Toyota Lexusc Owner's Handbook Manual page 118

(s) Key Reminder Buzzer
This buzzer reminds you to remove the key when you open the
driver's door with the ignition key in the "ACC" or "LOCK"
position.
(t) Open Moon Roof Reminder Buzzer
This buzzer reminds you to close the moon roof when you turn
the ignition key to the "ACC" or "LOCK" position and open the
driver's door.
GAUGES, METERS AND SERVICE REMINDER INDICATORS
How to check all the service reminder
indicators
(except the low fuel level warning light):
1. Apply the parking brake.
2. Open the door.
The following service reminder indicator should come on. It
goes off when you close the door completely.
13RY028
3. Turn the ignition key to the "ON" position.
The following service reminder indicators should come on.
D Height control indicator lights
D Height control off indicator light
D Easy access mode indicator light
D Dynamic laser cruise control master warning light
99