Lexus 2003 LS Owner's Manual page 74

GAUGES, METERS AND SERVICE REMINDER INDICATORS
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If the "CHANGE A/C FILTER" appears on the
multi–information display, change the air conditioning
filter as soon as possible because the air filter might have
clogged.
Replace the air conditioning filter in the glove box. After
replacing, push and hold the "OFF" button for the front air
conditioning for about more than 4 seconds to reset the
corresponding data. See "Air conditioning filter " on page 194
for details.
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If you push the "OFF" button for the front air conditioning
for about more than 4 seconds after the replacement of the
air conditioning filters, the above message appears and
the attention tone sounds to inform you that the data has
been reset.
When you push the "OFF" button for the front air conditioning
for more than 4 seconds before "CHANGE A/C FILTER"
appears, the data will be cleared. Do not reset the data before
this message appears.
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In the following cases, the master warning light comes on,
the above message appears and a warning tone sounds.
A When the headlight switch is turned to the first or second
clickstop with one or more tail light bulbs burned out.
A When the brake pedal is held down with one or more stop
light bulbs burned out.
Have defective bulbs replaced as soon as possible.
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When the engine oil level is too low, the master warning
light flashes, the above message appears, and a warning
tone sounds.
Add oil as soon as possible. (For instructions, see "Checking
the engine oil level" on page 359.)
While driving on steep inclines or rough roads which causes
the vehicle to substantially sway or on curves. This message
may appear due to the movement of engine oil in the engine.
In normal conditions, due to engine oil consumption, this
message may appear earlier than the specified service interval
of the scheduled maintenance. This is because the engine oil
is consumed to the low level within the scheduled maintenance
interval and does not indicate a problem. (For detailed
information, see "Facts about engine oil consumption" on page
357.)