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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 456 (Theft Deterrent System - Diagnosis) >> Circuit Inspection >> Theft Deterrent Horn Circuit >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

When the theft deterrent system is activated, the relay in the ECU is turned ON and OFF at of approximately 0.2 sec. interval, causing the theft deterrent horn to blow (See the wiring diagram below).

In this condition, if any of the following operations is done, the relay in the ECU is turned OFF, thus stopping the theft deterrent horn from blowing:

  1. Unlock the driver door with key.
  2. Turn the ignition switch to ON position.
  3. Unlock the doors with the wireless door lock control system.
  4. Wait for approximately 60 seconds.
  5. Press the panic switch of the wireless door lock control system.
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