THEFT DETERRENT SYSTEM Security Horn Circuit

DESCRIPTION

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

WIRING DIAGRAM

A01E25AE01

INSPECTION PROCEDURE

Note

When replacing the theft warning ECU assembly, refer to the registration procedures Click here.

PROCEDURE


  1. INSPECT SECURITY HORN ASSEMBLY


    1. A01DZ1R

      Remove the security horn assembly.

    2. 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 HARNESS AND CONNECTOR (THEFT WARNING ECU - SECURITY HORN)


    1. Disconnect the T36*1 or T39*2 theft warning ECU assembly connector.


      • *1: except 2 Step Unlock Function

      • *2: for 2 Step Unlock Function

    2. Disconnect the S1 security horn assembly connector.

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

      Standard Resistance
      except 2 Step Unlock Function
      Tester Connection Condition Specified Condition
      T36-13 (SH-) - S1-1 Always Below 1 Ω
      T36-13 (SH-) or S1-1 - Body ground Always 10 kΩ or higher
      for 2 Step Unlock Function
      Tester Connection Condition Specified Condition
      T39-26 (SH-) - S1-1 Always Below 1 Ω
      T39-26 (SH-) or S1-1 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE THEFT WARNING ECU ASSEMBLY