Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Terminals Of Ecu

TERMINALS OF ECU

1. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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

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

Tester Connection

Input/ Output

Wiring Color

Terminal Description

Condition

Specified Condition

Related Data List Item

C29-11 (E) - Body ground

-

W-B - Body ground

Ground

Always

Below 1 Ω

-

C29-10 (+B) - C29- 11 (E)

Input

P - W-B

+B power supply

Always

11 to 14 V

-

C27-4 (CUTB) - C29-11 (E)

Input

GR - W-B

Dark current cut pin*

Always

11 to 14 V

-

*: In order to prevent the vehicle battery from being depleted when the vehicle is shipped long distances, a fuse that cuts unnecessary electrical load while the vehicle is being shipped is set in the circuit. If the fuse is removed, the circuit becomes open. If the fuse that is between the vehicle battery and terminal CUTB is removed and the circuit is open, the certification ECU (smart key ECU assembly) changes to a certain control mode (example: the transmission of electric waves every 0.25 seconds. that form the detection area stops).

If the result is not as specified, there may be a malfunction on the wire harness side or the fuse is removed.

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

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

Tester Connection

Input/ Output

Wiring Color

Terminal Description

Condition

Specified Condition

Related Data List Item

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

Input

B - W-B

IG power supply

Engine switch off → on (IG)

Below 1 V → 11 to 14 V

Engine Switch

C29-4 (CLG1) - C29-11 (E)

Output

G - W-B

Output to driver door electrical key antenna

(request signal (challenge) is sent to door electrical key antenna from certification ECU (smart key ECU assembly) to form detection area)

Procedure:

  1. Engine switch off
  2. All doors closed
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. All doors locked through wireless operation (electrical key transmitter sub-assembly brought inside detection area*2)

Pulse generation

(See waveform 1)

Overhead + Driver Side (key diagnostic mode)

Procedure:

  1. Engine switch off
  2. All doors closed
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. All doors locked through wireless operation (electrical key transmitter sub-assembly brought outside detection area*2)

Pulse generation

(See waveform 2)

C29-4 (CLG1) - C29-11 (E)

Input

G - W-B

Input to driver door lock sensor

(front door outside handle assembly LH lock sensor on signal is sent to the certification ECU (smart key ECU assembly))

Procedure:

  1. Engine switch off
  2. Electrical key transmitter sub-assembly brought outside vehicle
  3. All doors closed
  4. All doors locked through wireless operation (electrical key transmitter sub-assembly brought outside detection area*2)
  5. Driver door lock sensor touched

Pulse generation

(See waveform 8)

D-Door Trigger Switch

C29-4 (CLG1) - C29-11 (E)

Input

G - W-B

Input to driver door unlock sensor

(when system is in unlock standby mode and unlock sensor is touched, door electrical key antenna sends unlock sensor input signal (sensing) to certification ECU (smart key ECU assembly))

Procedure:

  1. Engine switch off
  2. Electrical key transmitter sub-assembly brought outside vehicle
  3. All doors locked
  4. Electrical key transmitter sub-assembly not near the vehicle
  5. Driver door unlock sensor touched

Pulse generation

(See waveform 9)

D-Door Touch Sensor

C29-3 (CG1B) - C29-11 (E)

Output

SB - W-B

Output to driver door electrical key antenna (terminal on opposite side of component from CLG1 output terminal)

Procedure:

  1. Engine switch off
  2. All doors closed
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. All doors locked through wireless operation (electrical key transmitter sub-assembly brought inside detection area*2)

Pulse generation

(See waveform 3)

Overhead + Driver Side (key diagnostic mode)

Procedure:

  1. Engine switch off
  2. All doors closed
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. All doors locked through wireless operation (electrical key transmitter sub-assembly brought outside detection area*2)

Pulse generation

(See waveform 4)

C29-21 (CLG5) - C29-11 (E)

Output

LG - W-B

Output to No. 1 indoor electrical key antenna assembly (front floor)

Procedure:

  1. Engine switch off
  2. Electrical key transmitter sub-assembly not inside vehicle
  3. Within 30 seconds of closing any door using the door outside handle

Pulse generation

(See waveform 5)

Overhead + Front Room (key diagnostic mode)

C29-20 (CG5B) - C29-11 (E)

Output

P - W-B

Output to No. 1 indoor electrical key antenna assembly (front floor) (terminal on opposite side of component from CLG5 output terminal)

