Mrs.Shaffer

Help! I have a 2006 Lexus RX400h that I purchased with only one key (the master with the 3 buttons). I can open the doors manually and start/drive the vehicle but the buttons aren't working. The buttons did not work when I got it but the red light on the fob lights up and it is putting out a frequency, however, the buttons will not unlock/lock the door or open the rear hatch. I have tried to self program it but it did not work. It does not enter the programming mode as it should. I do not want to take it to the dealership and to waste money if nothing can be done. Any suggestions?