THEFT DETERRENT SYSTEM Horn Circuit

DESCRIPTION

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

WIRING DIAGRAM

A0043H5E01

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT HORNS


    1. Press the horn switch and check if the horns sound.

      Result
      Result Proceed to
      Horns sound A
      Horns do not sound B

    B

    GO TO HORN SYSTEM Click here

    A

  2. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Select the item below in the Active Test and then check that the horns operate.

      Main Body
      Tester Display Test Part Control Range Diagnostic Note
      Vehicle Horn Vehicle horns ON / OFF -
      Result
      Result Proceed to
      The vehicle horns do not sound and stop correctly when operated through the GTS A
      The vehicle horns sound and stop correctly when operated through the GTS B

    B

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

    A

  3. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


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

      A0042NBE06

    2. Disconnect the 2C instrument panel junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2C-24 - A-28 (HORN) Always Below 1 Ω
      Text in Illustration
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    OK

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