Toyota 4Runner: Terminals Of Ecu

Toyota 4Runner Service Manual / Vehicle Interior / Door Lock / Wireless Door Lock Control System(w/ Smart Key System) / Terminals Of Ecu

TERMINALS OF ECU

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

(a) Remove the main body ECU (multiplex network body ECU) (See page ).

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
A-30 (BECU) - Body ground	-	Battery power supply	Always	11 to 14 V
A-31 (ALTB) - Body ground	-	Battery power supply	Always	11 to 14 V
A-32 (IG) - Body ground	-	Engine switch power supply	Engine switch on (IG)	11 to 14 V
A-32 (IG) - Body ground	-	Engine switch power supply	Engine switch off	Below 1 V
A-29 (ACC) - Body ground	-	ACC power supply	Engine switch on (ACC)	11 to 14 V
A-29 (ACC) - Body ground	-	ACC power supply	Engine switch off	Below 1 V
A-11 (GND1) - Body ground	-	Ground	Always	Below 1 Ω
F10-3 (GND2) - 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.

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
2F-27 (FLCY) - Body ground	R - Body ground	Front door LH courtesy switch input	Front door LH open	Below 1 V
2F-27 (FLCY) - Body ground	R - Body ground	Front door LH courtesy switch input	Front door LH closed	11 to 14 V
2B-15 (FRCY) - Body ground	B - Body ground	Front door RH courtesy switch input	Front door RH open	Below 1 V
2B-15 (FRCY) - Body ground	B - Body ground	Front door RH courtesy switch input	Front door RH closed	11 to 14 V
F8-3 (LCTY) - Body ground	V - Body ground	Rear door LH courtesy light switch input	Rear door LH open	Below 1 V
F8-3 (LCTY) - Body ground	V - Body ground	Rear door LH courtesy light switch input	Rear door LH closed	11 to 14 V
F10-27 (RCTY) - Body ground	R - Body ground	Rear door RH courtesy light switch input	Rear door RH open	Below 1 V
F10-27 (RCTY) - Body ground	R - Body ground	Rear door RH courtesy light switch input	Rear door RH closed	11 to 14 V
F9-7 (LSFL) - Body ground	G - Body ground	Front door LH lock position switch input	Front door LH unlocked	Below 1 V
F9-7 (LSFL) - Body ground	G - Body ground	Front door LH lock position switch input	Engine switch off, all doors closed and front door LH locked	Pulse generation (see waveform 1 or 2)
F9-18 (LSFR) - Body ground	G - Body ground	Front door RH lock position switch input	Front door RH unlocked	Below 1 V
F9-18 (LSFR) - Body ground	G - Body ground	Front door RH lock position switch input	Engine switch off, all doors closed and front door RH locked	Pulse generation (see waveform 3 or 4)
2F-25 (LSWL) - Body ground	V - Body ground	Rear door LH lock position switch input	Rear door LH unlocked	Below 1 V
2F-25 (LSWL) - Body ground	V - Body ground	Rear door LH lock position switch input	Engine switch off, all doors closed and rear door LH locked	Pulse generation (see waveform 5 or 6)
F10-2 (LSWR) - Body ground	V - Body ground	Rear door RH lock position switch input	Rear door RH unlocked	Below 1 V
F10-2 (LSWR) - Body ground	V - Body ground	Rear door RH lock position switch input	Engine switch off, all doors closed and rear door RH locked	Pulse generation (see waveform 7 or 8)
2D-13 (BZR) - Body ground	GR - Body ground	Wireless door lock buzzer signal	Wireless door lock buzzer off	Below 1 V
2D-13 (BZR) - Body ground	GR - Body ground	Wireless door lock buzzer signal	Wireless door lock buzzer on	11 to 14 V
F9-3 (HAZ) - Body ground	W - Body ground	Hazard warning signal light signal output	Hazard warning signal switch off	Below 1 V
F9-3 (HAZ) - Body ground	W - Body ground	Hazard warning signal light signal output	Hazard warning signal switch on	11 to 14 V

If the result is not as specified, the main body ECU (multiplex network body ECU) or driver side junction block assembly may have a malfunction.

(e) Using an oscilloscope, check waveform 1.

Waveform 1 (Reference)

Item	Content
Terminal No. (Symbol)	F9-7 (LSFL) - Body ground
Tool Setting	5 V/DIV., 20 ms/DIV.
Condition	Ignition switch off, all doors closed and front door LH locked

(f) Using an oscilloscope, check waveform 2.

Waveform 2 (Reference)

Item	Content
Terminal No. (Symbol)	F9-7 (LSFL) - Body ground
Tool Setting	5 V/DIV., 20 ms/DIV.
Condition	Ignition switch off, all doors closed and front door LH locked

(g) Using an oscilloscope, check waveform 3.

