Echo L4-1.5L (1NZ-FE) (2000)
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Alarm Horn: Testing and Inspection
Theft Deterrent Horn Circuit
CIRCUIT DESCRIPTION
When the theft deterrent system is activated, the relay in the ECU turns ON and OFF cycles of approximately 0.2 sec., 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 turns OFF, thus stopping the theft deterrent horn from blowing:
1. Unlock the front LH or RH door with a key.
2. Turn the ignition switch to IG or ON position.
3. Unlock the doors with the wireless door lock control system.
4. Wait for approximately 60 seconds.
Wiring Diagram / Theft Deterrent Horn Circuit
Step 1