Circuit Description
WARNING: This page is about a different car, the 2003 Lexus ES 300 and 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
Key unlock warning switch signals are transmitted to the body ECU. When the key is in the ignition switch lock cylinder and the driver's door is opened, the body ECU commands the meter ECU to sound the buzzer inside the meter ECU. For circuit identification, see Figure.