Here is the procedure I used today and it worked fine:

1. The engine temp should be at a normal operating level and the car should be on a level surface.
2. Turn off the engine.
3. Turn on the ignition switch, but do not start the engine.
4. Press and hold the status indicator pushbutton switch (a more technical term...) for 3-5 seconds.
5. 1-2 seconds after releasing the switch, you will see an oil icon in the trip odometer display location and a clock icon in the odometer display.
6. Press the pushbutton twice, and the oil indicator will read ok, high, 1 Qt Low, or 2 Qt Low.
7. If the display continues to read blank. there is a problem with the sensor.
8. The display will clear itself in about 10 seconds, or you can clear it immediately by pressing the pushbutton one more time.

I tried this three times, and it worked each time. This method eliminates the five minute wait after stopping the engine. The only problem with this method is that it will reset your trip odometer.