TOYOTA 2012 Avalon - Manual (Page 310)

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3-4. Using the hands-free system (for cellular phone)
Changing the passkey
Select “Set Passkey” by using a voice command or .
Pattern A
Press the talk switch, say a 4 to 8-digit number, and select
“Confirm” by using a voice command or .
Pattern B
Select a 4 to 8-digit number by using .
The number should be input 1 digit at a time.
When the entire number to be registered as a passkey has
been input, press again.
STEP 1
STEP 2
STEP 2
STEP 3