Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Terminals Of Ecu

TERMINALS OF ECU

1. CHECK DRIVER SIDE JUNCTION BLOCK AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

(a) Disconnect the MB main body ECU (multiplex network body ECU) connectors.

(a) Disconnect the MB main body ECU (multiplex network body ECU) connectors.

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

HINT:

Measure the values on the wire harness side with the connectors disconnected.

Tester Connection

Wiring Color

Terminal Description

Condition

Specified Condition

MB-11(GND1) - Body ground

-

Ground

Always

Below 1 Ω

MB-31 (BECU) - Body ground

-

Battery power supply

Always

11 to 14 V

MB-30 (ACC) - Body ground

-

ACC power supply

Ignition switch ACC

11 to 14 V

MB-30 (ACC) - Body ground

-

ACC power supply

Ignition switch off

Below 1 V

MB-32 (IG) - Body ground

-

IG power supply

Ignition switch ON

11 to 14 V

MB-32 (IG) - Body ground

-

IG power supply

Ignition switch off

Below 1 V

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

(c) Reconnect the MB main body ECU (multiplex network body ECU) connectors.

(d) Measure the voltage and check for pulses according to the value(s) in the table below.

Tester Connection

Wiring Color

Terminal Description

Condition

Specified Condition

1H-10 (ACT-) - Body ground

LA-G - Body ground

Door lock motor unlock drive output (except driver door)

Door control switch or driver door key cylinder off

Below 1 V

Door control switch or driver door key cylinder unlocked

11 to 14 V

1D-3 (ACT-) - Body ground

G - Body ground

Door lock motor unlock drive output (except driver door)

Door control switch or driver door key cylinder off

Below 1 V

Door control switch or driver door key cylinder unlocked

11 to 14 V

1D-1 (ACT+) - Body ground

R - Body ground

Door lock motor lock drive output (all doors)

Door control switch or driver door key cylinder off

Below 1 V

Door control switch or driver door key cylinder locked

11 to 14 V

1H-12 (ACT+) - Body ground

LA-R - Body ground

Door lock motor lock drive output (all doors)

Door control switch or driver door key cylinder off

Below 1 V

Door control switch or driver door key cylinder locked

11 to 14 V

1D-2 (ACTD) - Body ground

B - Body ground

Driver door lock motor unlock drive output

Door control switch or driver door key cylinder off

Below 1 V

Door control switch or driver door key cylinder unlocked

11 to 14 V

M6-2 (UL3) - Body ground

G - Body ground

Driver door key-linked unlock input

Driver door key cylinder turned to neutral position → on (unlock)

Pulse generation → Below 1 V

M6-29 (L2) - Body ground

SB - Body ground

Driver door key-linked lock input

Driver door key cylinder turned to neutral position → on (lock)

Pulse generation → Below 1 V

M6-27 (FRCY) - Body ground

LG - Body ground

Front door courtesy light switch RH input

Front door RH open

Below 1 V

M6-27 (FRCY) - Body ground

LG - Body ground

Front door courtesy light switch RH input

Front door RH open

11 to 14 V

M6-6 (FLCY) - Body ground

Y - Body ground

Front door courtesy light switch LH input

Front door LH open

Below 1 V

M6-6 (FLCY) - Body ground

Y - Body ground

Front door courtesy light switch LH input

Front door LH closed

11 to 14 V

1H-36 (LCTY) - Body ground

P - Body ground

Rear door courtesy light switch LH input*1

Upper access panel lock assembly LH input*2

Lower access panel lock assembly LH input*2

Rear door LH open

Below 1 V

1H-36 (LCTY) - Body ground

P - Body ground

Rear door courtesy light switch LH input*1

Upper access panel lock assembly LH input*2

Lower access panel lock assembly LH input*2

Rear door LH closed

Pulse generation

1D-30 (RCTY) - Body ground

V - Body ground

Rear door courtesy light switch RH input*1

Upper access panel lock assembly RH input*2

Lower access panel lock assembly RH input*2

Rear door RH open

Below 1 V

1D-30 (RCTY) - Body ground

V - Body ground

Rear door courtesy light switch RH input*1

Upper access panel lock assembly RH input*2

Lower access panel lock assembly RH input*2

Rear door RH closed

Pulse generation

1D-11 (LSFL) - Body ground

P - Body ground

Front door LH unlock detection switch input

Front door LH unlocked

Below 1 V

1D-11 (LSFL) - Body ground

P - Body ground

Front door LH unlock detection switch input

Ignition switch off, all doors closed and front door LH locked

Pulse generation

1D-24 (LSFR) - Body ground

GR - Body ground

Front door RH unlock detection switch input

Front door RH unlocked

Below 1 V

1D-24 (LSFR) - Body ground

GR - Body ground

Front door RH unlock detection switch input

Ignition switch off, all doors closed and front door RH locked

Pulse generation

1A-41 (LSR) - Body ground

Y - Body ground

Rear door RH unlock detection switch input

Rear door RH or LH unlocked

Below 1 V

1A-41 (LSR) - Body ground

Y - Body ground

Rear door RH unlock detection switch input

Ignition switch off, all doors closed and rear door RH and LH locked

Pulse generation

1H-27 (LSR) - Body ground

L - Body ground

Rear door LH unlock detection switch input

Rear door LH or RH unlocked

Below 1 V

1H-27 (LSR) - Body ground

L - Body ground

Rear door LH unlock detection switch input

Ignition switch off, all doors closed and rear door LH and RH locked

Pulse generation

1F-29 (BZR) - Body ground

Y - Body ground

Wireless door lock buzzer signal

Wireless door lock buzzer off

Below 1 V

1F-29 (BZR) - Body ground

Y - Body ground

Wireless door lock buzzer signal

Wireless door lock buzzer on

Pulse generation

31-1D (KSW) - Body ground*5

G - Body ground

Key unlock warning switch input

Key in ignition key cylinder

Below 1 V

No key in ignition key cylinder

11 to 14 V or Pulse generation

  • *1: for Double Cab
  • *2: for Access Cab
  • *3: w/ Jam Protection
  • *4: w/o Jam Protection
  • *5: w/o Smart Key System
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in o ...

All Doors LOCK/UNLOCK Functions do not Operate Via Door Control Switch or Door Key Cylinder
DESCRIPTION The main body ECU (multiplex network body ECU) receives switch signals from the power window regulator master switch assembly and driver door key cylinder lock or unlock switch signal ...

Other materials:

Main Body ECU Communication Stop Mode
DESCRIPTION Detection Item Symptom Trouble Area Main Body ECU Communication Stop Mode Either condition is met: Communication stop for "Main Body" is indicated on the "Communication Bus Check" screen ...

Engine Control System Malfunction (C1201)
DESCRIPTION If a malfunction in the engine control system is detected, VSC and TRAC operations are prohibited by the fail-safe function. DTC No. Detection Item DTC Detection Condition Trouble Area C1201 Engine Control System ...

Steering Angle Sensor Internal Circuit (C1433)
DESCRIPTION The skid control ECU (brake actuator assembly) outputs this DTC when it receives an internal malfunction signal from the steering angle sensor. DTC No. Detection Item DTC Detection Condition Trouble Area C1433 St ...

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