It works on mine. Try it this way - rather than just pressing the button once to turn it on, hold it down for about 2-3 seconds instead. That's the way I have to do it on mine. It will work for about 20 minutes then auto shut off, but if I hold down the power button for a couple of seconds it will come back on again for another 20 mins.

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2001 X5 4.4i
2002 Honda S2000