I have had my LS460 for 6 months, and I have just recently started having problems with the keyless ignition
It sometimes takes 4 or 5 times to get the car to start.
The dealership can't find anything wrong. It only happens occasionally.
Has anyone else had this problem?

 

do you happen to put the keys together with other car keys or so?

 

Also is it possible, somehow, that the battery has been drained in the keys? If you can get into the car ok (SmartAccess unlocks doors for you, then that should be ok). And if the power is drained, holding the key fob very close to the start button should allow the car to start...unless something is interfering with it.

 

That happened to me way back. Do you have any other wireless transmitters/receivers on your keychain? Mine happened to be that key tag that you tap at ExxonMobil gas stations. Once that was removed from the keyring, it stopped doing what you've just described.