Lexus 2003 LS Owner's Manual page 73

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When any door or trunk is open with the ignition switch
turned on at 5 km/h (3 mph) or higher vehicle speed, the
master warning light flashes, a message indicating which
door or trunk is open appears, and a warning tone sounds.
If you continue driving with any door or trunk open, the warning
light starts flashing and a warning tone sounds to remind you
to close the door or trunk.
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If the driver's door is opened with the ignition switch
turned off and the moon roof opened, the master warning
light flashes, the above message appears and a warning
tone sounds for 8 seconds.
GAUGES, METERS AND SERVICE REMINDER INDICATORS
If you start driving with the parking brake applied, the
master warning light flashes, the above message appears
and a warning tone sounds.
If the vehicle skid control system or the traction control
system malfunctions, the master warning light and "VSC
OFF" indicator light come on. At this time the warning
message appears in the multi–information display. And
the warning tone sounds.
If the message appears, the vehicle skid control system and
traction control system do not work. Although it is no problem
to continue driving, have your vehicle checked by Lexus dealer
as soon as possible.
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