Toyota 4Runner: Terminals Of Ecu

Toyota 4Runner Service Manual / Vehicle Interior / Meter / Gauge / Display / Meter / Gauge System / Terminals Of Ecu

TERMINALS OF ECU

1. COMBINATION METER ASSEMBLY

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
1 (CANH) - Body ground	L - Body ground	CAN communication signal	Ignition switch off	200 Ω or higher
2 (CANL) - Body ground	W - Body ground	CAN communication signal	Ignition switch off	200 Ω or higher
3 (MSSL) - Body ground	P - Body ground	Steering pad switch assembly (DISP switch) signal	Ignition switch to ON, DISP switch not pressed	4 to 5 V
3 (MSSL) - Body ground	P - Body ground	Steering pad switch assembly (DISP switch) signal	Ignition switch to ON, DISP switch pressed	Below 1 V
6 (LINT) - Body ground*1	LG - Body ground	LIN (Drive monitor switch communication)	Ignition switch ON	Pulse generation
7 (RR) - Body ground*2	Y - Body ground	No. 1 Ultrasonic sensor (for rear corner RH)	Clearance warning indication for rear corner RH is displayed	Below 3 V
8 (S) - Body ground	V - Body ground	Oil pressure switch signal	Ignition switch ON, oil pressure warning light off	11 to 14 V
8 (S) - Body ground	V - Body ground	Oil pressure switch signal	Ignition switch ON, oil pressure warning light on	Below 1 V
9 (TIRE) - Body ground	G - Body ground	Tire pressure warning light signal	Ignition switch ON, tire pressure warning light off	11 to 14 V
9 (TIRE) - Body ground	G - Body ground	Tire pressure warning light signal	Ignition switch ON, tire pressure warning light blinking	Below 1 V
10 (IL2-) - Body ground	GR - Body ground	Illumination signal	Light control switch off	Below 1 V
10 (IL2-) - Body ground	GR - Body ground	Illumination signal	Light control switch in tail or head position	Pulse generation
11 (ILL-) - Body ground	GR - Body ground	Illumination signal	Light control switch off	Below 1 V
11 (ILL-) - Body ground	GR - Body ground	Illumination signal	Light control switch in tail or head position	Pulse generation
12 (RL) - Body ground*2	GR - Body ground	No. 1 Ultrasonic sensor (for rear corner LH)	Clearance warning indication for rear corner LH is displayed	Below 3 V
13 (MGND) - Body ground	W-B - Body ground	Ground (Signal ground)	Always	Below 1 V
14 (SW) - Body ground*7	V - Body ground	Brake fluid level warning switch signal	Ignition switch ON, brake fluid level warning light on	Below 1 V
14 (SW) - Body ground*7	V - Body ground	Brake fluid level warning switch signal	Ignition switch ON, brake fluid level warning light off	11 to 14 V
15 (B) - Body ground	L - Body ground	Battery	Always	11 to 14 V
17 (IG+) - Body ground	R - Body ground	Ignition switch signal	Ignition switch off	Below 1 V
17 (IG+) - Body ground	R - Body ground	Ignition switch signal	Ignition switch ON	11 to 14 V
18 (BK) - Body ground*2	SB - Body ground	No. 1 Ultrasonic sensor (for rear corner LH and RH)	Clearance warning indication for back right and left sensor are displayed	Below 3 V
19 (E3) - Body ground	B - Body ground	Ground (Fuel ground)	Always	Below 1 V
20 (E1) - Body ground	W-B - Body ground	Ground	Always	Below 1 V
21 (STP+) - Body ground*3	G - Body ground	Automatic Running Boards warning light signal	Automatic Running Boards warning light on or blinking	11 to 14 V
21 (STP+) - Body ground*3	G - Body ground	Automatic Running Boards warning light signal	Automatic Running Boards warning light off	Below 1 V
22 (STPA) - Body ground*3	W - Body ground	Ground	Automatic Running Boards warning light off	11 to 14 V
22 (STPA) - Body ground*3	W - Body ground	Ground	Ignition switch ON, automatic running boards warning light on	Below 1 V
23 (MSCH) - Body ground*4	LG - Body ground	CAN communication signal	Ignition switch off	200 Ω or higher
24 (MSCL) - Body ground*4	W - Body ground	CAN communication signal	Ignition switch off	200 Ω or higher
25 (B) - Body ground	SB - Body ground	Turn indicator light signal	Ignition switch ON, turn RH indicator light off	Below 1 V
