I have an 06 RX 400h...hold down the button on the key pod that reads "PWR DOOR" ,it's the lower right of the three. You might have been given the key that doesn't have that...like the type that you would give a valet and didn't have this button...but all of the second gen RXs have the auto door...I am pretty sure...anyway, I love it...it doesn't pop the hatch, it opens it. On the inside you have the power door button to open it from the drivers seat. Oh, if you do have the power button on the pod, you have to hold it for a couple of seconds until you hear a couple of beeps. Let us know....Rey
Thanks very much everyone. Works perfectly!