THEFT DETERRENT SYSTEM Security Horn Circuit

DTC Code DTC Name
Security Horn Circuit

DESCRIPTION

When the theft deterrent system is switched from the armed state to the alarm sounding state, the main body ECU (multiplex network body ECU) transmits a signal to cause the security horn to sound at intervals of 0.4 seconds.

WIRING DIAGRAM

B341517E01

CAUTION / NOTICE / HINT

Note:

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

  • When replacing the main body ECU (multiplex network body ECU), make sure to replace it with a new one.

PROCEDURE

  1. PERFORM ACTIVE TEST USING GTS (SECURITY HORN)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Main Body / Active Test.

    5. According to the display on the GTS, perform the Active Test.

      Body Electrical > Main Body > Active Test

      Tester Display

      Measurement Item

      Control Range

      Diagnostic Note

      Security Horn

      Security indicator

      ON or OFF

      -

      Body Electrical > Main Body > Active Test

      Tester Display

      Security Horn

      OK

      The security horn assembly sounds and stops correctly when operated through the GTS.

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    Click here

    NG

  2. INSPECT SECURITY HORN ASSEMBLY

    1. Remove the security horn assembly.

      Click here

    2. Inspect the security horn assembly.

      Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE SECURITY HORN ASSEMBLY

    Click here

    OK

  3. INSPECT SECURITY HORN RELAY

    1. E270109E01

      Remove the security horn relay.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      3 - 5

      Battery voltage is applied between terminals 2 - 1

      Below 1 Ω

      3 - 5

      Battery voltage is not applied between terminals 2 - 1

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE SECURITY HORN RELAY

    OK

  4. CHECK HARNESS AND CONNECTOR (SECURITY HORN RELAY - MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU])

    1. Remove the main body ECU (multiplex network body ECU).

      Click here

    2. Connect the instrument panel junction block assembly connectors.

    3. Remove the security horn relay.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      2 - A-17 (SH)

      Always

      Below 1 Ω

      2 - Body ground

      Always

      10 kΩ or higher

      A-17 (SH) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    CHECK HARNESS AND CONNECTOR (SECURITY HORN RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (BATTERY - SECURITY HORN RELAY)

    1. B341518

      Remove the security horn relay.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      1 - Body ground

      Always

      11 to 14 V

      5 - Body ground

      Always

      11 to 14 V

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (SECURITY HORN RELAY - SECURITY HORN ASSEMBLY AND BODY GROUND)

    1. Remove the security horn relay.

    2. Disconnect the A13 security horn assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      3 - A13-1

      Always

      Below 1 Ω

      A13-2 - Body ground

      Always

      Below 1 Ω

      3 - Body ground

      Always

      10 kΩ or higher

      A13-1 - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. CHECK HARNESS AND CONNECTOR (SECURITY HORN RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

    1. Disconnect the 3D instrument panel junction block assembly connector.

    2. Remove the security horn relay.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      2 - 3D-53

      Always

      Below 1 Ω

      2 - Body ground

      Always

      10 kΩ or higher

      3D-53 - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR