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

-

-

Problem Symptoms Table
PROBLEM SYMPTOMS TABLE NOTICE: After replacing the stereo component tuner assembly of vehicles subscribed to pay-type satellite radio broadcasts, XM radio ID registration is necessary (w/ SDARS ...

Dtc Check / Clear
DTC CHECK / CLEAR 1. CHECK DTC (CHECK USING TECHSTREAM) (a) Connect the Techstream to the DLC3. (b) Turn the ignition switch to ON. (c) Turn the Techstream on. (d) Enter the following menus: Body ...

Other materials:

Installation
INSTALLATION PROCEDURE 1. SET NO. 1 CYLINDER TO TDC/COMPRESSION 2. INSTALL CAMSHAFT TIMING GEAR BOLT NOTICE: There are different types of camshaft timing gear bolts. Make sure to check the identification mark to determine the tightening torque. *a Identification Ma ...

Diagnosis System
DIAGNOSIS SYSTEM 1. DESCRIPTION (a) Smart key system (for start function) data and the Diagnostic Trouble Codes (DTCs) can be read through the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use the Techstream to check for malfunctions and perform rep ...

On-vehicle Inspection
ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT SHIFT LEVER POSITION (a) When moving the shift lever from P to each position with the ignition switch ON and the brake pedal depressed, check that the shift lever moves smoothly and correctly into position. (b) Start the engine and check that the ve ...

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