THEFT DETERRENT SYSTEM Security Horn Circuit

DESCRIPTION

When the theft deterrent system is in the alarm sounding state, the main body ECU (multiplex network body ECU) outputs a signal repeatedly at 0.4 second intervals, causing the security horn assembly to sound.

WIRING DIAGRAM

A005IM1E06

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (SECURITY HORN)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

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

    5. according to the display on the tester, perform the Active Test.

      Main Body
      Tester Display Test Part Control Range Diagnostic Note
      Security Horn Security horn ON/OFF -
      OK
      The security horn sounds and stops correctly when operating it through the intelligent tester.

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

  2. INSPECT EU-DRL/S-HORN RELAY


    1. A005LEBE17

      Remove the EU-DRL/S-HORN relay from engine room sub relay block.

    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 not applied to terminals 1 and 2 10 kΩ or higher
      Battery voltage is applied to terminals 1 and 2 Below 1 Ω

    NG

    REPLACE EU-DRL/S-HORN RELAY

    OK

  3. INSPECT SECURITY HORN ASSEMBLY


    1. Remove the security horn assembly Click here.

    2. Inspect the security horn assembly Click here.


    NG

    REPLACE SECURITY HORN ASSEMBLY Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (EU-DRL/S-HORN RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND SECURITY HORN)


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

    2. Disconnect the A14 security horn assembly connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      Relay terminal 2 - 3C-20 Always Below 1 Ω
      Relay terminal 3 - A14-1 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      3C-20 - Body ground Always 10 kΩ or higher
      A14-1 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. A005K7JE01

      Remove the instrument panel junction block assembly Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3C-20 - MB-17 (SH) Always Below 1 Ω
      Text in Illustration
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here