PRE-CRASH SAFETY SYSTEM TERMINALS OF ECU

CHECK SEAT BELT CONTROL ECU

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

Tech Tips

Check from the rear of the connector while it is connected to the seat belt control ECU.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
E41-2 (MOR+) - E41-8 (PGND)	L - W-B	Passenger side seat belt motor power source line	Ignition switch ON	4 to 8.5 V
E41-3 (MOL+) - E41-8 (PGND)	GR - W-B	Driver side seat belt motor power source line	Ignition switch ON	4 to 8.5 V
E42-8 (IG1) - Body ground	G - Body ground	Seat belt control ECU power source line	Ignition switch ON	11 to 14 V
E41-7 (+B) - Body ground	R - W-B	Seat belt control ECU power source line	Always	11 to 14 V
E41-1 (MOR-) - Body ground	B - Body ground	Passenger side seat belt motor ground line	Ignition switch ON	4 to 8.5 V
E41-4 (MOL-) - Body ground	W - Body ground	Driver side seat belt motor ground line	Ignition switch ON	4 to 8.5 V
E41-5 (PBK+) - Body ground	G - Body ground	Passenger side buckle switch ground line	Always	Below 1 Ω
E41-5 (PBK+) - E41-8 (PGND)	G - W-B	Passenger side buckle switch signal line	Ignition switch ON Front passenger side seat belt unfastened (Buckle switch off)	Waveform 1
E41-5 (PBK+) - E41-8 (PGND)	G - W-B	Passenger side buckle switch signal line	Ignition switch ON Front passenger side seat belt fastened (Buckle switchs on)	Waveform 1
E41-8 (PGND) - Body ground	W-B - Body ground	Seat belt control ECU ground line	Always	Below 1 Ω

If the result is not as specified, the seat belt control ECU may have a malfunction.

Inspect using an oscilloscope.

Waveform 1 (Reference)

Terminal No. (Symbol)	E41-5 (PBK+) - E41-8 (PGND)
Tool Setting	5 V/DIV., 20 ms./DIV.
Switch Condition	Ignition switch ON Front passenger side seat belt unfastened (Buckle switch off)
Switch Condition	Ignition switch ON Front passenger side seat belt fastened (Buckle switch on)