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Home >> Lexus >> 2003 >> SC 430 >> Repair and Diagnosis >> External Pages >> Different car >> Section 162 (Key Unlock Warning System - Diagnosis) >> Unlock Warning Switch Circuit >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.

Driver's side key warning switch signals are transmitted to the body ECU. When the key is in the ignition switch lock cylinder, then, once the driver's door is opened, the body ECU commands the meter ECU to sound the buzzer and the buzzer inside the meter ECU sounds.

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