Toyota Tundra. Manual — part 481

TERMINALS OF ECU

1. CHECK NAVIGATION RECEIVER

Fig. 72: Identifying ECU Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Poor sound quality in all modes
(low volume)

All Modes (Low Volume)"

ALL MODES (LOW

VOLUME)

Navigation receiver power source
circuit

NAVIGATION RECEIVER

ASSEMBLY POWER SOURCE

CIRCUIT

Navigation receiver (for Column
Shift Type)

NAVIGATION RECEIVER

(FOR COLUMN SHIFT TYPE)

Navigation receiver (for Floor
Shift Type)

NAVIGATION RECEIVER

(FOR FLOOR SHIFT TYPE)

External device sound cannot be
heard or sound quality bad (stereo
jack is used).

Sound signal circuit between
navigation receiver and stereo jack
adapter

SOUND SIGNAL CIRCUIT

BETWEEN NAVIGATION

RECEIVER ASSEMBLY AND

STEREO JACK ADAPTER

Stereo jack adapter (for Column
Shift Type)

REMOVAL

Stereo jack adapter (for Floor
Shift Type)

REMOVAL

Navigation receiver power source
circuit

NAVIGATION RECEIVER

ASSEMBLY POWER SOURCE

CIRCUIT

Navigation receiver (for Column
Shift Type)

NAVIGATION RECEIVER

(FOR COLUMN SHIFT TYPE)

Navigation receiver (for Floor
Shift Type)

NAVIGATION RECEIVER

(FOR FLOOR SHIFT TYPE)

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Navigation - Tundra

a. Disconnect the K18 receiver connector.

b. Measure the resistance and voltage according to the value(s) in the table below.

NAVIGATION RECEIVER RESISTANCE AND VOLTAGE

If the result is not as specified, there may be a malfunction on the wire harness side.

c. Reconnect the K18 receiver connector.

d. Measure the voltage according to the value(s) in the table below.

NAVIGATION RECEIVER VOLTAGE

Terminal No. (Symbols) Wiring Color

Terminal

Description

Condition

Specified

Condition

K18-20 (GND) - Body

ground

W-B - Body

ground

Ground

Always

Below 1 ohms

K18-1 (B) - K18-20

(GND)

L - W-B

Battery

Always

11 to 14 V

K18-11 (ACC) - K18-20

(GND)

GR - W-B

ACC power supply

Ignition switch

OFF

Below 1 V

K18-11 (ACC) - K18-20

(GND)

GR - W-B

ACC power supply

Ignition switch

ACC

11 to 14 V

Terminal No.

(Symbols)

Wiring

Color

Terminal

Description

Condition

Specified Condition

K18-2 (ILL+)

- K18-20

(GND)

SB - W-B Illumination signal

Light control switch OFF

Below 1 V

K18-2 (ILL+)

- K18-20

(GND)

SB - W-B Illumination signal

Light control switch TAIL or

HEAD

11 to 14 V

K18-12 (ILL-)

- K18-20

(GND)

O - W-B Illumination signal

Light control switch OFF

Below 1 V

K18-12 (ILL-)

- K18-20

(GND)

O - W-B Illumination signal

Light control switch TAIL or

HEAD

11 to 14 V

K18-15

(ATX-) - K18-

20 (GND)

P - W-B

AVC-LAN

communication

signal

Ignition switch ACC

2 to 3V

K18-5

(ATX+) -

K18-20

(GND)

V - W-B

AVC-LAN

communication

signal

Ignition switch ACC

2 to 3V

K21-13

(SLD1) - K18-

20 (GND)

Shielded

- W-B

Shielded ground

Always

Below 1 V

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Navigation - Tundra

K21-12 (IVO-

) - K18-20

(GND)

BR - W-

B

Voice guidance

signal

Voice guidance is provided

Waveform
synchronized with
sounds is output

K21-11

(IVO+) - K18-

20 (GND)

Y - W-B

Voice guidance

signal

Voice guidance is provided

Waveform
synchronized with
sounds is output

K18-7

(MUTE) -

K18-20

(GND)

GR - W-

B

Mute signal

Audio system playing -->

changing modes

Above 3.5 --> Below

1 V

K18-10 (SLD)

