Lock/unlock notification

I have a 2006 Sienna LE and when i lock/unlock the van with the remote the lights flash but there is no audible notification. My friend has the same model (but he bought his in Canada and mine came from the US) and when he locks/unlocks there is a beep (then same sound is used if you put the van in gear with the power door open. Are there instructions to turn this back on?:confused:

Thanks