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THEFT DETERRENT SYSTEM Security Horn Circuit

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DTC Code DTC Name
  Security Horn Circuit
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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.

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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

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

  • If the main body ECU (multiplex network body ECU) is replaced, refer to the Service Bulletin.

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PROCEDURE


  1. Click here

    PERFORM ACTIVE TEST USING GTS (SECURITY HORN)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    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.


      1. Body Electrical > Main Body > Active Test
        Tester Display Measurement Item Control Range Diagnostic Note
        Security Horn Security horn assembly ON or OFF -



      1. 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

  2. Click here

    INSPECT SECURITY HORN ASSEMBLY


    1. Remove the security horn assembly.

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    2. Inspect the security horn assembly.

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      Result
      Proceed to
      OK
      NG

  3. Click here

    INSPECT SECURITY WARNING RELAY (S-HORN RELAY)


    1. B004RK6E01

      Remove the security warning relay (S-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

    • OKClick here
    • NG

      REPLACE SECURITY WARNING RELAY (S-HORN RELAY)

  4. Click here

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


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

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    2. Connect the instrument panel junction block assembly connectors.

    3. Remove the security warning relay (S-HORN relay).

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 - A-29 (SH) Always Below 1 Ω
      2 - Body ground Always 10 kΩ or higher
      A-29 (SH) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

  5. Click here

    CHECK HARNESS AND CONNECTOR (BATTERY - SECURITY WARNING RELAY [S-HORN RELAY])


    1. B004TQV

      Remove the security warning relay (S-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

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  6. Click here

    CHECK HARNESS AND CONNECTOR (SECURITY WARNING RELAY [S-HORN RELAY] - SECURITY HORN ASSEMBLY AND BODY GROUND)


    1. Remove the security warning relay (S-HORN relay).

    2. Disconnect the A24 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 - A24-1 Always Below 1 Ω
      3 - Body ground Always 10 kΩ or higher
      A24-1 - 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. Click here

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


    1. Disconnect the 5F instrument panel junction block assembly connector.

    2. Remove the security warning relay (S-HORN relay).

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 - 5F-30 Always Below 1 Ω
      2 - Body ground Always 10 kΩ or higher
      5F-30 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLYClick here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR