RX 300 FWD V6-3.0L (1MZ-FE) (1999)
Key Reminder Switch: Description and Operation
KEY REMINDER SYSTEM
If the driver door is opened with the ignition SW set at the ACC or OFF position and the ignition key remained inserted into the key cylinder (The
unlock warning SW is ON), the signal from the unlock warning SW is input to TERMINAL KSW of the body ECU and the signal from the door
courtesy SW front LH is input to TERMINAL CTY of driver door ECU. As a result, through communication control of the body ECU and door
ECU etc. the buzzer in the combination meter goes ON to warn the driver that the ignition key is still inserted.