Lexus 2004 LS430 Owner's Manual page 132

INTERIOR EQUIPMENT
To turn on the interior light, slide the switch.
With the switch in the "DOOR" position, the light comes on
when any doors are opened or when the ignition switch is
turned to "LOCK". After all the doors are closed, the light
remains on for about 15 seconds and then goes out.*
However, in the following cases, the light goes out
immediately:
1. All the doors are closed when the ignition switch is in "ACC"
or "ON" position.
2. The ignition switch is turned to "ACC" or "ON" when the light
is still on.
3. All the doors are locked when the light is still on.
4. One door is closed with the lock button pushed in while the
other doors are locked.
NOTE:
* The interior lights can be set not to come on or the duration
of lighting can be changed.
Ask your Lexus dealer for details.
112
Rear
14L209
" Vehicles with rear air conditioning controls
14L210
" Vehicles without rear air conditioning controls
When you open the rear door, the light turns on. Closing
it turns off the light.