Toyota 4Runner: Terminals Of Ecu

Toyota 4Runner Service Manual / Vehicle Exterior / Wiper / Washer / Wiper And Washer System / Terminals Of Ecu

TERMINALS OF ECU

1. CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY AND 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	-	Ignition switch power supply	Ignition switch ON	11 to 14 V
A-32 (IG) - Body ground	-	Ignition switch power supply	Ignition switch off	Below 1 V
A-29 (ACC) - Body ground	-	ACC power supply	Ignition switch ACC	11 to 14 V
A-29 (ACC) - Body ground	-	ACC power supply	Ignition 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
F10-8 (RWSW) - Body ground	P - Body ground	Rear washer switch input	Ignition switch ON, rear washer switch on	Below 1 V
F10-8 (RWSW) - Body ground	P - Body ground	Rear washer switch input	Ignition switch ON, rear washer switch off	Pulse generation (See waveform 1 or 2)
F10-17 (RWLS) - Body ground	R- Body ground	Rear wiper switch input	Ignition switch ON, rear wiper switch INT	Below 1 V
F10-17 (RWLS) - Body ground	R - Body ground	Rear wiper switch input	Ignition switch ON, rear wiper switch off	Pulse generation (See waveform 1 or 2)
F9-1 (RWC1) - Body ground	B - Body ground	Rear wiper switch input	Ignition switch ON, rear wiper switch LO	Below 1 V
F9-1 (RWC1) - Body ground	B- Body ground	Rear wiper switch input	Ignition switch ON, rear wiper switch off	Pulse generation (See waveform 1 or 2)
F8-2 (BW) - Body ground	B - Body ground	Rear washer relay operation output	Ignition switch ON, rear wiper switch on	Below 1 V
F8-2 (BW) - Body ground	B - Body ground	Rear washer relay operation output	Ignition switch ON, rear wiper switch off	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)	F10-8 (RWSW) - Body ground F10-17 (RWLS) - Body ground F9-1 (RWC1) - Body ground
Tool Setting	5 V/DIV., 20 ms/DIV.
Condition	Ignition switch ON, rear washer switch off

(f) Using an oscilloscope, check waveform 2.

Waveform 2 (Reference)

Item	Content
Terminal No. (Symbol)	F10-8 (RWSW) - Body ground F10-17 (RWLS) - Body ground F9-1 (RWC1) - Body ground
Tool Setting	5 V/DIV., 20 ms/DIV.
Condition	Ignition switch ON, rear washer switch off

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.

HINT:

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

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	Ignition switch power supply	Ignition switch ON	11 to 14 V
V2-8 (SIG) - Body ground	G - Body ground	Ignition switch power supply	Ignition 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 voltage according to the value(s) in the table below.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
V2-3 (W) - V2-12 (SGND)	R - G	Rear wiper reverse position switch input	Ignition switch ON and rear wiper switch on (rear wiper reverse position switch off)	Pulse generation (See waveform 1)
V2-3 (W) - V2-12 (SGND)	R - G	Rear wiper reverse position switch input	Ignition switch ON and rear wiper switch on (rear wiper reverse position switch on)	Pulse generation (See waveform 2)
V2-4 (P) - V2-12 (SGND)	V - G	Rear wiper retractable position switch input	Ignition switch ON and rear wiper switch on (rear wiper retractable position switch off)	Pulse generation (See waveform 3)
V2-4 (P) - V2-12 (SGND)	V - G	Rear wiper retractable position switch input	Ignition switch ON and rear wiper switch on (rear wiper retractable position switch on)	Pulse generation (See waveform 4)
V2-2 (WIP+) - V2-6 (GND)	L - W-B	Rear wiper motor output	Ignition switch ON, rear wiper switch INT	Pulse generation (See waveform 5)
V2-5 (WIP-) - V2-6 (GND)	P - W-B	Rear wiper motor output	Ignition switch ON, rear wiper switch INT	Pulse generation (See waveform 6)
V2-2 (WIP+) - V2-6 (GND)	L - W-B	Rear wiper motor output	Ignition switch ON, rear wiper switch LO	Pulse generation (See waveform 7)
V2-5 (WIP-) - V2-6 (GND)	P - W-B	Rear wiper motor output	Ignition switch ON, rear wiper switch LO	Pulse generation (See waveform 8)
V2-2 (WIP+) - V2-6 (GND)	L - W-B	Rear wiper motor output	Ignition switch ON, rear washer switch on	Pulse generation (See waveform 9)
V2-5 (WIP-) - V2-6 (GND)	P - W-B	Rear wiper motor output	Ignition switch ON, rear washer switch on	Pulse generation (See waveform 10)
V2-2 (WIP+) - V2-6 (GND)	L - W-B	Rear wiper motor output	Ignition switch ON, rear wiper switch off	Pulse generation (See waveform 11)
V2-5 (WIP-) - V2-6 (GND)	P - W-B	Rear wiper motor output	Ignition switch ON, rear wiper switch off	Pulse generation (See waveform 12)

