THEFT DETERRENT SYSTEM Horn Circuit

DESCRIPTION

When the theft deterrent system is switched from the armed state to the alarm sounding state, the main body ECU transmits a signal to cause the horn to sound at 0.4-second intervals.

WIRING DIAGRAM

A01171WE02

INSPECTION PROCEDURE

Note

Inspect the fuses for circuits related to this system before performing the following 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 INTELLIGENT TESTER


    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 Electrical / 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
      Vehicle Horn Vehicle horns ON/OFF -
      OK
      The vehicle horns sound and stop correctly when operating them through the intelligent tester.

    NG

    CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - INTEGRATION RELAY) Click here

    OK

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

  3. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - INTEGRATION RELAY)


    1. A0117E7E01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Integration Relay)
      *2

      Front view of wire harness connector

      (to Instrument Panel Junction Block)

      Disconnect the 3B instrument panel junction block connector and 1D integration relay connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1D-11 - 3B-22*1 Always Below 1 Ω
      1D-9 - 3B-22*2 Always Below 1 Ω
      3B-22 - Body ground Always 10 kΩ or higher

      • *1: for 1ND-TV

      • *2: for 1KR-FE and 1NR-FE


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. REPLACE MAIN BODY ECU


    1. Temporarily replace the main body ECU with a new or normally functioning one Click here.


    NEXT

  5. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    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 Electrical / 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
      Vehicle Horn Vehicle horns ON/OFF -
      OK
      The vehicle horns sound and stop correctly when operating them through the intelligent tester.

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK

    OK

    END (MAIN BODY ECU IS DEFECTIVE)