THEFT DETERRENT SYSTEM Horn Circuit

DESCRIPTION

When the theft deterrent system is changed from the armed state to the alarm sounding state, the ECU turns on the HORN relay, causing the vehicle horns to sound at 0.4 seconds intervals.

WIRING DIAGRAM

A01J50JE02

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK HORN ASSEMBLY


    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

    A

  2. CHECK WIRE HARNESS (THEFT WARNING ECU - INTEGRATION RELAY (HORN RELAY) AND BODY GROUND)

    A01J4N3E03

    1. Disconnect the T16 ECU connector.

    2. Disconnect the 1I integration relay connector.

    3. Measure the resistance of the wire harness side connectors.

      Standard resistance
      Tester Connection Specified Condition
      T16-11 (HORN) - 1I-7 Below 1 Ω
      T16-11 (HORN) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    REPLACE THEFT WARNING ECU