THEFT DETERRENT SYSTEM (w/ Smart Entry and Start 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

A017CYUE02

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 engine switch on (IG).

    3. Turn the intelligent tester main switch 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 -
      OK
      The vehicle horns sound and stop correctly when operating them through the intelligent tester.

    NG

    CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - ENGINE ROOM JUNCTION BLOCK) Click here

    OK

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

  3. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - ENGINE ROOM JUNCTION BLOCK)


    1. Disconnect the 1D instrument panel junction block connector and 2D engine room junction block connector.

      A017F7TE02

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

      Standard resistance
      Tester Connection Condition Specified Condition
      1D-11 - 2D-10 Always Below 1 Ω
      1D-11 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)