THEFT DETERRENT SYSTEM Security Horn Circuit

DESCRIPTION

When the theft deterrent system is operating, a relay in the theft warning ECU turns ON and OFF continuously at 0.4 seconds intervals, causing the security horn to sound.

WIRING DIAGRAM

A01J53SE02

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT SECURITY HORN ASSEMBLY

    A01J64E

    1. Apply battery voltage to the horn and check operation of the horn.

      OK
      Measurement Condition Specified Condition

      Battery positive (+) → Terminal 1

      Battery negative (-) → Horn bracket

      		 Horn sounds

    NG

    REPLACE SECURITY HORN ASSEMBLY

    OK

  2. CHECK WIRE HARNESS (THEFT WARNING ECU - SECURITY HORN)

    A01J537E02

    1. Disconnect the T16 ECU connector.

    2. Disconnect the S1 horn connector.

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

      Standard resistance
      Tester Connection Specified Condition
      T16-13 (SH-) - S1-1 Below 1 Ω
      T16-13 (SH-) or S1-1 - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    REPLACE THEFT WARNING ECU