Toyota CH-R Service Manual: Terminals Of Ecu

Toyota CH-R Service Manual / Seat Belt / Seat Belt Warning System(w/ Occupant Classification System) / Terminals Of Ecu

TERMINALS OF ECU

CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Main Body ECU (Multiplex Network Body ECU) with 1 Connector

Main Body ECU (Multiplex Network Body ECU) with 2 Connectors

(a) Disconnect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.

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(b) Reconnect the instrument panel junction block assembly connectors.

HINT:

Measure the values on the wire harness side with the connector disconnected.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
MB-31 (BECU) - Body ground	-	Battery power supply	Always	11 to 14 V
MB-32 (IG) - Body ground	-	Ignition power supply (IG signal)	Ignition switch ON → off	11 to 14 V → Below 1 V
MB-30 (ACC) - Body ground	-	Ignition power supply (ACC signal)	Ignition switch ACC → off	11 to 14 V → Below 1 V
MB-11 (GND1) - Body ground	-	Ground	Always	Below 1 Ω
MB-2 (RCTY) - Body ground	-	Rear door courtesy light switch RH input	Rear door LH closed (OFF)	10 kΩ or higher
MB-2 (RCTY) - Body ground	-	Rear door courtesy light switch RH input	Rear door LH open (ON)	Below 1 Ω
MB-13 (LCTY) - Body ground	-	Rear door courtesy light switch LH input	Rear door RH closed (OFF)	10 kΩ or higher
MB-13 (LCTY) - Body ground	-	Rear door courtesy light switch LH input	Rear door RH open (ON)	Below 1 Ω

CHECK COMBINATION METER ASSEMBLY

(a) Disconnect the F4 combination meter assembly connector.

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

HINT:

Measure the values on the wire harness side with the connector disconnected.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
F4-40 (B) - Body ground	SB - Body ground	Battery power supply	Always	11 to 14 V
F4-39 (IG+) - Body ground	P - Body ground	Ignition power supply	Ignition switch off	Below 1 V
F4-39 (IG+) - Body ground	P - Body ground	Ignition power supply	Ignition switch ON	11 to 14 V
F4-21 (ET) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
F4-10 (MSD) - Body ground	V - Body ground	Rear LH seat belt buckle switch signal	Rear LH seat belt fastened	10 kΩ or higher
F4-10 (MSD) - Body ground	V - Body ground	Rear LH seat belt buckle switch signal	Rear LH seat belt unfastened	Below 1 Ω
F4-11 (MSTI) - Body ground	BE - Body ground	Rear center seat belt buckle switch signal	Rear center seat belt fastened	10 kΩ or higher
F4-11 (MSTI) - Body ground	BE - Body ground	Rear center seat belt buckle switch signal	Rear center seat belt unfastened	Below 1 Ω
F4-13 (MSFM) - Body ground	R - Body ground	Rear RH seat belt buckle switch signal	Rear RH seat belt fastened	10 kΩ or higher
F4-13 (MSFM) - Body ground	R - Body ground	Rear RH seat belt buckle switch signal	Rear RH seat belt unfastened	Below 1 Ω
F4-3 (RRMT) - Body ground	W - Body ground	Rear RH seat belt warning light signal	Ignition switch ON, Rear RH seat belt unfastened within 34 seconds after closing rear door	Below 1 V
F4-3 (RRMT) - Body ground	W - Body ground	Rear RH seat belt warning light signal	Ignition switch ON, Rear RH seat belt fastened within 34 seconds after closing rear door	11 to 14 V
F4-2 (RCMT) - Body ground	V - Body ground	Rear center seat belt warning light signal	Ignition switch ON, Rear center seat belt unfastened within 34 seconds after closing rear door	Below 1 V
F4-2 (RCMT) - Body ground	V - Body ground	Rear center seat belt warning light signal	Ignition switch ON, Rear center seat belt fastened within 34 seconds after closing rear door	11 to 14 V
F4-1 (RLMT) - Body ground	L - Body ground	Rear LH seat belt warning light signal	Ignition switch ON, Rear LH seat belt unfastened within 34 seconds after closing rear door	Below 1 V
F4-1 (RLMT) - Body ground	L - Body ground	Rear LH seat belt warning light signal	Ignition switch ON, Rear LH seat belt fastened within 34 seconds after closing rear door	11 to 14 V

CHECK AIRBAG SENSOR ASSEMBLY

Terminal No.	Terminal Symbol	Destination
M1-10	LBE+	Front seat inner belt assembly LH
M1-18	LBE-	Front seat inner belt assembly LH

CHECK OCCUPANT DETECTION 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
Y6-10 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 V
Y6-6 (IG2) - Y6-10 (GND)	B - W-B	Power source	Ignition switch ON	11 to 14 V
Y6-9 (BGND) - Y6-10 (GND)	P - W-B	Front passenger buckle switch ground	Always	Below 1 V
Y6-7 (BSW) - Y6-9 (BGND)	G - P	Front passenger buckle switch signal	Always	Pulse generation
Y5-1 (SVC1) - Y5-5 (SGD1)	R - G	Front occupant classification sensor LH power supply	Ignition switch ON	11 to 14 V
Y5-2 (SVC3) - Y5-6 (SGD3)	GR - W	Rear occupant classification sensor LH power supply	Ignition switch ON	11 to 14 V
Y5-3 (SIG1) - Y5-5 (SGD1)	P - G	Front occupant classification sensor LH signal	Ignition switch ON	Pulse generation
Y5-4 (SIG3) - Y5-6 (SGD3)	SB - W	Rear occupant classification sensor LH signal	Ignition switch ON	Pulse generation
Y5-5 (SGD1) - Y6-10 (GND)	G - W-B	Front occupant classification sensor LH ground	Always	Below 1 V
Y5-6 (SGD3) - Y6-10 (GND)	W - W-B	Rear occupant classification sensor LH ground	Always	Below 1 V

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