Please focus your attention here, it's very important!!!
If any of them is different from your original remote control, this remote control will not work.
  • FCC ID: N14TMTX-1(Please open the back cover of your original old remote key to check)
  • Chip: 4C(ask a locksmith or deale will help)
  • Button: 3  (look the same as the remote in the link)

COMPATIBILITY:

  • for Lexus RX300 1999 2000 2001 2002 2003 2004
PCB Remote Board, Chip Inside.
Must be sure the information in red before buying. 

Please find a locksmith programming, generally than most dealers can only program OEM remote control.
You can check the FCC ID or P/N from your original old remote key or use the VIN code to ask a dealer or locksmith.