METER / GAUGE SYSTEM TERMINALS OF ECU

COMBINATION METER ASSEMBLY

Measure the voltage and resistance and check for pulses according to the value (s) in the table below.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
O3-2 (MSM+) - Body ground	L - Body ground	Steering pad switch signal	Power switch on (IG), enter, back and top switches on steering pad switch assembly not pushed	4.3 to 6 V
			Power switch on (IG), enter switch on steering pad switch assembly pushed	Below 0.6 V
			Power switch on (IG), back switch on steering pad switch assembly pushed	2.3 to 3.2 V
			Power switch on (IG), top switch on steering pad switch assembly pushed	1 to 2 V
O3-3 (MSTI) - Body ground	P - Body ground	Steering pad switch signal	Power switch on (IG), up, down, right and left switches on steering pad switch assembly not pushed	4.3 to 6 V
			Power switch on (IG), up switch on steering pad switch assembly pushed	1 to 2 V
			Power switch on (IG), down switch on steering pad switch assembly pushed	2.3 to 3.2 V
			Power switch on (IG), right switch on steering pad switch assembly pushed	3.4 to 4.1 V
			Power switch on (IG), left switch on steering pad switch assembly pushed	Below 0.6 V
O3-4 (ODO) - Body ground	L - Body ground	ODO/TRIP switch signal	Power switch on (IG), ODO/TRIP switch not pushed	4 to 6 V
O3-4 (ODO) - Body ground	L - Body ground	ODO/TRIP switch signal	Power switch on (IG), ODO/TRIP switch pushed	Below 1 V
O3-6 (PBKL) - Body ground	P - Body ground	Front passenger seatbelt buckle switch signal	Power switch on (IG), front passenger seat belt unfastened	Below 1 V
O3-6 (PBKL) - Body ground	P - Body ground	Front passenger seatbelt buckle switch signal	Power switch on (IG), front passenger seat belt fastened	11 to 14 V
O3-7 (PODS) - Body ground	V - Body ground	Occupant detection sensor signal	Power switch on (IG), front passenger seat not occupied	Below 1 V
O3-7 (PODS) - Body ground	V - Body ground	Occupant detection sensor signal	Power switch on (IG), front passenger seat occupied	11 to 14 V
O3-9 (S) - Body ground	LG - Body ground	Oil pressure signal	Engine started	11 to 14 V
O3-9 (S) - Body ground	LG - Body ground	Oil pressure signal	Engine not started	Below 1 V
O3-12 (RRSB) - Body ground*	R - Body ground	Rear seat belt warning light RH signal	Power switch on (IG), rear seat belt warning light RH off	11 to 14 V
O3-12 (RRSB) - Body ground*	R - Body ground	Rear seat belt warning light RH signal	Power switch on (IG), rear seat belt warning light RH on	Below 1 V
O3-14 (RLSB) - Body ground*	G - Body ground	Rear seat belt warning light LH signal	Power switch on (IG), rear seat belt warning light LH off	11 to 14 V
O3-14 (RLSB) - Body ground*	G - Body ground	Rear seat belt warning light LH signal	Power switch on (IG), rear seat belt warning light LH on	Below 1 V
O3-15 (OILW) - Body ground	GR - Body ground	Engine oil level signal	Power switch on (IG), engine oil level not low	11 to 14 V
O3-15 (OILW) - Body ground	GR - Body ground	Engine oil level signal	Power switch on (IG), engine oil level low	Below 1 V
O3-16 (WLVL) - Body ground	V - Body ground	Washer fluid level signal	Power switch on (IG), washer fluid level not low	11 to 14 V
O3-16 (WLVL) - Body ground	V - Body ground	Washer fluid level signal	Power switch on (IG), washer fluid level low	Below 1 V
O3-19 (+S) - Body ground	L - Body ground	Speed signal for other systems (Output)	Power switch on (IG), wheel being rotated	Pulse generation (See waveform 1)
O3-20 (SI) - Body ground	V - Body ground	Speed signal for other system (Input)	Power switch on (IG), wheel being rotated	Pulse generation (See waveform 1)
O3-21 (IG+) - Body ground	B - Body ground	Power switch signal	Power switch off	Below 1 V
O3-21 (IG+) - Body ground	B - Body ground	Power switch signal	Power switch on (IG)	11 to 14 V
O3-22 (B) - Body ground	LG - Body ground	Auxiliary battery	Power switch off	11 to 14 V
O3-25 (TR) - Body ground	P - Body ground	Light control rheostat switch signal	Power switch on (IG), up switch and down switch of trip switch not pushed	4 to 6 V
O3-25 (TR) - Body ground	P - Body ground	Light control rheostat switch signal	Power switch on (IG), up switch or down switch of trip switch pushed	Below 1 V
