Toyota Tundra Service Manual: Terminals Of Ecu

TERMINALS OF ECU

1. RADIO AND DISPLAY RECEIVER ASSEMBLY

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

J137-1 (FR+) - J137-7 (GND1)

LA-LG - BR

Sound signal (Front right)

Audio system playing

A waveform synchronized with sound is output

J137-2 (FL+) - J137-7 (GND1)

LA-P - BR

Sound signal (Front left)

Audio system playing

A waveform synchronized with sound is output

J137-3 (ACC1) - J137-7 (GND1)

GR - BR

Power source (ACC)

Ignition switch off

Below 1 V

Ignition switch ACC

11 to 14 V

J137-4 (+B1) - J137-7 (GND1)

LA-SB - BR

Power source (+B)

Always

11 to 14 V

J137-5 (FR-) - J137-7 (GND1)

LA-L - BR

Sound signal (Front right)

Audio system playing

A waveform synchronized with sound is output

J137-6 (FL-) - J137-7 (GND1)

LA-V - BR

Sound signal (Front left)

Audio system playing

A waveform synchronized with sound is output

J137-7 (GND1) - Body ground

BR - Body ground

Ground

Always

Below 1 Ω

J137-9 (AMP) - J137-7 (GND1)*1

G - BR

Power source of stereo component amplifier

Audio system playing

11 to 14 V

J137-10 (ILL+) - J137-7 (GND1)

P - BR

Illumination signal

Ignition switch off

Below 1 V

Light control switch in tail or head position

11 to 14 V

J138-1 (RR+) - J137-7 (GND1)*2

LA-R - BR

Sound signal (Rear right)

Audio system playing

A waveform synchronized with sound is output

J138-2 (RL+) - J137-7 (GND1)*2

LA-B - BR

Sound signal (Rear left)

Audio system playing

A waveform synchronized with sound is output

J138-3 (RR-) - J137-7 (GND1)*2

LA-W - BR

Sound signal (Rear right)

Audio system playing

A waveform synchronized with sound is output

J138-5 (ILL-) - J137-7 (GND1)

BE - BR

Illumination signal

Headlight dimmer switch assembly off

Below 1 V

Headlight dimmer switch assembly in tail or head position

Pulse generation

J138-6 (RL-) - J137-7 (GND1)*2

LA-Y - BR

Sound signal (Rear left)

Audio system playing

A waveform synchronized with sound is output

J139-1 (IG) - J137-7 (GND1)

BE - BR

Power source (IG)

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14

J139-2 (REV) - J137-7 (GND1)

Y - BR

Reverse signal

See "Vehicle Signal Check Mode" in Operation Check (See page )

-

J139-4 (MACC) - J137-7 (GND1)

L - BR

Microphone power supply

Ignition switch off

Below 1 V

Ignition switch ACC

4 to 6 V

J139-5 (MIN+) - J137-7 (GND1)

B - BR

Microphone voice signal

See "Check Microphone" in Operation Check (See page )

-

J139-6 (SNS2) - J137-7 (GND1)

LG - BR

Microphone connection detection signal

Always

Below 1 V

J139-9 (CANH)

BE

CAN communication signal

-

-

J139-10 (CANL)

W

CAN communication signal

-

-

J139-11 (AGND) - Body ground

Shielded - Body ground

Shield ground

Always

Below 1 Ω

J139-15 (PKB) - J137-7 (GND1)

R - BR

Parking Brake signal

See "Vehicle Signal Check Mode" in Operation Check (See page )

-

J139-17 (SPD) - J137-7 (GND1)

LG - BR

Vehicle speed signal from combination meter assembly

See "Vehicle Signal Check Mode" in Operation Check (See page )

-

J139-18 (SGND) - J137-7 (GND1)

Shielded - BR

Shield ground

Always

Below 1 Ω

J139-19 (MIN-) - Body ground

Y - Body ground

Microphone voice signal

See "Check Microphone" in Operation Check (See page )

-

J139-21 (SW1) - J139-23 (SWG)

BE - L

Steering pad switch signal

No switch pushed

2.97 to 3.56 V

Up switch pushed

0.27 to 0.35 V

Down switch pushed

0.86 to 1.03 V

Volume+ switch pushed

1.51 to 1.79 V

Volume- switch pushed

2.22 to 2.66 V

J139-22 (SW2) - J139-23 (SWG)

GR - L

Steering pad switch signal

No switch pushed

2.97 to 3.56 V

MODE/HOLD switch pushed

0.27 to 0.35 V

On hook switch pushed

0.86 to 1.03 V

Off hook switch pushed

1.51 to 1.79 V

Voice switch pushed

2.22 to 2.66 V

J139-23 (SWG) - Body ground

L - Body ground

Steering pad switch signal

Always

Below 1 V

J139-25 (ADPG) - J137-7 (GND1)

SB - BR

External device connection detection signal

External device connected

Below 1 V

External device not connected

2.1 to 3 V

J139-26 (VAR+) - J139-27 (VA-)

B - Y

Sound signal (Right)

External device playing (When stereo jack used)

A waveform synchronized with sound is output

J139-27 (VA-) - J137-7 (GND1)

Y - BR

Sound signal ground

Always

Below 1 Ω

J139-28 (VAL+) - J139-27 (VA-)

L - Y

Sound signal (Left)

External device playing (When stereo jack used)

A waveform synchronized with sound is output

J140-3 (CNH1)

