Terminals Of Ecu

WARNING: This page is about a different car, the 2007 Lexus ES 350. However, it is still accessible from the selected car via links, so may be relevant.

OCCUPANT CLASSIFICATION ECU

Fig 1: Identifying T4 Connector Terminals Of ECU

ECU CONNECTOR TERMINAL DESCRIPTION CHART

Terminal No. (Symbols)	Wiring Color	Terminal Description	Condition	Specified Condition
T4-5 (GND) - Body ground	W-B - Body ground	Occupant classification ECU ground line	Always	Below 1 V
T4-6 (PS) - T4-15 (GPS)	LG - W	Pressure sensor signal line	Engine switch on (IG)	0 to 5V
T4-7 (VPS) - T4-5 (GND)	Y - W-B	Pressure sensor +B line	Engine switch on (IG)	4.75 to 5.25 V
T4-8 (GBT) - T4-5 (GND)	G - W-B	Belt tension sensor ground line	Always	Below 1 V
T4-9 (IG) - T4-5 (GND)	B - W-B	Occupant classification ECU +B line	Engine switch on (IG)	10 to 14 V
T4-10 (DIA) - T4-5 (GND)	W - W-B	Diagnosis (DLC3)	Engine switch on (IG)	Pulse generation
T4-11 (FSR+) - T4-12 (FSR-)	W - B	Center airbag sensor assembly communication line	Engine switch on (IG)	Pulse generation
T4-12 (FSR-) - T4-5 (GND)	B - W-B	Center airbag sensor assembly communication line (-)	Always	Below 1 V
T4-13 (BSW) - T4-14 (BGND)	B - GR	Passenger side buckle switch line	Engine switch on (IG)	Low: 4 to 7 mA Hi: 12 to 18 mA
T4-14 (BGND) - T4-5 (GND)	GR - W-B	Passenger side buckle switch ground line	Always	Below 1 V
T4-15 (GPS) - T4-5 (GND)	W - W-B	Pressure sensor ground line	Always	Below 1 V
T4-16 (BT) - T4-5 (GND)	R - W-B	Belt tension sensor signal line	Engine switch on (IG)	0 to 5V
T4-17 (VBT) - T4-5 (GND)	P - W-B	Belt tension sensor +B line	Engine switch on (IG)	4.75 to 5.25 V