Toyota 4Runner: Terminals Of Ecu

Toyota 4Runner Service Manual / Vehicle Interior / Seat Belt / Seat Belt Warning System / Terminals Of Ecu

TERMINALS OF ECU

1. CHECK COMBINATION METER ASSEMBLY

(a) Disconnect the F14 combination meter assembly connector.

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
F14-15 (B) - Body ground	L - Body ground	Battery power supply	Always	11 to 14 V
F14-17 (IG+) - Body ground	R - Body ground	Ignition switch power supply	Ignition switch off	Below 1 V
F14-17 (IG+) - Body ground	R - Body ground	Ignition switch power supply	Ignition switch ON	11 to 14 V
F14-20 (E1) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

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

2. CHECK CENTER AIRBAG SENSOR ASSEMBLY

Terminal No.	Symbol	Description
O1-10	LBE+	Front seat inner belt assembly LH (Seat belt buckle switch LH)
O1-18	LBE-	Front seat inner belt assembly LH (Seat belt buckle switch LH)
N1-16	FSR+	Occupant detection ECU
N1-24	FSR-	Occupant detection ECU

3. CHECK OCCUPANT DETECTION ECU

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
a9-1 (+B) - a9-3 (GND)	W - W-B	Battery power supply	Always	11 to 14 V
a9-2 (DIA) - a9-3 (GND)	GR - W-B	Diagnosis (DLC3)	Ignition switch ON	Pulse generation
a9-3 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 V
a9-4 (FSR-) - a9-3 (GND)	LG - W-B	Center airbag sensor assembly communication line	Always	Below 1 V
a9-5 (BGND) - a9-3 (GND)	P - W-B	Front passenger side buckle switch ground line	Always	Below 1 V
a9-7 (IG2) - a9-3 (GND)	B - W-B	Ignition switch power supply	Ignition switch ON	11 to 14 V
a9-8 (FSR+) - a9-4 (FSR-)	L - LG	Center airbag sensor assembly communication line	Ignition switch ON	Pulse generation
a9-9 (BSW) - a9-5 (BGND)	G - P	Front passenger side buckle switch line	Always	Pulse generation
a10-1 (SGD1) - a9-3 (GND)	G - W-B	Front occupant classification sensor LH ground line	Always	Below 1 V
a10-2 (SGD2) - a9-3 (GND)	LG - W-B	Front occupant classification sensor RH ground line	Always	Below 1 V
a10-3 (SGD3) - a9-3 (GND)	W - W-B	Rear occupant classification sensor LH ground line	Always	Below 1 V
a10-4 (SGD4) - a9-3 (GND)	BR - W-B	Rear occupant classification sensor RH ground line	Always	Below 1 V
a10-11 (SVC1) - a10-1 (SGD1)	R - G	Front occupant classification sensor LH power supply line	Ignition switch ON, load applied to front occupant classification sensor LH	4.9 to 5.1 V
a10-12 (SVC2) - a10-2 (SGD2)	W - LG	Front occupant classification sensor RH power supply line	Ignition switch ON, load applied to front occupant classification sensor RH	4.9 to 5.1 V
a10-5 (SVC3) - a10-3 (SGD3)	GR - W	Rear occupant classification sensor LH power supply line	Ignition switch ON, load applied to rear occupant classification sensor LH	4.9 to 5.1 V
a10-6 (SVC4) - a10-4 (SGD4)	V - BR	Rear occupant classification sensor RH power supply line	Ignition switch ON, load applied to rear occupant classification sensor RH	4.9 to 5.1 V
a10-7 (SIG1) - a10-1 (SGD1)	P - G	Front occupant classification sensor LH signal line	Ignition switch ON, load applied to front occupant classification sensor LH	0 to 5.1 V
a10-8 (SIG2) - a10-2 (SGD2)	L - LG	Front occupant classification sensor RH signal line	Ignition switch ON, load applied to front occupant classification sensor RH	0 to 5.1 V
a10-9 (SIG3) - a10-3 (SGD3)	SB - W	Rear occupant classification sensor LH signal line	Ignition switch ON, load applied to rear occupant classification sensor LH	0 to 5.1 V
a10-10 (SIG4) - a10-4 (SGD4)	B - BR	Rear occupant classification sensor RH signal line	Ignition switch ON, load applied to rear occupant classification sensor RH	0 to 5.1 V

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

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