Tech Tip T-TT-0377-15
Subject

December 07, 2015
Market

Adjustment of Bluetooth Hands Free Sound Quality
Service Category

Section

Audio/Visual/Telematics

Cellular Communication

USA

Applicability

13CY Audio Systems
APPLICABLE VEHICLES

2014-2016
2016
2015-2016
2016
2015-2016
2015-2016
2015-2016
2014-2016
2014-2016
2014-2016

Camry
Prius
Sienna
Mirai
Prius V
Sequoia
Avalon
Tacoma
Highlander HV
Corolla

2014-2016
2014-2016
2015-2016
2016
2014-2016
2016
2014-2016
2015-2016
2014-2016

Highlander
Tundra
Avalon HV
Land Cruiser
4Runner
RAV4 HV
RAV4
Prius C
Camry HV

CONDITION

Some customers may experience poor outgoing Bluetooth sound quality, this can occur for various
reasons. Current multimedia systems are designed with the ability to adjust Bluetooth sound quality to
compensate for Echo or excessive background noise.
RECOMMENDATIONS

Background on how to use Hands Free Voice Quality Settings






There is a 4 digit code used to set the hands free sound quality
The first digit sets noise level compensation
The second digit sets Echo level compensation
The 3 and 4th digits should always be 0.
You can choose from 0 to 2 for each compensation. 0 is no compensation and 2 is maximum
compensation.

The information below is found in the repair manual section: NAVIGATION / MULTI INFO DISPLAY:
NAVIGATION SYSTEM: OPERATION CHECK

HOW TO ADJUST HANDS-FREE VOICE QUALITY AND VOLUME SETTING
(a) Enter diagnostic mode.
(b) Select "Function Check/Setting" from the "Service Menu" screen.
(c) Select "HF Voice Quality Setting" from the "Function Check/Setting I" screen.
(d) Hands-Free Voice Quality Setting (Voice Quality Type adjustment)

Expires on
Ver. 2.6 09/01/2015 T

12/07/2016

© 2015, Toyota Motor Sales, USA

Page 1 of 4

Tech Tip T-TT-0377-15

December 07, 2015

Subject

Market

Adjustment of Bluetooth Hands Free Sound Quality

USA

Applicability

RECOMMENDATIONS

*a

Numeric Keypad

*b

Setting Button

*c

Reset Button
(1) If necessary, refer to the table below to adjust the voice quality type with the numeric keypad.
(2) When adjusting the settings, use the number pad on the screen to input the voice quality type according to
the table.

Settings
VOICE
PARAMETER
A
(Noise)

B
(Noise)

C
(Echo)
D
(Echo)

Expires on
Ver. 2.6 09/01/2015 T

TARGET PHENOMENON

QUALITY

POSITIVE EFFECT OF

NEGATIVE EFFECT OF

TYPE

CHANGING VOICE QUALITY

CHANGING VOICE QUALITY

The other party hears
background noise when

1000

listening to your voice.
The other party hears a lot
of background noise when

2000

listening to your voice.

The other party hears weak
echoes.

The other party hears
strong echoes.

12/07/2016

0100

0200

The amount of background

The volume of voice the

noise the other party hears
when listening to your voice is

other party hears when
listening to your voice may

reduced.

temporarily drop.

The amount of background

The volume of voice the

noise the other party hears

other party hears when

when listening to your voice is
sharply reduced.

listening to your voice may
temporarily drop.

Sound quality of the other
The amount of echo is reduced
party deteriorates (low
(low level).
level).
The amount of echo is reduced
(high level).

© 2015, Toyota Motor Sales, USA

Sound quality of the other
party deteriorates (high
level).

Page 2 of 4

Tech Tip T-TT-0377-15

December 07, 2015

Subject

Market

Adjustment of Bluetooth Hands Free Sound Quality

USA

Applicability

RECOMMENDATIONS
Settings (When Multiple Phenomenon Occurred)
VOICE
PARAMETER

TARGET PHENOMENON

NEGATIVE EFFECT OF

QUALITY
TYPE

POSITIVE EFFECT OF
CHANGING VOICE QUALITY



A+C

The other party hears
background noise and weak
echoes when listening to your
voice.

noise the other party hears
when listening to your voice
1100



The other party hears
background noise and strong
echoes when listening to your
voice.

background noise and weak
echoes when listening to your



The amount of echo is
reduced (high level).



The amount of background
noise the other party hears
when listening to your voice

2100



voice.

B+D

Expires on
Ver. 2.6 09/01/2015 T

echoes when listening to your
voice.

12/07/2016



is sharply reduced.
The amount of echo is

The amount of background
noise the other party hears
when listening to your voice

2200



is sharply reduced.
The amount of echo is
reduced (high level).

© 2015, Toyota Motor Sales, USA

The volume of
voice may drop
temporarily.
Sound quality of
the other party
deteriorates (low
level).



The volume of
voice may drop
temporarily.



Sound quality of
the other party
deteriorates (high
level).



The volume of
voice may drop
temporarily.



Sound quality of
the other party
deteriorates (low
level).

reduced (low level).


The other party hears a lot of
background noise and strong

The amount of background
noise the other party hears
when listening to your voice
is reduced.

1200

The other party hears a lot of
B+C

is reduced.
The amount of echo is



reduced (low level).



A+D

The amount of background

CHANGING VOICE
QUALITY





The volume of
voice may drop
temporarily.
Sound quality of
the other party
deteriorates (high
level).

Page 3 of 4

Tech Tip T-TT-0377-15

December 07, 2015

Subject

Market

Adjustment of Bluetooth Hands Free Sound Quality

USA

Applicability

RECOMMENDATIONS
HINT:






The default value is "0000".
Settings will be applied when the setting button is selected.
If voice quality type values that are not in the table are input, the setting will not be applied and a positive
effect may not be gained.
If the quality of phone calls decreases due to the changed settings, return the settings to "0000" by pressing
the "INIT" switch.

LINK REFERENCES
This Tech Tip does not contain any link references

Expires on
Ver. 2.6 09/01/2015 T

12/07/2016

© 2015, Toyota Motor Sales, USA

Page 4 of 4