Toyota Tacoma 2015-2018 Service Manual: Terminals Of Ecu

Toyota Tacoma 2015-2018 Service Manual / Seat Belt / Seat Belt Warning System / Terminals Of Ecu

TERMINALS OF ECU

1. CHECK COMBINATION METER ASSEMBLY

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
C9-19 (B) - Body ground	P - Body ground	Battery power supply	Always	11 to 14 V
C9-20 (IG+) - Body ground	BE - Body ground	Ignition switch power supply	Ignition switch ON	11 to 14 V
C9-20 (IG+) - Body ground	BE - Body ground	Ignition switch power supply	Ignition switch off	Below 1 V
C9-17 (EP) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
C9-18 (ES) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
C9-1 (CANH) - Body ground	G - Body ground	CAN communication line	Always	200 Ω or higher
C9-2 (CANL) - Body ground	W - Body ground	CAN communication line	Always	200 Ω or higher

If the result is not as specified, the combination meter assembly may have a malfunction.

2. CHECK CENTER AIRBAG SENSOR ASSEMBLY

Terminal No.	Terminal Symbol	Destination
A23-12	FSR+	Occupant classification ECU
A23-13	FSR-	Occupant classification ECU
A22-11	LBE+	Front seat inner belt assembly (for driver side)
A22-12	LBE-	Front seat inner belt assembly (for driver side)

3. CHECK OCCUPANT CLASSIFICATION ECU

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
O5-1 (+B) - O5-3 (GND)	R - W-B	Battery power supply	Always	11 to 14 V
O5-2 (DIA) - O5-3 (GND)	W - W-B	Diagnosis (DLC3)	Ignition switch ON	Pulse generation
O5-3 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 V
O5-7 (IG) - O5-3 (GND)	BE - W-B	Ignition switch power supply	Ignition switch ON	11 to 14 V
O5-8 (FSR+) - O5-4 (FSR-)	W - B	Center airbag sensor assembly communication line	Ignition switch ON	Pulse generation
O5-9 (BSW) - O5-5 (BGND)	G - P-G	Front passenger side buckle switch line	Always	4 to 14 V
O4-1 (SGD1) - O5-3 (GND)	L - W-B	Front occupant classification sensor LH ground line	Always	Below 1 V
O4-2 (SGD2) - O5-3 (GND)	BE - W-B	Front occupant classification sensor RH ground line	Always	Below 1 V
O4-3 (SGD3) - O5-3 (GND)	P-G - W-B	Rear occupant classification sensor LH ground line	Always	Below 1 V
O4-4 (SGD4) - O5-3 (GND)	B-R - W-B	Rear occupant classification sensor RH ground line	Always	Below 1 V
O4-11 (SVC1) - O4-1 (SGD1)	B-L - L	Front occupant classification sensor LH power supply line	Ignition switch ON, a load applied to front occupant classification sensor LH	4.9 to 5.1 V
O4-12 (SVC2) - O4-2 (SGD2)	LG-B - BE	Front occupant classification sensor RH power supply line	Ignition switch ON, a load applied to front occupant classification sensor RH	4.9 to 5.1 V
O4-5 (SVC3) - O4-3 (SGD3)	B - P-G	Rear occupant classification sensor LH power supply line	Ignition switch ON, a load applied to rear occupant classification sensor LH	4.9 to 5.1 V
O4-6 (SVC4) - O4-4 (SGD4)	GR-L - B-R	Rear occupant classification sensor RH power supply line	Ignition switch ON, a load applied to rear occupant classification sensor RH	4.9 to 5.1 V
O4-7 (SIG1) - O4-1 (SGD1)	G - L	Front occupant classification sensor LH signal line	Ignition switch ON, a load applied to front occupant classification sensor LH	0 to 5.1 V
O4-8 (SIG2) - O4-2 (SGD2)	R-L - BE	Front occupant classification sensor RH signal line	Ignition switch ON, a load applied to front occupant classification sensor RH	0 to 5.1 V
O4-9 (SIG3) - O4-3 (SGD3)	R-B - P-G	Rear occupant classification sensor LH signal line	Ignition switch ON, a load applied to rear occupant classification sensor LH	0 to 5.1 V
O4-10 (SIG4) - O4-4 (SGD4)	L-R - B-R	Rear occupant classification sensor RH signal line	Ignition switch ON, a load applied to rear occupant classification sensor RH	0 to 5.1 V

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

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