THEFT DETERRENT SYSTEM 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

A01G9XHE01

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. A01GDGBE01

      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. A01GA6O

      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