Lexus 2004 GX470 Owner's Manual page 80

You need to reset the light after the engine oil replacement.
Reset the light by following the procedure below:
1. Turn the ignition key to the "OFF" position with the odometer
reading shown. (For details, see "Odometer and trip meter" on
page 55.)
2. Turn the ignition key to the "ON" position while holding down
the trip meter reset knob.
Hold down the knob until the light goes off. Before the light
goes off, it illuminates for 3 seconds, flashes for 2 seconds and
illuminates for 1 second.
If the system fails to reset, the light will remain flashing. In this
case, return to step 1 and try again.
(n) Low Fuel Level Warning Light
This light comes on when the fuel level in the tank becomes
very low. Fill the tank as soon as possible.
On inclines or curves, due to the movement of fuel in the tank,
the low fuel level warning light may come on earlier than usual.
(o) Low Washer Fluid Warning Light
This light comes on when the fluid level in the tank becomes
very low. Fill the tank as soon as possible.
(p) 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.
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.
3. Place the four-wheel drive control lever in "N" position and
the selector lever in "P" position and turn the ignition key to
"ACC".
The following service reminder indicator should come on. It
goes off when you place the four-wheel drive control lever in
"H" or "L" position.
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