Toyota Tundra. Manual — part 138

Steering Pad Switch Function:

PROBLEM SYMPTOMS

"Bluetooth" Function*:

Abnormal noise occurs, (for built-
in type amplifier system)

Proceed to "Noise occurs"

NOISE OCCURS

Radio receiver (for Column Shift
Type)

RADIO RECEIVER (FOR

COLUMN SHIFT TYPE)

Radio receiver (for Floor Shift
Type)

RADIO RECEIVER (FOR

FLOOR SHIFT TYPE)

Radio broadcast cannot be
received or poor reception.

Proceed to "Radio Broadcast
cannot be Received (Poor
Reception)"

RADIO BROADCAST

CANNOT BE RECEIVED (BAD

RECEPTION)

CD cannot be inserted / played or
CD is ejected right after insertion.

Radio receiver power source
circuit

RADIO RECEIVER POWER

SOURCE CIRCUIT

Proceed to "CD cannot be
Inserted / Played or CD is Ejected
Right After Insertion"

CD CANNOT BE INSERTED /

PLAYED OR CD IS EJECTED

RIGHT AFTER INSERTION

CD cannot be ejected.

Radio receiver power source
circuit

RADIO RECEIVER POWER

SOURCE CIRCUIT

Proceed to "CD cannot be
Ejected"

CD CANNOT BE EJECTED

Sound quality is bad only when
CD is played. (Volume is too
low.)

Proceed to "Sound Quality is Bad
Only when CD is Played (Volume
is Too Low)"

SOUND QUALITY IS BAD

ONLY WHEN CD IS PLAYED

(VOLUME IS TOO LOW)

CD sound skips.

Proceed to "CD Sound Skips"

CD SOUND SKIPS

Radio receiver cannot be
illuminated at night.

Illumination circuit

ILLUMINATION CIRCUIT

Radio receiver (for Column Shift
Type)

RADIO RECEIVER (FOR

COLUMN SHIFT TYPE)

Radio receiver (for Floor Shift
Type)

RADIO RECEIVER (FOR

FLOOR SHIFT TYPE)

Symptom

Suspected Area

Refer To

Audio system cannot be operated
with steering pad switch.

Steering pad switch circuit

STEERING PAD SWITCH

CIRCUIT

Radio receiver (for Column Shift
Type)

RADIO RECEIVER (FOR

COLUMN SHIFT TYPE)

Radio receiver (for Floor Shift
Type)

RADIO RECEIVER (FOR

FLOOR SHIFT TYPE)

Steering pad switch cannot be
illuminated at night.

Illumination circuit

ILLUMINATION CIRCUIT

Radio receiver (for Column Shift
Type)

RADIO RECEIVER (FOR

COLUMN SHIFT TYPE)

Radio receiver (for Floor Shift
Type)

RADIO RECEIVER (FOR

FLOOR SHIFT TYPE)

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Audio/Visual - Tundra

PROBLEM SYMPTOMS

TERMINALS OF ECU

Symptom

Suspected Area

Refer To

Cellular phone registration
failure, phone directory transfer
failure.

Proceed to "Cellular Phone
Registration Failure, Phone
Directory Transfer Failure"

CELLULAR PHONE

REGISTRATION FAILURE,

PHONE DIRECTORY

TRANSFER FAILURE

Cellular phone cannot send /
receive.

Proceed to "Cellular Phone cannot
Send / Receive"

CELLULAR PHONE CANNOT

SEND /RECEIVE

Steering pad switch circuit

STEERING PAD SWITCH

CIRCUIT

Radio receiver (for Column Shift
Type)

RADIO RECEIVER (FOR

COLUMN SHIFT TYPE)

Radio receiver (for Floor Shift
Type)

RADIO RECEIVER (FOR

FLOOR SHIFT TYPE)

The other caller's voice cannot be
heard, is too quiet, or distorted.

Proceed to "The Other Caller's
Voice cannot be Heard, is too
Quiet, or Distorted"

THE OTHER CALLER'S

VOICE CANNOT BE HEARD,

IS TOO QUIET, OR

DISTORTED

Proceed to "Cellular Phone Voice
Circuit between Radio Receiver
and Stereo Component Amplifier"

CELLULAR PHONE VOICE

CIRCUIT BETWEEN RADIO

RECEIVER AND STEREO

COMPONENT AMPLIFIER

Radio receiver (for Column Shift
Type)

RADIO RECEIVER (FOR

COLUMN SHIFT TYPE)

Radio receiver (for Floor Shift
Type)

RADIO RECEIVER (FOR

FLOOR SHIFT TYPE)

Stereo component amplifier

STEREO COMPONENT

AMPLIFIER

The other caller cannot hear your
voice, or your voice is too quiet
or distorted.

