Ignition Switch: Description and Operation

IGNITION KEY HOLE ILLUMINATION LIGHT TIMER CIRCUIT
^ When, with the ignition switch turned to the OFF position, the driver's door is opened (door switch is switched ON), the ECU timer circuit is activated and the ignition key hole illumination light illuminates for 10 seconds.
^ When the ignition switch is turned to the ON position while the timer circuit is activated, the illumination output comes off and the ignition key hole illumination light comes off.

IGNITION KEY REMINDER WARNING BUZZER CIRCUIT
^ When, with the ignition key inserted in the key cylinder (with the key reminder switch at OFF), the driver's door is opened (door switch is switched ON), the ECU detective circuit will function.
^ With the detective circuit activated, buzzer output from the drive circuit makes the buzzer sound intermittently to remind the ignition key.