Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Terminals Of Ecu

TERMINALS OF ECU

1. RADIO AND DISPLAY RECEIVER ASSEMBLY

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

R30-1 (FR+) - R30-7 (GND1)

LA-R - W-B

Sound signal (Front Right)

Audio system playing

A waveform synchronized with sounds is output

R30-2 (FL+) - R30-7 (GND1)

LA-B - W-B

Sound signal (Front Left)

Audio system playing

A waveform synchronized with sounds is output

R30-3 (ACC1) - R30-7 (GND1)

GR - W-B

Power source (ACC)

Ignition switch off

Below 1 V

Ignition switch ACC

11 to 14 V

R30-4 (+B1) - R30-7 (GND1)

W - W-B

Power source (+B)

Always

11 to 14 V

R30-5 (FR-) - R30-7 (GND1)

LA-G - W-B

Sound signal (Front Right)

Audio system playing

A waveform synchronized with sounds is output

R30-6 (FL-) - R30-7 (GND1)

LA-W - W-B

Sound signal (Front Left)

Audio system playing

A waveform synchronized with sounds is output

R30-7 (GND1) - Body ground

W-B - Body ground

Ground

Always

Below 1 V

R30-10 (ILL+) - R30-7 (GND1)

G - W-B

Illumination signal

Light control switch off

Below 1 V

Light control switch in tail or head position

11 to 14 V

R29-1 (RR+) - R30-7 (GND1)

L - W-B

Sound signal

(Rear Right)*2

Audio system playing

A waveform synchronized with sounds is output

R29-2 (RL+) - R30-7 (GND1)

W - W-B

Sound signal

(Rear Left)*2

Audio system playing

A waveform synchronized with sounds is output

R29-3 (RR-) - R30-7 (GND1)

LG - W-B

Sound signal

(Rear Right)*2

Audio system playing

A waveform synchronized with sounds is output

R29-5 (ILL-) - R30-7 (GND1)

BE - W-B

Illumination (rheostat) signal

Light control switch off and rheostat switch position medium

Below 1 V

Light control switch in tail or head position

Pulse generation

R29-6 (RL-) - R30-7 (GND1)

B - W-B

Sound signal

(Rear Right)*2

Audio system playing

A waveform synchronized with sounds is output

R31-1 (IG) - R30-7 (GND1)

LG - W-B

Power source (IG)

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V

R31-2 (REV) - R30-7 (GND1)

GR - W-B

Reverse signal

Ignition switch ON, shift lever not in R

Below 1 V

Ignition switch ON, shift lever in R

11 to 14 V

R31-4 (MACC) - R30-7 (GND1)

R - W-B

Microphone power supply

Ignition switch off

Below 1 V

Ignition switch ON

4 to 6 V

R31-5 (MIN+) - R30-7 (GND1)

G - W-B

Microphone voice signal

"Bluetooth" hands-free function on

A waveform synchronized with sounds is output

R31-6 (SNS2) - R30-7 (GND1)

W - W-B

Microphone connection detection signal

Always

Below 1 V

R31-9 (CANH)

V

CAN communication signal

-

-

R31-10 (CANL)

W

CAN communication signal

-

-

R31-11 (AGND) - Body ground

Shielded - Body ground

Shield ground

Always

Below 1 V

R31-15 (PKB) - R30-7 (GND1)

Y - W-B

Parking brake switch signal

Parking brake switch off

Below 1 V

Parking brake switch on

11 to 14 V

R31-18 (SGND) - Body ground

Shielded - Body ground

Shield ground

Always

Below 1 V

R31-19 (MIN-) - R30-7 (GND1)

B - W-B

Microphone voice signal

"Bluetooth" hands-free function on

A waveform synchronized with sounds is output

R31-17 (SPD) - R30-7 (GND1)

V - W-B

Vehicle Speed signal

Ignition switch ON

Wheel being rotated

Pulse generation

R31-21 (SW1) - R30-7 (GND1)*1

V - W-B

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

R31-22 (SW2) - R30-7 (GND1)*1

Y - W-B

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

R31-23 (SWG) - R30-7 (GND1)*1

SB - W-B

Steering pad switch ground

Always

Below 1 V

R31-25 (ADPG) - R30-7 (GND1)