Y

Local bus communication signal

-

-

J140-4 (CNL1)

W

Local bus communication signal

-

-

L2-3 (ACC2) - J137-7 (GND1)*3

Y - BR

Power source (ACC)

Ignition switch off

Below 1 V

Ignition switch ACC

11 to 14 V

L2-4 (+B2) - J137-7 (GND1)*3

R - BR

Power source (+B)

Always

11 to 14 V

L2-8 (GND2) - Body ground*3

B - Body ground

Ground

Always

Below 1 Ω

J122-1 (USV1)

#

Power source

-

-

J122-2 (US1-)

#

Data signal

-

-

J122-3 (US1+)

#

Data signal

-

-

J122-4 (USD1)

#

Ground

-

-

J122-5 (USG1)

Shielded

Shield ground

-

-

K5-1 (USV4)*3

#

Power source

-

-

K5-2 (US4-)*3

#

Data signal

-

-

K5-3 (US4+)*3

#

Data signal

-

-

K5-4 (UGD4)*3

#

Ground

-

-

K5-5 (USG4)*3

Shielded

Shield ground

-

-

K6-1 (LV)*3

#

LVDS communication signal

-

-

J155-1

#

-

-

-

J155-2 - J137-7 (GND1)

# - BR

Power source of antenna

Ignition switch ACC

Radio switch on and AM or FM selected

11 to 14 V

J155-3 (MAIN)

#

-

-

-

  • #: There is not wire color information.
  • *1: for 7 or 9 Speakers
  • *2: except 4 Speakers
  • *3: w/ SDARS System

2. STEREO COMPONENT TUNER ASSEMBLY (w/ SDARS System)

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

L3-3 (ACC2) - L3-8 (GND2)

Y - B

Power source (ACC)

Ignition switch off

Below 1 V

Ignition switch ACC

11 to 14 V

L3-4 (+B2) - L3-8 (GND2)

R - B

Power source (+B)

Always

11 to 14 V

L3-8 (GND2) - Body ground

B - Body ground

Ground

Always

Below 1 Ω

K2-1 (USV4)

#

Power source

-

-

K2-2 (US4-)

#

Data signal

-

-

K2-3 (US4+)

#

Data signal

-

-

K2-4 (UGD4)

#

Ground

-

-

K2-5 (USG4)

Shielded

Shield ground

-

-

K4-1 (LV)

#

LVDS communication signal

-

-

  • #: There is not wire color information.

3. STEREO COMPONENT AMPLIFIER ASSEMBLY (for 7 or 9 Speakers)

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

J144-1 (R+) - J144-7 (GND)

LG - BR

Sound signal (Front right)

Audio system playing

A waveform synchronized with sound is output

J144-2 (L+) - J144-7 (GND)

V - BR

Sound signal (Front left)

Audio system changing mode

A waveform synchronized with sound is output

J144-3 (ACC) - J144-7 (GND)

LG - BR

Power source (ACC)

Ignition switch off

Below 1 V

Ignition switch ACC

11 to 14 V

J144-4 (+B) - J144-7 (GND)

R - BR

Power source (+B)

Always

11 to 14 V

J144-5 (R-) - J144-7 (GND)

L - BR

Sound signal (Front right)

Audio system playing

A waveform synchronized with sound is output

J144-6 (L-) - J144-7 (GND)

P - BR

Sound signal (Front left)

Audio system playing

A waveform synchronized with sound is output

J144-7 (GND) - Body ground

BR - Body ground

Ground

Always

Below 1 Ω

J144-9 (AMP) - Body ground

G - Body ground

Power source of stereo component amplifier

Audio system playing

11 to 14 V

J145-1 (FL+) - J144-7 (GND)

P - BR

Sound signal (Front left)

Audio system playing

A waveform synchronized with sound is output

J145-2 (FR+) - J144-7 (GND)

LG - BR

Sound signal (Front right)

Audio system playing

A waveform synchronized with sound is output

J145-3 (RL+) - J144-7 (GND)

B - BR

Sound signal (Rear left)

Audio system playing

A waveform synchronized with sound is output

J145-4 (WFR+) - J144-7 (GND)

R - BR

Sound signal (Rear right)

Audio system playing

A waveform synchronized with sound is output

J145-5 (WFL+) - J144-7 (GND)

BE - BR

Sound signal (Rear left)

Audio system playing

A waveform synchronized with sound is output

J145-6 (FL-) - J144-7 (GND)

V - BR

Sound signal (Front left)

Audio system playing

A waveform synchronized with sound is output

J145-7 (FR-) - J144-7 (GND)

L - BR

Sound signal (Front right)

Audio system playing

A waveform synchronized with sound is output

J145-8 (RL-) - J144-7 (GND)

Y - BR

Sound signal (Rear left)

Audio system playing

A waveform synchronized with sound is output

J145-9 (RR+) - J144-7 (GND)

R - BR

Sound signal (Rear right)

Audio system playing

A waveform synchronized with sound is output

J145-10 (RR-) - J144-7 (GND)

W - BR

Sound signal (Rear right)

Audio system playing

A waveform synchronized with sound is output

J145-11 (WFR-) - J144-7 (GND)

G - BR

Sound signal (Rear right)

Audio system playing

A waveform synchronized with sound is output

J145-12 (WFL-) - J144-7 (GND)

BR - BR

Sound signal (Rear left)

Audio system playing

A waveform synchronized with sound is output

    System Diagram

    Touch Panel Switch does not Function

    See More:

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