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Terminals Of Ecu

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FRONT CONTROLLER (MULTIPLEX NETWORK BODY ECU) 
    Fig 1: Identifying Front Controller Connector Location
    G05299024Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    CONNECTOR TERMINAL REFERENCE CHART

    Terminal No. Wiring Color Terminal Description Condition Specified Condition
    2E-3 - 2F-1 B-Y - W-B IG signal circuit (to IG relay) Engine switch off Below 1 V
    Engine switch on (IG) 11 to 14 V
    2E-4 - 2F-1 G-R - W-B Power source circuit (from battery) Always 11 to 14 V
    2F-1 - Body ground W-B - Body ground Ground circuit Always Below 1 V
    2F-4 - 2F-1 L-W-B Windshield washer motor circuit Windshield washer motor OFF Below 1 V
    Windshield washer motor ON 11 to 14 V
    2F-5 - 2F-1 L-W-B Multiplex communication signal circuit Engine switch on (IG) Signal waveform
    2F-6 - 2F-1 GR - W-B Multiplex communication signal circuit Engine switch on (IG) Signal waveform
    2F-8 - 2F-1 L-O - W-B Headlight cleaner operation signal Windshield washer motor OFF 4 5 to 5 5 V
    Windshield washer motor ON Below 1 V
    2F-7 - 2F-1 V-W-B Washer fluid level warning switch signal Washer fluid level is normal 11 to 14 V
    Washer jar is empty Below 1 V
  2. CHECK MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH) 
    Fig 2: Identifying Main Body ECU RH Connector Location
    G05756233Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    CONNECTOR TERMINAL REFERENCE CHART

    Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
    RA-20 (MPX1) - RD-7 (GND2) GR - W-B Multiplex communication signal circuit Engine switch on (IG) Signal waveform
    RD-7 (GND2) - Body ground W-B - Body ground Ground circuit Always Below 1 V
    RJ-21 (MPX1) - RD-7 (GND2) GR - W-B Multiplex communication signal circuit Engine switch on (IG) Signal waveform
    RK-5 (BECU) - RD-7 (GND2) G-R - W-B ECU power supply (from battery) Always 11 to 14 V
    RL-10 (PKB) - RD-7 (GND2) Y-B - W-B Parking brake switch circuit Parking brake pedal is depressed Below 1 V
    Parking brake pedal is released 11 to 14 V
    A36-4 (HDLO) - RD-7 (GND2)(1) R-W-B Headlight signal (to headlight cleaner relay) Light control switch is OFF 11 to 14 V
    Light control switch is in HEAD Below 1 V
    J75-21 (MPX2) - RD-7 (GND2) GR - W-B Multiplex communication signal circuit Engine switch on (IG) Signal waveform
    (1) w/ Headlight Cleaner
  3. CHECK MAIN BODY ECU LH (COWL SIDE JUNCTION BLOCK LH) 
    Fig 3: Identifying Main Body ECU LH Connector Location
    G05756234Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    CONNECTOR TERMINAL REFERENCE CHART

    Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
    LD-3 (GND) - Body ground W-B - Body ground Ground circuit Always Below 1 V
    LD-8 (SGND) - Body ground W-B - Body ground Signal ground circuit Always Below 1 V
    LD-9 (SGND) - Body ground W-B - Body ground Signal ground circuit Always Below 1 V
    LK-9 (WIG) - LD-3 (GND) L-W-B Front wiper motor power source circuit Engine switch off Below 1 V
    Engine switch on (IG) 11 to 14 V
    LD-18(MPXB) - LD-3 (GND) LG - W-B ECU power supply (from battery) Always 11 to 14 V
    LM-1 (IG) - LD-3 (GND) W-W-B Power source circuit (from battery) Always 11 to 14 V
    A30-1 (S/S) - LD-3 (GND) Y-W-B Front wiper motor power supply circuit (LOW signal) Front wiper switch OFF Below 1 V
    Front wiper switch LOW 11 to 14 V
    A30-2 (+2) - LD-3 (GND) R-L - W-B Front wiper motor power supply circuit (HI signal) Front wiper switch OFF Below 1 V
    Front wiper switch HI 11 to 14 V
    A30-3 (S/M) - LD-3 (GND) G-W-B Front wiper motor operation signal Front wiper is operated 11 to 14 V
    Front wiper is stopped Below 1 V
    A30-17(MPX2) - LD-3 (GND) GR - W-B Multiplex communication signal circuit Engine switch on (IG) Signal waveform
    Q2-11 (2S) - LD-3 (GND) B-W-B Front wiper switch HI signal (to combination switch) Front wiper switch OFF 11 to 14 V
    Front wiper switch HI Below 1 V
    Q3-15(MPX1) - LD-3 (GND) GR - W-B Multiplex communication signal circuit Engine switch on (IG) Signal waveform
  4. CHECK WINDSHIELD WIPER SWITCH ASSEMBLY (COMBINATION SWITCH ECU) 
    Fig 4: Identifying J26 Connector Terminal
    G05756235Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    CONNECTOR TERMINAL REFERENCE CHART

    Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
    J26-1 (B) - J26-5 (E) LG - W-B Power source circuit (from battery) Always 11 to 14 V
    J26-2 (IG) - J26-5 (E) B-W-B IG signal circuit (to IG relay) Engine switch off Below 1 V
    Engine switch on (IG) 11 to 14 V
    J26-3 (2S) - J26-5 (E) G-W-B Wiper switch HI signal Front wiper switch OFF Below 1 V
    Front wiper switch HI 11 to 14 V
    J26-5 (E) - Body ground W-B - Body ground Ground circuit Always Below 1 V
    J26-6(MPX1) - J26-5(E) GR - W-B Multiplex communication signal circuit Engine switch on (IG) Signal waveform
    J26-7 (MPX2) - J26-5 (E) GR - W-B Multiplex communication signal circuit Engine switch on (IG) Signal waveform
  5. CHECK HEADLIGHT CLEANER CONTROL RELAY 
    Fig 5: Identifying A3 Connector Terminal
    G05756236Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    CONNECTOR TERMINAL REFERENCE CHART

    Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
    A3-3(IG) - A3-4(E) Y-W-B Engine switch on (IG) signal (Power source circuit) Engine switch off Below 1 V
    A3-3 (IG) - A3-4 (E) Y-W-B Engine switch on (IG) signal (Power source circuit) Engine switch on (IG) 11 to 14 V
    A3-6 (PB) - A3-4 (E) W-G - W-B Headlight cleaner motor operation signal Headlight cleaner motor is stopped 11 to 14 V
    A3-6(PB) - A3-4(E) W-G - W-B Headlight cleaner motor operation signal Headlight cleaner motor is operating Below 1 V
    A3-1 (HDLO) - A3-4 (E) R-W-B Headlight (Low beam) signal Light control switch is in HEAD Below 1 V
    A3-1 (HDLO) - A3-4 (E) R-W-B Headlight (Low beam) signal Light control switch is OFF 11 to 14 V
    A3-2 (H) - A3-4 (E) R-G - W-B Headlight cleaner switch operation signal Headlight cleaner switch is OFF 11 to 14 V
    A3-2(H) - A3-4(E) R-G - W-B Headlight cleaner switch operation signal Headlight cleaner switch is ON Below 1 V
    A3-4 (E) - Body ground W-B - Body ground Body ground Always Below 1 V
    A3-5 (FRWA) - A3-4 (E) L-O-W-B Front washer motor operation signal Front washer switch is OFF 11 to 14 V
    A3-5 (FRWA) - A3-4 (E) L-O - W-B Front washer motor operation signal Front washer switch is ON Below 1 V
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