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)	V2-3 (W) - V2-12 (SGND)
Tool Setting	5 V/DIV., 10 ms/DIV
Condition	Ignition switch ON and rear wiper switch on (rear wiper reverse position switch off)

(f) Using an oscilloscope, check waveform 2.

Waveform 2 (Reference)

Item	Content
Terminal No. (Symbol)	V2-3 (W) - V2-12 (SGND)
Tool Setting	5 V/DIV., 10 ms/DIV
Condition	Ignition switch ON and rear wiper switch on (rear wiper reverse position switch on)

(g) Using an oscilloscope, check waveform 3.

Waveform 3 (Reference)

Item	Content
Terminal No. (Symbol)	V2-4 (P) - V2-12 (SGND)
Tool Setting	2 V/DIV., 2 ms/DIV
Condition	Ignition switch ON and rear wiper switch on (rear wiper retractable position switch off)

(h) Using an oscilloscope, check waveform 4.

Waveform 4 (Reference)

Item	Content
Terminal No. (Symbol)	V2-4 (P) - V2-12 (SGND)
Tool Setting	2 V/DIV., 2 ms/DIV
Condition	Ignition switch ON and rear wiper switch on (rear wiper retractable position switch on)

(i) Using an oscilloscope, check waveform 5.

Waveform 5 (Reference)

Item	Content
Terminal No. (Symbol)	V2-2 (WIP+) - V2-6 (GND)
Tool Setting	2 V/DIV., 2 ms/DIV
Condition	Ignition switch ON, rear wiper switch INT

(j) Using an oscilloscope, check waveform 6.

Waveform 6 (Reference)

Item	Content
Terminal No. (Symbol)	V2-5 (WIP-) - V2-6 (GND)
Tool Setting	2 V/DIV., 2 ms/DIV
Condition	Ignition switch ON, rear wiper switch INT

(k) Using an oscilloscope, check waveform 7.

Waveform 7 (Reference)

Item	Content
Terminal No. (Symbol)	V2-2 (WIP+) - V2-6 (GND)
Tool Setting	2 V/DIV., 2 ms/DIV
Condition	Ignition switch ON, rear wiper switch LO

(l) Using an oscilloscope, check waveform 8.

Waveform 8 (Reference)

Item	Content
Terminal No. (Symbol)	V2-5 (WIP-) - V2-6 (GND)
Tool Setting	2 V/DIV., 2 ms/DIV
Condition	Ignition switch ON, rear wiper switch LO

(m) Using an oscilloscope, check waveform 9.

Waveform 9 (Reference)

Item	Content
Terminal No. (Symbol)	V2-2 (WIP+) - V2-6 (GND)
Tool Setting	2 V/DIV., 2 ms/DIV
Condition	Ignition switch ON, rear washer switch on

(n) Using an oscilloscope, check waveform 10.

Waveform 10 (Reference)

Item	Content
Terminal No. (Symbol)	V2-5 (WIP-) - V2-6 (GND)
Tool Setting	2 V/DIV., 2 ms/DIV
Condition	Ignition switch ON, rear washer switch on

(o) Using an oscilloscope, check waveform 11.

Waveform 11 (Reference)

Item	Content
Terminal No. (Symbol)	V2-2 (WIP+) - V2-6 (GND)
Tool Setting	2 V/DIV., 2 ms/DIV
Condition	Ignition switch ON, rear wiper switch off

(p) Using an oscilloscope, check waveform 12.

Waveform 12 (Reference)

Item	Content
Terminal No. (Symbol)	V2-5 (WIP-) - V2-6 (GND)
Tool Setting	2 V/DIV., 2 ms/DIV
Condition	Ignition switch ON, rear wiper switch off

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