If you have a NAV equipped TCH:
From page 137 of the NAV supplement:

Changing the Bluetooth settings
You can change the display and settings of
Bluetooth information on the system.
The information displays the following items.
“Device Name”
. . . . The name in the Bluetooth network.
You can change it.
“Passkey”
. . . . The password when you register
your cellular phone in the system.
You can change it into the figure of
4−8 digits.
“Bluetooth Device Address”
. . . . The address peculiar to the system.
You can not change it. If you
have registered two Bluetooth
phones with the same Device
Name or Passkey and you cannot
distinguish one from the other, refer
to it.
When you change the device name or
Passkey, do the followings.
V