Waveform 3 (Reference)

Item	Content
Terminal No. (Symbol)	F9-18 (LSFR) - Body ground
Tool Setting	5 V/DIV., 20 ms/DIV.
Condition	Ignition switch off, all doors closed and front door RH locked

(h) Using an oscilloscope, check waveform 4.

Waveform 4 (Reference)

Item	Content
Terminal No. (Symbol)	F9-18 (LSFR) - Body ground
Tool Setting	5 V/DIV., 20 ms/DIV.
Condition	Ignition switch off, all doors closed and front door RH locked

(i) Using an oscilloscope, check waveform 5.

Waveform 5 (Reference)

Item	Content
Terminal No. (Symbol)	2F-25 (LSWL) - Body ground
Tool Setting	5 V/DIV., 20 ms/DIV.
Condition	Ignition switch off, all doors closed and rear door LH locked

(j) Using an oscilloscope, check waveform 6.

Waveform 6 (Reference)

Item	Content
Terminal No. (Symbol)	2F-25 (LSWL) - Body ground
Tool Setting	5 V/DIV., 20 ms/DIV.
Condition	Ignition switch off, all doors closed and rear door LH locked

(k) Using an oscilloscope, check waveform 7.

Waveform 7 (Reference)

Item	Content
Terminal No. (Symbol)	F10-2 (LSWR) - Body ground
Tool Setting	5 V/DIV., 20 ms/DIV.
Condition	Ignition switch off, all doors closed and rear door RH locked

(l) Using an oscilloscope, check waveform 8.

Waveform 8 (Reference)

Item	Content
Terminal No. (Symbol)	F10-2 (LSWR) - Body ground
Tool Setting	5 V/DIV., 20 ms/DIV.
Condition	Ignition switch off, all doors closed and rear door RH locked

2. CHECK MULTIPLEX NETWORK DOOR ECU (BACK DOOR P/W)

(a) Disconnect the V2 multiplex network door ECU (back door P/W) connector.

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
V2-1 (BDR) - Body ground	B - Body ground	Battery power supply	Always	11 to 14 V
V2-7 (BECU) - Body ground	L - Body ground	Battery power supply	Always	11 to 14 V
V2-8 (SIG) - Body ground	G - Body ground	Engine switch power supply	Engine switch on (IG)	11 to 14 V
V2-8 (SIG) - Body ground	G - Body ground	Engine switch power supply	Engine switch off	Below 1 V
V2-6 (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.

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
W10-10 (BDCY) - W10-18 (CTYE)	P - G	Back door courtesy switch input	Back door closed	Pulse generation (see waveform 1 or 2)
W10-10 (BDCY) - W10-18 (CTYE)	P - G	Back door courtesy switch input	Back door open	Below 1 V

If the result is not as specified, the multiplex network door ECU (back door P/W) may have a malfunction.

(e) Using an oscilloscope, check waveform 1.

Waveform 1 (Reference)

Item	Content
Terminal No. (Symbol)	W10-10 (BDCY) - W10-18 (CTYE)
Tool Setting	5 V/DIV., 10 ms/DIV.
Condition	Back door closed

(f) Using an oscilloscope, check waveform 2.

Waveform 2 (Reference)

Item	Content
Terminal No. (Symbol)	W10-10 (BDCY) - W10-18 (CTYE)
Tool Setting	5 V/DIV., 10 ms/DIV.
Condition	Back door closed

3. CHECK CERTIFICATION ECU

(a) Disconnect the F79 certification ECU connector.

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
F79-1 (+B) - F79-15 (E)	V - W-B	+B power supply	Always	11 to 14 V
F79-15 (E) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
F79-16 (IG) - F79-15 (E)	W - W-B	IG power supply	Engine switch off → Engine switch on (IG)	Below 1 V → 11 to 14 V
F79-17 (CUTB) - F79-15 (E)	L - W-B	+B power supply	Always	11 to 14 V

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

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
F78-5 (RCO) - F79-15 (E)	L - W-B	Door control receiver power source	Engine switch off, all doors closed and transmitter switch not pressed → pressed	Below 1 V → 4.5 to 5.5 V
F78-15 (RDA) - F79-15 (E)	G - W-B	Door control receiver data input signal	Engine switch off	11 to 14 V pulse generation at regular intervals
F78-16 (RSSI) - F79-15 (E)	P - W-B	Door control receiver electric wave existence signal	All doors locked, all doors closed and transmitter switch not pressed → pressed	11 to 14 V → Below 2 V

If the result is not as specified, the certification ECU may have a malfunction.

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