Procedure:

  1. Engine switch off
  2. Electrical key transmitter sub-assembly not inside vehicle
  3. Within 30 seconds of closing any door using the door outside handle

Pulse generation

(See waveform 5)

Overhead + Front Room (key diagnostic mode)

C28-15 (CLG6) - C29-11 (E)

Output

BE - W-B

Output to No. 2 indoor electrical key antenna assembly (rear floor)

Procedure:

  1. Engine switch off
  2. Electrical key transmitter sub-assembly not inside vehicle
  3. Within 30 seconds of closing any door using the door outside handle

Pulse generation

(See waveform 5)

Overhead + Rear Room (key diagnostic mode)

C28-14 (CG6B) - C29-11 (E)

Output

GR - W-B

Output to No. 2 indoor electrical key antenna assembly (rear floor) (terminal on opposite side of component from CLG6 output terminal)

Proceed:

  1. Engine switch off
  2. Electrical key transmitter sub-assembly not inside vehicle
  3. Within 30 seconds of closing any door using the door outside handle

Pulse generation

(See waveform 5)

Overhead + Rear Room (key diagnostic mode)

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

Output

L - W-B

Output to door control and tire pressure monitoring system receiver assembly (Power supply for electrical key and TPMS receiver assembly. Certification ECU (smart key ECU assembly) outputs 5 V when receiver starts operating.)

Procedure:

  1. Engine switch off
  2. Electrical key transmitter sub-assembly brought outside detection area but kept inside wireless function operational area
  3. Lock or unlock switch of electrical key transmitter sub-assembly not pressed → pressed

Pulse generation

(See waveform 6)

-

C28-21 (ASEL) - C29-11 (E)*1

Output

Y - W-B

Wireless charging system stop signal output

Proceed:

  1. Engine switch off
  2. Electrical key transmitter sub-assembly inside vehicle
  3. Turn the engine switch on (ACC)

Below 1 V → 4.5 to 6 V

(within 1 second of engine switch turned on (ACC))

-

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

Output

SB - W-B

Communication channel switching circuit

Proceed:

  1. Engine switch off
  2. All doors closed

Below 1 V → pulse generation

-

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

Input

G - W-B

Electrical key and TPMS receiver assembly verifies data received from electrical key transmitter sub-assembly.

Electrical key and TPMS receiver assembly sends data from electrical key transmitter sub-assembly to certification ECU (smart key ECU assembly) (Door control and tire pressure monitoring system receiver assembly intermittently grounds 12 V signal from certification ECU (smart key ECU assembly)).

Proceed:

  1. Engine switch off
  2. All doors locked
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. Electrical key transmitter sub-assembly brought outside detection area but kept inside wireless function operational area
  5. Lock or unlock switch of electrical key transmitter sub-assembly not pressed → pressed

Pulse generation

(See waveform 7)

-

  • *1: w/ Wireless Charging System
  • *2: For details about the entry function detection area, refer to Operation Check (See page ).

(e) Using an oscilloscope, check waveform 1.

NOTICE:

NOTICE:

The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

Waveform 1 (Reference)

Item

Content

Tester Connection

C29-4 (CLG1) - C29-11 (E)

Tool Setting

5 V/DIV., 500 ms./DIV.

Condition

Procedure:

  1. Engine switch off
  2. All doors closed
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. All doors locked through wireless operation

    (electrical key transmitter sub-assembly brought inside detection area*)

  • *: For details about the entry function detection area, refer to Operation Check (See page ).

(f) Using an oscilloscope, check waveform 2.

NOTICE:

NOTICE:

The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

Waveform 2 (Reference)

Item

Content

Tester Connection

C29-4 (CLG1) - C29-11 (E)

Tool Setting

5 V/DIV., 100 ms./DIV.

Condition

Procedure:

  1. Engine switch off
  2. All doors closed
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. All doors locked through wireless operation

    (electrical key transmitter sub-assembly brought outside detection area*)

  • *: For details about the entry function detection area, refer to Operation Check (See page ).

(g) Using an oscilloscope, check waveform 3.

NOTICE:

The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

Waveform 3 (Reference)

Item

Content

Tester Connection

C29-3 (CG1B) - C29-11 (E)

Tool Setting

5 V/DIV., 500 ms./DIV.

Condition

Procedure:

  1. Engine switch off
  2. All doors closed
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. All doors locked through wireless operation

    (electrical key transmitter sub-assembly brought inside detection area*)

  • *: For details about the entry function detection area, refer to Operation Check (See page ).

