ or higher

    4. Connect the Q12 pre-collision city sensor connector.

    5. Connect the H133 pre-collision city buzzer connector.

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

  6. INSPECT PRE-COLLISION CITY BUZZER

    1. Remove the pre-collision city buzzer (Click here).

    2. Inspect the pre-collision city buzzer (Click here).

    REPLACE PRE-COLLISION CITY SENSOR

    (Click here)

    REPLACE PRE-COLLISION CITY BUZZER

    (Click here)