I have a 2010 Lexus and it works fine. I press and hold the home button, which launches Siri. It takes about 2-3 seconds for the bluetooth to activate and bring sound from the phone over the speakers. During this time, Siri of course has already activated. You have to push the Siri button one or two times to re-activate it. NOT the home button. Just the Siri button. Then you're good to go until you're done. The only thing it doesn't do, is if you tell Siri to make a call for you, in the second it takes for the iPhone to switch over to the voice call, the bluetooth from Lexus disconnects, which in turn ends the call on the phone before it even starts. That's the only thing I find that doesn't work.