SEAT BELT WARNING SYSTEM(w/o Occupant Classification System) TERMINALS OF ECU
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CHECK COMBINATION METER ASSEMBLY
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Disconnect the I10 combination meter assembly connector.
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Measure the resistance and voltage according to the value(s) in the table below.
Tester Connection Wiring Color Terminal Description Condition Specified Condition I10-21 (IG+) - Body ground B - Body ground IG power supply Engine switch on (IG) → off 11 to 14 V → Below 1 V*1
10.5 to 16 V → Below 1 V*2
I10-22 (B) - Body ground Y - Body ground Battery power supply Always 11 to 14 V I10-31 (ES) - Body ground W-B - Body ground Ground Always Below 1 Ω
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*1: w/o Stop and Start System
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*2: w/ Stop and Start System
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Reconnect the I10 combination meter assembly connector.
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Measure the voltage according to the value(s) in the table below.
Tester Connection Wiring Color Terminal Description Condition Specified Condition I10-6 (P/SB) - Body ground L - Body ground Front passenger seat belt buckle switch signal Engine switch on (IG), front passenger seat occupied, seat belt unfastened → fastened 11 to 14 V → Below 1 V I10-12 (RRSB) - Body ground* W - Body ground Rear RH seat belt buckle switch signal Rear RH seat belt unfastened → fastened 11 to 14 V → Below 1 V I10-13 (RCSB) - Body ground* B - Body ground Rear center seat belt buckle switch signal Rear center seat belt unfastened → fastened 11 to 14 V → Below 1 V I10-14 (RLSB) - Body ground* G - Body ground Rear LH seat belt buckle switch signal Rear LH seat belt unfastened → fastened 11 to 14 V → Below 1 V I10-35 (RLMT) - Body ground* W - Body ground Rear LH seat belt warning light signal Rear LH seat belt unfastened → fastened 11 to 14 V → Below 1 V I10-36 (RCMT) - Body ground* G - Body ground Rear center seat belt fastened Rear center seat belt unfastened → fastened 11 to 14 V → Below 1 V I10-37 (RRMT) - Body ground* L - Body ground Rear RH seat belt warning light signal Rear RH seat belt unfastened → fastened 11 to 14 V → Below 1 V
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*: w/ Rear Seat Belt Warning
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CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
*1 Main Body ECU (Multiplex Network Body ECU) - -
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Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
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for LHD: Click here
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for RHD: Click here
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Reconnect the instrument panel junction block assembly connectors.
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Measure the resistance and voltage according to the value(s) in the table below.
Tester Connection Wiring Color Terminal Description Condition Specified Condition A-11 (GND1) - Body ground - Ground Always Below 1 Ω A-30 (ACC) - Body ground - ACC power supply Engine switch on (ACC) → off 11 to 14 V → Below 1 V A-31 (BECU) - Body ground - Battery power supply Always 11 to 14 V A-32 (IG) - Body ground - IG power supply Engine switch on (IG) → off 11 to 14 V → Below 1 V -
Install the main body ECU (multiplex network body ECU) to the instrument panel junction block assembly.
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for LHD: Click here
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for RHD: Click here
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Measure the voltage and check for pulses according to the value(s) in the table below.
Tester Connection Wiring Color Terminal Description Condition Specified Condition 4A-18 (LCTY) - Body ground* W - Body ground Rear door courtesy light switch LH input Rear door LH closed (OFF) Pulse generation Rear door courtesy light switch LH input Rear door LH open (ON) Below 1 V 4D-37 (RCTY) - Body ground* Y - Body ground Rear door courtesy light switch RH input Rear door RH closed (OFF) Pulse generation Rear door courtesy light switch RH input Rear door RH open (ON) Below 1 V
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*: w/ Rear Seat Belt Warning
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CHECK AIRBAG SENSOR ASSEMBLY
Terminal No. Terminal Symbol Destination Q23-15*1 LBE+ Front seat inner belt assembly LH Q23-23*1 LBE- Front seat inner belt assembly LH P23-10*2 RBE+ Front seat inner belt assembly RH P23-18*2 RBE- Front seat inner belt assembly RH
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*1: for LHD
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*2: for RHD
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