W-B - W-B

External device connection detection signal

External device connected

Below 1 V

R31-26 (VAR+) - R30-7 (GND1)

W - W-B

Sound signal (Right)

External device playing (When stereo jack used)

A waveform synchronized with sounds is output

R31-27 (VA-) - R30-7 (GND1)

R - W-B

Ground

Always

Below 1 V

R31-28 (VAL+) - R30-7 (GND1)

B - W-B

Sound signal (Left)

External device playing (When stereo jack used)

A waveform synchronized with sounds is output

R32-3 (CNH1)

B

Local bus communication signal

-

-

R32-4 (CNL1)

W

Local bus communication signal

-

-

R32-24 (V-) - R30-7 (GND1)

W - W-B

Ground

Always

Below 1 V

R32-12 (V+) - R32-24 (V-)

R - W

Video signal

Ignition switch ON, shift lever in R

Pulse generation

(See waveform 1)

Ignition switch ON, shift lever in R, screen blacked out by covering camera lens

Pulse generation

(See waveform 2)

R32-23 (CGND) - Body ground

Shield - Body ground

Shield ground

Always

Below 1 V

R32-11 (CA+) - R30-7 (GND1)

B - W-B

Power source

Ignition switch ON, shift lever in R

5.5 to 7.05 V

R27-3 (ACC2) - R30-7 (GND1)*1

Y - W-B

Power source (ACC)

Ignition switch off

Below 1 V

Ignition switch ACC

11 to 14 V

R27-4 (+B2) - R30-7 (GND1)*1

R - W-B

Power source (+B)

Always

11 to 14 V

R27-8 (GND2) - Body ground*1

B - Body ground

Ground

Always

Below 1 V

R28-1 (UPO)

-

Power source

-

-

R28-2 (UDO-)

-

Data signal

-

-

R28-3 (UDO+)

-

Data signal

-

-

R28-4 (UESG)

-

Ground

-

-

R33-2 (US4-)*1

-

Data signal

-

-

R33-3 (US4+)*1

-

Data signal

-

-

R33-4 (UGO4)*1

-

Ground

-

-

R33-5 (USG4)*1

-

Shield ground

-

-

R34-1 (LVDS)*1

B

LVDS communication signal

-

-

RA-5 (ANT+) - R30-7 (GND1)

B - W-B

Power source of antenna

Ignition switch ACC

Radio switch on and AM or FM

11 to 14 V

  • *1: w/ SDARS System
  • *2: for 6 Speakers

(a) Using an oscilloscope, check the waveform.

(1) Waveform 1 (Reference)

(1) Waveform 1 (Reference)

Item

Content

Terminal No. (Symbol)

R32-12 (V+) - R32-24 (V-)

Tool Setting

200 mV/DIV., 50 μsec./DIV.

Condition

Ignition switch ON, shift lever in R

HINT:

The video waveform changes according to the image sent by the rear television camera assembly.

(2) Waveform 2 (Reference)

Item

Content

Terminal No. (Symbol)

R32-12 (V+) - R32-24 (V-)

Tool Setting

200 mV/DIV., 50 μsec./DIV.

Condition

Ignition switch ON, shift lever in R, screen blacked out by covering camera lens

HINT:

The video waveform changes according to the image sent by the rear television camera assembly.

Text in Illustration

*a

Waveform 1

*b

Waveform 2

*c

Synchronized Signal

*d

Video Waveform

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

S52-3 (ACC2) - S52-8 (GND2)

Y - B

Power source (ACC)

Ignition switch off

Below 1 V

Ignition switch ACC

11 to 14 V

S52-4 (+B2) - S52-8 (GND2)

R - B

Power source (+B)

Always

11 to 14 V

S52-8 (GND2) - Body ground

B - Body ground

Ground

Always

Below 1 V

S53-1 (USV4)

-

Power source

-

-

S53-2 (US4-)

-

Data signal

-

-

S53-3 (US4+)

-

Data signal

-

-

S53-4 (UGO4)

-

Ground

-

-

S53-5 (USG4)

B

Shield ground

-

-

S54-1 (LVDS)

-

LVDS communication signal

-

-

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