Proceed to "The Other Caller
cannot Hear Your Voice, or Your
Voice is too Quiet or Distorted"

THE OTHER CALLER

CANNOT HEAR YOUR

VOICE, OR YOUR VOICE IS

TOO QUIET OR DISTORTED

Proceed to "Microphone Circuit
between Microphone and Radio
Receiver"

MICROPHONE CIRCUIT

BETWEEN MICROPHONE

AND RADIO RECEIVER

Roof console box assembly
(Built-in microphone)

REMOVAL

Radio receiver (for Column Shift
Type)

RADIO RECEIVER (FOR

COLUMN SHIFT TYPE)

Radio receiver (for Floor Shift
Type)

RADIO RECEIVER (FOR

FLOOR SHIFT TYPE)

HINT:
*: w/ Built-in "Bluetooth" Receiver Antenna

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Audio/Visual - Tundra

1. CHECK RADIO RECEIVER (for Separate Type Amplifier System)

Fig. 17: Identifying Radio Receiver Connectors Terminals (Separate Type Amplifier System)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

TERMINALS REFERENCE

Terminal No.

(Symbols)

Wiring

Color

Terminal Description

Condition

Specified Condition

K4-1 (B) - K4-

20 (GND)

L - W-B

Battery

Always

11 to 14 V

K4-2 (ILL+) -
K4-20 (GND)

SB - W-B Illumination signal

Light control switch
OFF --> TAIL

Below 1 V --> 11 to 14
V

K4-5 (ATX+) -

K4-20 (GND)

V - W-B

AVC-LAN
communication signal

Ignition switch ACC

2 to 3V

K4-7 (MUTE) -

K4-20 (GND)

GR - W-B MUTE signal

Audio system is playing
--> Changing modes

Above 3.5 V --> Below
1 V

K4-8 (R+) - K4-

20 (GND)

W - W-B

Sound signal (Right)

Audio system is playing

A waveform
synchronized with
sounds is output

K4-9 (L+) - K4-

20 (GND)

G - W-B

Sound signal (Left)

Audio system is playing

A waveform
synchronized with
sounds is output

K4-10(SLD) -

Body ground

Shielded -

Body ground

Shield ground

Always

Below 1 V

K4-11 (ACC) -

K4-20 (GND)

GR - W-B Accessory (ON)

Ignition switch ACC

10 to 14V

K4-12(ILL-) -

K4-20 (GND)

O - W-B

Illumination (rheostat)
signal

Light control switch
OFF --> TAIL

Below 1 V --> Pulse
generation

K4-15 (ATX-) -

K4-20 (GND)

P - W-B

AVC-LAN
communication signal

Ignition switch ACC

2 to 3V

K4-18(R-) - K4-

20 (GND)

R - W-B

Sound signal (Right)

Audio system is playing

A waveform
synchronized with
sounds is output

K4-19(L-) - K4-

20 (GND)

B - W-B

Sound signal (Left)

Audio system is playing

A waveform
synchronized with
sounds is output

K4-20 (GND) -

Body ground

W-B - Body

ground

Ground

Always

Below 1 V

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Audio/Visual - Tundra

K3-6 (SWG) -

K4-20 (GND)

BR - W-B

Steering pad switch
ground

Always

Below 1 V

K3-7(SW1) -

K4-20 (GND)

LG - W-B

Steering pad switch
signal

Steering pad switch not
operated

4 V or more

--> Seek+ switch

pushed

--> Approx. 0.5 V

--> Seek- switch pushed --> Approx. 0.9 V
--> Volume+ switch
pushed

--> Approx. 2.0 V

--> Volume- switch
pushed

--> Approx. 3.4 V

K3-8 (SW2) -

K4-20 (GND)

GR - W-B

Steering pad switch
signal

Steering pad switch not
operated

4 V or more

--> MODE switch

pushed

--> Approx. 0.5 V

--> On Hook switch
pushed

--> Approx. 0.9 V

--> Off Hook switch
pushed

--> Approx. 2.0 V

K3-11 (IVO+) -

K4-20 (GND)

Y - W-B

Voice signal

"Bluetooth" handsfree
voice signal is playing

A waveform
synchronized with
sounds is output

K3-12(IVO-) -

K4-20 (GND)

BR - W-B Voice signal

"Bluetooth" handsfree
voice signal is playing

A waveform
synchronized with
sounds is output

K3-13(SLD1) -

Body ground

Shielded -

Body ground

Shield ground

Always

Below 1 V

K3-15(ARI) -

K4-20 (GND)

R - W-B

Sound signal (Right)

External device is
playing (When stereo
jack is used)

A waveform
synchronized with
sounds is output

K3-16(ASGN) -

K4-20 (GND)

W - W-B

Ground

Always

Below 1 V

K3-17(ALI) -

K4-20 (GND)

B - W-B

Sound signal (Left)

External device is
playing (When stereo
jack is used)

A waveform
synchronized with
sounds is output

K3-18(AUXG) -

Body ground

Shielded -

Body ground

Shield ground

Always

Below 1 V

K3-19 (AUXI) -

K4-20 (GND)

SB - W-B

External device
connection detection
signal

External device is
connected

Below 1 V

K9-1 (MIC-) -

K4-20 (GND)

Y - W-B

Microphone voice
signal

Bluetooth handsfree
function is ON

A waveform
synchronized with
sounds is output

K9-2 (MIC+) -

K4-20 (GND)

BR - W-B

Microphone voice
signal

Bluetooth handsfree
function is ON

A waveform
synchronized with

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Audio/Visual - Tundra