Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Terminals Of Ecu

TERMINALS OF ECU

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

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

Text in Illustration

*1

Main Body ECU (Multiplex Network Body ECU)

-

-

(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

MB-14 (TRLY) - Body ground

-

Supply battery to taillight relay drive

Always

11 to 14 V

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

(c) Reconnect the 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

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*1

Y - Body ground

Rear door RH unlock detection switch input

Rear door RH or LH unlocked

Below 1 V

1A-41 (LSR) - Body ground*1

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*1

L - Body ground

Rear door LH unlock detection switch input

Rear door LH or RH unlocked

Below 1 V

1H-27 (LSR) - Body ground*1

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

1D-31 (KSW) - Body ground*3

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

M6-15 (IND) - Body ground*3

V - Body ground

Security indicator illumination

Security indicator light illuminates

(It illuminates only for 57 seconds in alarm sounding state.)

3 to 10 V

1F-31 (SH) - Body ground

L - Body ground

Security horn drive

Security horn sounding

(Theft deterrent system is in alarm sounding state)

Pulse generation

(Below 1 V ← → 11 to 14 V)

1F-26 (HORN) - Body ground

L - Body ground

Vehicle horn drive

Vehicle horns sounding

(Theft deterrent system is in alarm sounding state)

Pulse generation

(Below 1 V ← → 11 to 14 V)

1F-28 (HRLY) - Body ground

W - Body ground

Headlight relay driver output

Headlight blinks

(Theft deterrent system is in alarm sounding state)

Pulse generation

(Below 1 V ← → 11 to 14 V)

1D-29 (ILE) - Body ground

BE - Body ground

Interior light driver output

Interior light illuminates

(Theft deterrent system is in alarm sounding state)

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

  • *1: for Double Cab
  • *2: for Access Cab
  • *3: w/o Smart Key System

If the result is not as specified, the main body ECU (multiplex network body ECU) may have a malfunction.

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