(h) Using an oscilloscope, check waveform 4.

NOTICE:

The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

Waveform 4 (Reference)

Item

Content

Tester Connection

C29-3 (CG1B) - C29-11 (E)

Tool Setting

5 V/DIV., 100 ms./DIV.

Condition

Procedure:

  1. Engine switch off
  2. All doors closed
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. All doors locked through wireless operation

    (electrical key transmitter sub-assembly brought outside detection area*)

  • *: For details about the entry function detection area, refer to Operation Check (See page ).

(i) Using an oscilloscope, check waveform 5.

NOTICE:

NOTICE:

The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

Waveform 5 (Reference)

Item

Content

Tester Connection

C29-21 (CLG5) - C29-11 (E)

C29-20 (CG5B) - C29-11 (E)

Tool Setting

2 V/DIV., 500 ms./DIV.

Condition

Procedure:

  1. Engine switch off
  2. Electrical key transmitter sub-assembly not inside vehicle
  3. Within 30 seconds of closing any door using the door outside handle
Text in Illustration

*a

For 30 seconds after closing any door using the door outside handle

*b

30 seconds or more have elapsed after closing any door using the door outside handle

(j) Using an oscilloscope, check waveform 6.

NOTICE:

NOTICE:

The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

Waveform 6 (Reference)

Item

Content

Tester Connection

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

Tool Setting

2 V/DIV., 500 ms./DIV.

Condition

Procedure:

  1. Engine switch off
  2. Electrical key transmitter sub-assembly brought outside detection area but kept inside wireless function operational area
  3. Lock or unlock switch of electrical key transmitter sub-assembly not pressed → pressed
Text in Illustration

*a

Before lock or unlock switch of electrical key transmitter sub-assembly pressed

*b

After lock or unlock switch of electrical key transmitter sub-assembly pressed

(k) Using an oscilloscope, check waveform 7.

NOTICE:

NOTICE:

The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

Waveform 7 (Reference)

Item

Content

Tester Connection

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

Tool Setting

5 V/DIV., 500 ms./DIV.

Condition

Proceed:

  1. Engine switch off
  2. All doors locked
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. Electrical key transmitter sub-assembly brought outside detection area but kept inside wireless function operational area
  5. Lock or unlock switch of electrical key transmitter sub-assembly not pressed → pressed
Text in Illustration

*a

Before lock or unlock switch of electrical key transmitter sub-assembly pressed

*b

After lock or unlock switch of electrical key transmitter sub-assembly pressed

(l) Using an oscilloscope, check waveform 8.

NOTICE:

NOTICE:

The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

Waveform 8 (Reference)

Item

Content

Tester Connection

C29-4 (CLG1) - C29-11 (E)

Tool Setting

5 V/DIV., 40 ms./DIV.

Condition

Proceed:

  1. Engine switch off
  2. Electrical key transmitter sub-assembly brought outside vehicle
  3. All doors closed
  4. All doors locked through wireless operation (electrical key transmitter sub-assembly brought outside detection area*)
  5. Lock sensor not touched → touched
  • *1: For details about the entry function detection area, refer to Operation Check (See page ).
Text in Illustration

*a

Lock sensor not touched

*b

Lock sensor touched

(m) Using an oscilloscope, check waveform 9.

NOTICE:

NOTICE:

The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

Waveform 9 (Reference)

Item

Content

Tester Connection

C29-4 (CLG1) - C29-11 (E)

Tool Setting

5 V/DIV., 40 ms./DIV.

Condition

Proceed:

  1. Engine switch off
  2. Electrical key transmitter sub-assembly brought outside vehicle
  3. All doors locked
  4. Electrical key transmitter sub-assembly not near the vehicle
  5. Unlock sensor not touched → touched
Text in Illustration

*a

Unlock sensor not touched

*b

Unlock sensor touched

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

Text in Illustration

*1

Main Body ECU (Multiplex Network Body ECU)

-

-

(a) Remove the main body ECU (multiplex network body ECU) from the driver side junction block (See page (b) Measure the voltage and resistance according to the value(s) in the table ).

(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 connector disconnected.

