NHTSA ID Number: 10152266
Manufacturer Communication Number: T-TT-0377-15
TSB/Document Date: 2018-12-17
Summary
TT: 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.
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TSB/Document ID: T-TT-0377-15
Replacement Service Bulletin Number:
MFR Communication Date: 2015-12-01
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: EQUIPMENT
MFR Component System:
MFR Component Subsystem:
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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
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