- K18-20

(GND)

Shielded

- W-B

Shielded

Always

Below 1 V

K18-8 (R+) -

K18-20

(GND)

W - W-B Sound signal (right)

Audio system is playing

Waveform
synchronized with
sound is output

K18-18 (R-) -

K18-20

(GND)

R - W-B Sound signal (right)

Audio system is playing

Waveform
synchronized with
sound is output

K18-9 (L+) -

K18-20

(GND)

G - W-B Sound signal (left)

Audio system is playing

Waveform
synchronized with
sound is output

K18-19 (L-) -

K18-20

(GND)

B - W-B Sound signal (left)

Audio system is playing

Waveform
synchronized with
sound is output

K6-3 (SPD) -

K18-20

(GND)

W - W-B

Speed signal from

combination meter

See "Vehicle Signal Check"
mode (see DISPLAY
CHECK MODE )

-

K7-12 (TSW-)

- K18-20

(GND)

W-B -

W-B

Telephone related

switch ground

Always

Below 1 V

K7-18

(SGND) -

K18-20

(GND)

W-B -

W-B

Telephone related

switch ground

Always

Below 1 V

K6-5 (REV) -

K18-20

(GND)

G - W-B

Reverse signal

See "Vehicle Signal Check"
mode (see DISPLAY
CHECK MODE )

-

K5-3 (VAL+)

- K18-20

(GND)

B - W-B

Aux sound signal

(left)

External device is playing
(When stereo jack is used)

Waveform
synchronized with
sound is output

K5-2 (VAR+)

- K18-20

(GND)

R - W-B

Aux sound signal

(right)

External device is playing
(When stereo jack is used)

Waveform
synchronized with
sound is output

K5-5 (VA-) -

K18-20

W - W-B

Shielded ground

Always

Below 1 V

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Navigation - Tundra

(GND)

K5-6 (ADPG)

- K18-20

(GND)

SB - W-B

External device

connection

detection signal

External device is connection

Below 1 V

K21-7 (SW1)

- K18-20

(GND)

LG - W-

B

Steering pad switch

signal

Steering switch not pushed

4 to 6V

K21-7 (SW1)

- K18-20

(GND)

LG - W-

B

Steering pad switch

signal

Steering switch Seek+ switch
pushed

Approx. 0.5 V

K21-7 (SW1)

- K18-20

(GND)

LG - W-

B

Steering pad switch

signal

Steering switch Seek-switch
pushed

Approx. 0.9 V

K21-7 (SW1)

- K18-20

(GND)

LG - W-

B

Steering pad switch

signal

Steering switch Volume+
switch pushed

Approx. 2.0 V

K21-7 (SW1)

- K18-20

(GND)

LG - W-

B

Steering pad switch

signal

Steering switch Volume-
switch pushed

Approx. 3.4 V

K21-6 (SWG)

- K18-20

(GND)

BR - W-

B

Steering pad switch

signal

Always

Below 1 V

K21-8 (SW2)

- K18-20

(GND)

GR - W-

B

Steering pad switch

signal

Steering switch not pushed

4 to 6V

K21-8 (SW2)

- K18-20

(GND)

GR - W-

B

Steering pad switch

signal

Steering switch MODE
pushed

Approx. 0.5 V

K21-8 (SW2)

- K18-20

(GND)

GR - W-

B

Steering pad switch

signal

Steering switch On Hook
pushed

Approx. 0.9 V

K21-8 (SW2)

- K18-20

(GND)

GR - W-

B

Steering pad switch

signal

Steering switch Off Hook
pushed

Approx. 2.0 V

K21-8 (SW2)

- K18-20

(GND)

GR - W-

B

Steering pad switch

signal

Steering switch Voice pushed

Approx. 3.4 V

K7-24 (CA+)

- K18-20

(GND)

B - W-B

Television camera

power supply

Ignition switch ON, shift
lever R position

5.5 to 7.05 V

K7-21

(CGND) -

K18-20

(GND)

W - W-B

Television camera

signal ground

Always

Below 1 V

K7-22 (V+) -

Television camera Ignition switch ON, shift

Pulse generation

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Navigation - Tundra