System Description

KEY REMINDER WARNING SYSTEM DESCRIPTION
1. The key reminder warning system sounds the combination meter buzzer as a warning when the following occur simultaneously: 1) the power switch is set to OFF or ON (ACC), 2) the key is inserted into the key slot, and 3) the driver side door is opened.

FUNCTION OF COMPONENT

Components	Function
Front door courtesy light switch LH	Detects if driver side door is open or closed and outputs data to multiplex network body ECU.
Key slot (Halfway switch)	Detects if key is / is not in key slot and outputs data to transponder key ECU.
Combination meter	Receives buzzer request signal from transponder key ECU (after transponder key ECU receives halfway switch signal and front door courtesy light switch LH signal). Then combination meter actuates driver circuit to sound built-in multi-buzzer intermittently.

FUNCTION OF DESCRIPTION
1. The key slot transmits a halfway switch status signal to the transponder key ECU. The front door courtesy light switch LH transmits a driver side door courtesy switch status signal to the multiplex network body ECU. With the power switch OFF or ON (ACC), 2 conditions are required to activate the key reminder warning system: 1) the transponder key ECU receives a signal indicating that the key is in the key slot, and 2) the transponder key ECU receives a driver side door open signal via the multiplex network body ECU. If both conditions are satisfied, a buzzer request signal is transmitted from the transponder key ECU to the combination meter assembly via the BEAN. The combination meter assembly then actuates the driver circuit to sound a built-in multi-buzzer intermittently.