Toyota Tacoma (2015-2018) Service Manual: Terminals Of Ecu

Toyota Tacoma (2015-2018) Service Manual / Door Lock / Smart Key System(for Entry Function) / 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.

(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.

(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: Engine switch off All doors closed Electrical key transmitter sub-assembly not inside vehicle 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)
C29-4 (CLG1) - C29-11 (E)	Output	G - W-B		Procedure: Engine switch off All doors closed Electrical key transmitter sub-assembly not inside vehicle All doors locked through wireless operation (electrical key transmitter sub-assembly brought outside detection area*2)	Pulse generation (See waveform 2)	Overhead + Driver Side (key diagnostic mode)
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: Engine switch off Electrical key transmitter sub-assembly brought outside vehicle All doors closed All doors locked through wireless operation (electrical key transmitter sub-assembly brought outside detection area*2) 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: Engine switch off Electrical key transmitter sub-assembly brought outside vehicle All doors locked Electrical key transmitter sub-assembly not near the vehicle 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: Engine switch off All doors closed Electrical key transmitter sub-assembly not inside vehicle 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)
C29-3 (CG1B) - C29-11 (E)	Output	SB - W-B		Procedure: Engine switch off All doors closed Electrical key transmitter sub-assembly not inside vehicle All doors locked through wireless operation (electrical key transmitter sub-assembly brought outside detection area*2)	Pulse generation (See waveform 4)	Overhead + Driver Side (key diagnostic mode)
C29-21 (CLG5) - C29-11 (E)	Output	LG - W-B	Output to No. 1 indoor electrical key antenna assembly (front floor)	Procedure: Engine switch off Electrical key transmitter sub-assembly not inside vehicle 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: Engine switch off Electrical key transmitter sub-assembly not inside vehicle 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: Engine switch off Electrical key transmitter sub-assembly not inside vehicle 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: Engine switch off Electrical key transmitter sub-assembly not inside vehicle 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: Engine switch off Electrical key transmitter sub-assembly brought outside detection area but kept inside wireless function operational area 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: Engine switch off Electrical key transmitter sub-assembly inside vehicle 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: Engine switch off 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: Engine switch off All doors locked Electrical key transmitter sub-assembly not inside vehicle Electrical key transmitter sub-assembly brought outside detection area but kept inside wireless function operational area 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:

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: Engine switch off All doors closed Electrical key transmitter sub-assembly not inside vehicle 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:

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: Engine switch off All doors closed Electrical key transmitter sub-assembly not inside vehicle 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: Engine switch off All doors closed Electrical key transmitter sub-assembly not inside vehicle 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: Engine switch off All doors closed Electrical key transmitter sub-assembly not inside vehicle 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:

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

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:

Engine switch off
Electrical key transmitter sub-assembly not inside vehicle
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:

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: Engine switch off Electrical key transmitter sub-assembly brought outside detection area but kept inside wireless function operational area 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:

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: Engine switch off All doors locked Electrical key transmitter sub-assembly not inside vehicle Electrical key transmitter sub-assembly brought outside detection area but kept inside wireless function operational area 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:

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: Engine switch off Electrical key transmitter sub-assembly brought outside vehicle All doors closed All doors locked through wireless operation (electrical key transmitter sub-assembly brought outside detection area*) 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:

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: Engine switch off Electrical key transmitter sub-assembly brought outside vehicle All doors locked Electrical key transmitter sub-assembly not near the vehicle 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

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
M6-6 (FLCY) - Body ground	Input	Y - Body ground	Front door courtesy light switch LH input	Front door LH closed	Pulse generation (See waveform 2)	FL Door Courtesy
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
M6-27 (FRCY) - Body ground	Input	LG - Body ground	Front door courtesy light switch RH input	Front door RH closed	Pulse generation (See waveform 2)	FR Door Courtesy
1H-36 (LCTY) - Body ground	Input	P - Body ground	Rear door courtesy light switch LH input1 Upper access panel lock assembly LH input2 Lower access panel lock assembly LH input*2	Rear door LH open	Below 1 V	RL Door Courtesy SW
1H-36 (LCTY) - Body ground	Input	P - Body ground		Rear door LH closed	Pulse generation (See waveform 2)	RL Door Courtesy SW
1D-30 (RCTY) - Body ground	Input	V - Body ground	Rear door courtesy light switch RH input1 Upper access panel lock assembly RH input2 Lower access panel lock assembly RH input*2	Rear door RH open	Below 1 V	RR Door Courtesy SW
1D-30 (RCTY) - Body ground	Input	V - Body ground		Rear door RH closed	Pulse generation (See waveform 2)	RR Door Courtesy SW
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	-
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 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	-
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 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	-
1D-2 (ACTD) - Body ground	Output	B - Body ground	Driver door lock motor unlock drive output	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	-
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 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	-
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 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
1D-11 (LSFL) - Body ground	Input	P - Body ground	Front door LH unlock detection switch input	Engine switch off, all doors closed and front door LH locked	Pulse generation (See waveform 1)	FL Door Lock Pos
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
1D-24 (LSFR) - Body ground	Input	GR - Body ground	Front door RH unlock detection switch input	Engine switch off, all doors closed and front door RH locked	Pulse generation (See waveform 1)	FR Door Lock Pos
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
1A-41 (LSR) - Body ground*1	Input	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 (See waveform 1)	RL-Door Lock Pos SW
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
1H-27 (LSR) - Body ground*1	Input	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 (See waveform 1)	RR-Door Lock Pos SW
1F-29 (BZR) - Body ground	Output	Y - Body ground	Wireless door lock buzzer signal	Wireless door lock buzzer off	Below 1 V
1F-29 (BZR) - Body ground	Output	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.

(e) Using an oscilloscope, check waveform 1.

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

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:

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

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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