Tester Connection

Input/ Output

Wiring Color

Terminal Description

Condition

Specified Condition

Related Data List Item

MB-11 (GND1) - Body ground

-

-

Ground

Always

Below 1 Ω

-

MB-31 (BECU) - Body ground

Input

-

Battery power supply (for CPU)

Always

11 to 14 V

-

MB-30 (ACC) - Body ground

Input

-

ACC power supply

Engine switch on (ACC)

11 to 14 V

ACC SW

MB-32 (IG) - Body ground

Input

-

IG power supply

Engine switch on (IG)

11 to 14 V

IG SW

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

(c) Install the main body ECU (multiplex network body ECU) to the driver side junction block (See page (d) Measure the voltage according to the value(s) in the table below. ).

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

Tester Connection

Input/ Output

Wiring Color

Terminal Description

Condition

Specified Condition

Related Data List Item

M6-6 (FLCY) - Body ground

Input

Y - Body ground

Front door courtesy light switch LH input

Front door LH open

Below 1 V

FL Door Courtesy

Front door LH closed

Pulse generation

(See waveform 2)

M6-27 (FRCY) - Body ground

Input

LG - Body ground

Front door courtesy light switch RH input

Front door RH open

Below 1 V

FR Door Courtesy

Front door RH closed

Pulse generation

(See waveform 2)

1H-36 (LCTY) - Body ground

Input

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

RL Door Courtesy SW

Rear door LH closed

Pulse generation

(See waveform 2)

1D-30 (RCTY) - Body ground

Input

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

RR Door Courtesy SW

Rear door RH closed

Pulse generation

(See waveform 2)

M6-29 (L2) - Body ground

Input

SB - Body ground

Driver door key-linked lock input

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

Pulse generation → Below 1 V

(See waveform 1)

Door key SW-Lock

M6-2 (UL3) - Body ground

Input

G - Body ground

Driver door key-linked unlock input

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

Pulse generation → Below 1 V

(See waveform 1)

D Door key SW-UL

1D-1 (ACT+) - Body ground

Output

R - 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

1H-12 (ACT+) - Body ground

Output

LA-R - 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-2 (ACTD) - Body ground

Output

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

1H-10 (ACT-) - Body ground

Output

LA-G - 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-3 (ACT-) - Body ground

Output

G - 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-11 (LSFL) - Body ground

Input

P - Body ground

Front door LH unlock detection switch input

Front door LH unlocked

Below 1 V

FL Door Lock Pos

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

Pulse generation

(See waveform 1)

1D-24 (LSFR) - Body ground

Input

GR - Body ground

Front door RH unlock detection switch input

Front door RH unlocked

Below 1 V

FR Door Lock Pos

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

Pulse generation

(See waveform 1)

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

Input

Y - Body ground

Rear door RH unlock detection switch input

Rear door RH or LH unlocked

Below 1 V

RL-Door Lock Pos SW

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

Pulse generation

(See waveform 1)

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

Input

L - Body ground

Rear door LH unlock detection switch input

Rear door LH or RH unlocked

Below 1 V

RR-Door Lock Pos SW

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

Pulse generation

(See waveform 1)

1F-29 (BZR) - Body ground

Output

Y - Body ground

Wireless door lock buzzer signal

Wireless door lock buzzer off

Below 1 V

 

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.

(e) Using an oscilloscope, check waveform 1.

NOTICE:

NOTICE:

The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

Waveform 1 (Reference)

Item

Content

Tester Connection

1D-11 (LSFL) - Body ground

1D-24 (LSFR) - Body ground

1A-41 (LSR) - Body ground

1H-27 (LSR) - Body ground

M6-29 (L2) - Body ground

M6-2 (UL3) - Body ground

Tool Setting

2 V/DIV., 200 ms./DIV.

Condition

Door locked → unlocked

Text in Illustration

*a

Door locked

*b

Door unlocked

(f) Using an oscilloscope, check waveform 2.

NOTICE:

NOTICE:

The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

Waveform 2 (Reference)

Item

Content

Tester Connection

M6-6 (FLCY) - Body ground

M6-27 (FRCY) - Body ground

1H-36 (LCTY) - Body ground

1D-30 (RCTY) - Body ground

Tool Setting

2 V/DIV., 200 ms./DIV.

Condition

Door closed → opened

Text in Illustration

*a

Door closed

*b

Door open

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