25 (B) - Body ground	SB - Body ground	Turn indicator light signal	Ignition switch ON, turn RH indicator light blinking	11 to 14 V
26 (CHG-) - Body ground	P - Body ground	Charge warning light signal	Ignition switch ON, charge warning light off	11 to 14 V
26 (CHG-) - Body ground	P - Body ground	Charge warning light signal	Ignition switch ON, charge warning light on	Below 1 V
27 (WLVL) - Body ground*5	R - Body ground	Washer level warning switch signal	Ignition switch ON, washer level warning light off	11 to 14 V
27 (WLVL) - Body ground*5	R - Body ground	Washer level warning switch signal	Ignition switch ON, washer level warning light on	Below 1 V
28 (+S) - Body ground	SB - Body ground	Speed signal for other systems (Output)	Driving at approx. 20 km/h (12 mph)	Pulse generation (See waveform 1)
29 (SI) - Body ground	G - Body ground	Speed signal for other systems (Input)	Driving at approx. 20 km/h (12 mph)	Pulse generation (See waveform 1)
30 (CHK) - Body ground	L - Body ground	MIL (Check engine warning light) signal	Ignition switch ON, MIL (Check engine warning light) off	11 to 14 V
30 (CHK) - Body ground	L - Body ground	MIL (Check engine warning light) signal	Ignition switch ON, MIL (Check engine warning light) on	Below 1 V
31 (OP) - Body ground*2	LG - Body ground	Clearance warning ECU signal	Clearance warning indication is displayed	Below 3 V
32 (FL) - Body ground*2	P - Body ground	No. 1 Ultrasonic sensor (for front corner LH)	Clearance warning indication for front corner LH is displayed	Below 3 V
33 (B) - Body ground	Y - Body ground	Turn indicator light signal	Ignition switch ON, turn LH indicator light off	Below 1 V
33 (B) - Body ground	Y - Body ground	Turn indicator light signal	Ignition switch ON, turn LH indicator light blinking	11 to 14 V
35 (FR) - Body ground*2	B - Body ground	No. 1 Ultrasonic sensor (for front corner RH)	Clearance warning indication for front corner RH is displayed	Below 3 V
36 (TC) - Body ground*6	W - Body ground	TAIL cancel switch signal	TAIL cancel switch off	1 MΩ or higher
36 (TC) - Body ground*6	W - Body ground	TAIL cancel switch signal	TAIL cancel switch on	Below 1 Ω
37 (RHIG) - Body ground*6	B - Body ground	Power source for light control rheostat	Ignition switch ON	4.6 to 5.4 V
38 (TR) - Body ground*6	GR - Body ground	Light control rheostat signal	Light control rheostat dial fully turned downward	Below 1 Ω
38 (TR) - Body ground*6	GR - Body ground	Light control rheostat signal	Light control rheostat dial fully turned upward	8 to 12 kΩ
39 (E2) - Body ground*6	LG - Body ground	Light control rheostat switch ground	Always	Below 1 Ω
40 (L) - Body ground	W - Body ground	Fuel level signal	Ignition switch ON, fuel level warning light off	Below 4 V
40 (L) - Body ground	W - Body ground	Fuel level signal	Ignition switch ON, fuel level warning light on	4 to 9 V

*1: w/ CRAWL Control
*2: w/ Intuitive Parking Assist System
*3: w/ Automatic Running Board System
*4: w/ Seat Position Memory
*5: w/ Level Warning Switch Assembly
*6: w/ Light Control Rheostat
*7: for 2WD

(b) Using an oscilloscope, check waveform 1.

Waveform 1 (Reference)

Item	Condition
Tool setting	5 V/DIV., 20 ms./DIV.
Vehicle condition	Driving at approx. 20 km/h (12 mph)

HINT:

When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.

2. ACCESSORY METER ASSEMBLY

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
G36-1 (B) - Body ground	L - Body ground	Battery	Always	11 to 14 V
G36-2 (ACC) - Body ground	P - Body ground	Ignition switch signal	Ignition switch off	Below 1 V
G36-2 (ACC) - Body ground	P - Body ground	Ignition switch signal	Ignition switch ACC	11 to 14 V
G36-3 (ILL+) - Body ground	G - Body ground	Illumination signal	Light control switch in tail or head position	11 to 14 V
G36-7 (E) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

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