Lexus 2004 GX470 Owner's Manual page 81

GAUGES, METERS AND SERVICE REMINDER INDICATORS
4. Turn the ignition key to "ON".
The following service reminder indicators should come on.
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The following service reminder indicator goes off after a few
seconds.
The anti-lock brake system warning light, vehicle stability
control system off indicator light and vehicle stability control
system and active traction control system warning light may
stay on for about 60 seconds after the ignition key is turned to
the "ON" position. It is normal if they go out after a while.
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The following service reminder indicator should come on. It
goes off after about 6 seconds.
If any service reminder indicator or warning buzzer does not
function as described above, have it checked by your Lexus
dealer as soon as possible.