Circuit Description
WARNING: This page is about a different car, the 2003 Lexus IS 300 and 2002 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.
When the anti-theft system is activated, it causes the transistor in the ECU to switch ON and OFF in approximately 0.4 second cycles. This switches the horn relay ON and OFF, thus the horns blow. In this condition, if any of the following operations is done, the transistor in the ECU goes OFF and the horn relay switches OFF, thus stopping the horns from blowing:
- Unlock the front LH or RH door with key.
- Turn the ignition switch to the ON position.
- Unlock the doors with the wireless door lock control system.
- Wait for approximately 60 seconds.
- Push the panic switch of the wireless door lock control system.