GS300 2003 - Key starts car and works manually but won't unlock doors or boot remotely

[Sexy Lexy]

When I press the buttons on the key to lock, unlock or open the boot nothing happens.  I put new batteries in both the primary and spare keys but the problem prevails.  I can open the doors and boot manually and the key will start the car no problem.  Anyone got any suggestions.  My feeling is its not a problem with the key itself.

[LTuned]

 

Maybe check if the batteries are installed the correct way.  Or take it to Lexus and get them to check it.  

I have had no problems with mine except the batteries going flat.