O3-26 (SW3) - Body ground	W - Body ground	Ground for trip switch	Always	Below 1 Ω
O3-27 (FR) - K3-28 (FE)	SB - GR	Fuel level signal	Power switch on (IG), fuel level full	Below 1 V
O3-27 (FR) - K3-28 (FE)	SB - GR	Fuel level signal	Power switch on (IG), fuel level low (fuel level warning light on)	4.5 to 9 V
O3-29 (CANH)	LG	CAN communication line	-	-
O3-30 (CANL)	B	CAN communication line	-	-
O3-31 (ES) - Body ground	BR - Body ground	Ground	Always	Below 1 Ω
O3-35 (RLMT) - Body ground*	L - Body ground	Rear seat belt buckle switch LH signal	Power switch on (IG), rear seat belt LH unfastened	Below 1 V
O3-35 (RLMT) - Body ground*	L - Body ground	Rear seat belt buckle switch LH signal	Power switch on (IG), rear seat belt LH fastened	11 to 14 V
O3-37 (RRMT) - Body ground*	R - Body ground	Rear seat belt buckle switch RH signal	Power switch on (IG), rear seat belt RH unfastened	Below 1 V
O3-37 (RRMT) - Body ground*	R - Body ground	Rear seat belt buckle switch RH signal	Power switch on (IG), rear seat belt RH fastened	11 to 14 V
O3-39 (ILL-) - Body ground	BE - Body ground	Illumination signal	Headlight dimmer switch off	Below 1 V
O3-39 (ILL-) - Body ground	BE - Body ground	Illumination signal	Headlight dimmer switch in tail or head position	Pulse generation
O3-40 (EP) - Body ground	BR - Body ground	Ground	Always	Below 1 Ω
O4-1 (B) - Body ground	B - Body ground	Auxiliary battery	Power switch off	11 to 14 V
O4-2 (HZSW) - Body ground	W - Body ground	Hazard warning signal switch signal (Input)	Hazard warning signal switch not pressed	11 to 14 V
O4-2 (HZSW) - Body ground	W - Body ground	Hazard warning signal switch signal (Input)	Hazard warning signal switch pressed	Below 1 V
O4-3 (ER) - Body ground	P - Body ground	RH turn indicator light signal (Input)	Power switch on (IG), RH turn signal switch off	11 to 14 V
O4-3 (ER) - Body ground	P - Body ground	RH turn indicator light signal (Input)	Power switch on (IG), RH turn signal switch on	Below 1 V
O4-4 (EL) - Body ground	GR - Body ground	LH turn indicator light signal (Input)	Power switch on (IG), LH turn signal switch off	11 to 14 V
O4-4 (EL) - Body ground	GR - Body ground	LH turn indicator light signal (Input)	Power switch on (IG), LH turn signal switch on	Below 1 V
O4-5 (TRNR) - Body ground	R - Body ground	RH turn indicator light signal (Output)	Power switch on (IG), RH turn indicator light off	Below 1 V
O4-5 (TRNR) - Body ground	R - Body ground	RH turn indicator light signal (Output)	Power switch on (IG), RH turn indicator light blinking	11 to 14 V ←→ Below 1 V
O4-7 (LR) - Body ground	R - Body ground	RH turn indicator light signal (Output)	Power switch on (IG), RH turn indicator light off	Below 1 V
O4-7 (LR) - Body ground	R - Body ground	RH turn indicator light signal (Output)	Power switch on (IG), RH turn indicator light blinking	11 to 14 V ←→ Below 1 V
O4-9 (MSCL)	B	Local bus communication line	-	-
O4-10 (MSCH)	R	Local bus communication line	-	-
O4-11 (TRNL) - Body ground	LG - Body ground	LH turn indicator light signal (Output)	Power switch on (IG), LH turn indicator light off	Below 1 V
O4-11 (TRNL) - Body ground	LG - Body ground	LH turn indicator light signal (Output)	Power switch on (IG), LH turn indicator light blinking	11 to 14 V ←→ Below 1 V
O4-12 (HAZM) - Body ground	B - Body ground	Hazard warning signal switch signal (Output)	Hazard warning signal switch not pressed	11 to 14 V
O4-12 (HAZM) - Body ground	B - Body ground	Hazard warning signal switch signal (Output)	Hazard warning signal switch pressed	Below 1 V
O4-13 (LL) - Body ground	G - Body ground	LH turn indicator light signal (Output)	Power switch on (IG), LH turn indicator light off	Below 1 V
O4-13 (LL) - Body ground	G - Body ground	LH turn indicator light signal (Output)	Power switch on (IG), LH turn indicator light blinking	11 to 14 V ←→ Below 1 V

*: w/ Rear Seat Belt Warning

Waveform 1 (Reference):

Item	Condition
Tester Connection	O3-19 (+S) - Body ground O3-20 (SI) - Body ground
Tool setting	5 V/DIV., 20 ms./DIV.
Vehicle condition	Power switch on (IG), wheel being rotated

Tech Tips

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.