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

Engine switch ACC

11 to 14 V

MB-30 (ACC) - Body ground

-

ACC power supply

Engine switch off

Below 1 V

MB-32 (IG) - Body ground

-

IG power supply

Engine switch ON

11 to 14 V

MB-32 (IG) - Body ground

-

IG power supply

Engine 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

1D-1 (ACT+) - Body ground

R - Body ground

Door lock motor unlock drive output (except driver door)

Door control switch (power window regulator master switch assembly) or driver door key cylinder off

Below 1 V

Door control switch (power window regulator master switch assembly) or driver door key cylinder unlocked

11 to 14 V

1H-12 (ACT+) - Body ground

LA-R - Body ground

Door lock motor unlock drive output (except driver door)

Door control switch (power window regulator master switch assembly) or driver door key cylinder off

Below 1 V

Door control switch (power window regulator master switch assembly) or driver door key cylinder unlocked

11 to 14 V

1H-10 (ACT-) - Body ground

LA-G - Body ground

Door lock motor lock drive output (all doors)

Door control switch (power window regulator master switch assembly) or driver door key cylinder off

Below 1 V

Door control switch (power window regulator master switch assembly) or driver door key cylinder locked

11 to 14 V

1D-3 (ACT-) - Body ground

G - Body ground

Door lock motor lock drive output (all doors)

Door control switch (power window regulator master switch assembly) or driver door key cylinder off

Below 1 V

Door control switch (power window regulator master switch assembly) 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 (power window regulator master switch assembly) or driver door key cylinder off

Below 1 V

Door control switch (power window regulator master switch assembly) or driver door key cylinder unlocked

11 to 14 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

Engine 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

Engine 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

Engine 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

Engine 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

  • *1: for Double Cab
  • *2: for Access Cab

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

2. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Disconnect the C27 and C29 certification ECU (smart key ECU assembly) connector.

(a) Disconnect the C27 and C29 certification ECU (smart key ECU assembly) connector.

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

HINT:

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

Tester Connection

Wiring Color

Terminal Description

Condition

Specified Condition

C29-11 (E) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

C29-10 (+B) - Body ground

P - Body ground

Battery power supply

Always

11 to 14 V

C27-4 (CUTB) - Body ground

GR - Body ground

Dark current cut fuse pin input signal

Always

11 to 14 V

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

(c) Reconnect the C27 and C29 certification ECU (smart key ECU assembly) connector.

(d) Measure the voltage according to the value(s) in the table below.

Tester Connection

Wiring Color

Terminal Description

Condition

Specified Condition

C27-3 (IG1D) - C29-11 (E)

B - W-B

IG power supply

Engine switch on (IG)

11 to 14 V

Engine switch off

Below 1 V

C28-19 (CSEL) - C29-11 (E)

SB - W-B

Communication channel switching circuit

Engine switch off, all doors closed and electrical key transmitter sub-assembly switch not pressed → electrical key transmitter sub-assembly switch pressed → electrical key transmitter sub-assembly switch released

Below 1 V → 4.5 to 6.0 V → Below 1 V

C28-20 (RDAM) - C29-11 (E)

G - W-B

RF Signal input circuit

Engine switch off

11 to 14 V pulse generation at regular intervals

C28-18 (RCO) - C29-11 (E)

L - W-B

Wireless tuner power supply output circuit

Engine switch off, all doors closed and electrical key transmitter sub-assembly switch not pressed → electrical key transmitter sub-assembly switch pressed

Below 1 V → 4.5 to 5.5 V

If the result is not as specified, the certification ECU (smart key ECU assembly) may have a malfunction.

3. CHECK DOOR CONTROL RECEIVER

(a) Disconnect the T24 door control receiver connector.

(a) Disconnect the T24 door control receiver connector.

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

HINT:

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

Tester Connection

Wiring Color

Terminal Description

Condition

Specified Condition

T24-7 (+B) - Body ground

BE - Body ground

Battery (power supply)

Always

10 to 16 V

T24-12 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

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

(c) Reconnect the T24 door control receiver connector.

(d) Measure the voltage according to the value(s) in the table below.

Tester Connection

Wiring Color

Terminal Description

Condition

Specified Condition

T24-6 (CSEL) - T24-12 (GND)

SB - W-B

Smart system receiving channel switching signal input

Engine switch off, all doors closed and electrical key transmitter sub-assembly switch not pressed → electrical key transmitter sub-assembly switch pressed → electrical key transmitter sub-assembly switch released

Below 1 V → 4.5 to 6.0 V → Below 1 V

T24-2 (DATA) - T24-12 (GND)

G - W-B

Smart system recovery code output

Engine switch off, all doors closed and electrical key transmitter sub-assembly switch not pressed → electrical key transmitter sub-assembly switch pressed → electrical key transmitter sub-assembly switch released

Below 1 V → 10 to 16 V → Below 1 V

T24-8 (+5) - T24-12 (GND)

L - W-B

Receive mode switching signal input

Engine switch off, all doors closed and electrical key transmitter sub-assembly switch not pressed → electrical key transmitter sub-assembly switch pressed

Below 1 V → 4.5 to 5.5 V

If the result is not as specified, the certification ECU (smart key ECU assembly) may have a malfunction.

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