Toyota 4Runner: Terminals Of Ecu

Toyota 4Runner Service Manual / Vehicle Interior / Supplemental Restraint Systems / Occupant Classification System / Terminals Of Ecu

TERMINALS OF ECU

1. CHECK OCCUPANT CLASSIFICATION 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 signal 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 signal 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 power supply 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 power supply line	Ignition switch ON, load applied to rear occupant classification sensor RH	0 to 5.1 V

Problem Symptoms Table

PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are lis ...

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DATA LIST / ACTIVE TEST NOTICE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether ...

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