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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 MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH) 
    Fig 1: Identifying Main Body ECU RH (Cowl Side Junction Block RH)
    G05754595Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TERMINAL DESCRIPTION SPECIFIED CONDITION CHART

    Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
    RD-7 (GND2) - Body ground W-B - Body ground Ground Always Below 1 V
    RA-11 (LCTY) - Body ground BR - Body ground Illumination signal (From rear door courtesy switch LH) Rear LH door is closed 11 to 14 V
    RA-11 (LCTY) - Body ground BR - Body ground Illumination signal (From rear door courtesy switch LH) Rear LH door is open Below 1 V
    RA-20 (MPX1) - Body ground GR - Body ground Multiplex communication signal circuit Engine switch on (IG) Signal waveform
    RK-5 (BECU) - Body ground G-R - Body ground Multiplex communication power source circuit Always 11 to 14 V
    P1-14 (DCTY) - Body ground W - Body ground Illumination signal (From driver side courtesy switch) Driver's side door is closed 11 to 14 V
    P1-14 (DCTY) - Body ground W - Body ground Illumination signal (From driver side courtesy switch) Driver's side door is open Below 1 V
    P1-16 (RCTY) - Body ground O - Body ground Illumination signal (From rear door courtesy switch RH) Rear RH door is closed 11 to 14 V
    P1-16 (RCTY) - Body ground O - Body ground Illumination signal (From rear door courtesy switch RH) Rear RH door is open Below 1 V
    J75-15 (FSPT) - Body ground R - Body ground Illumination signal (To footwell lights) Footwell lights come on Below 1 V
    J75-15 (FSPT) - Body ground R - Body ground Illumination signal (To footwell lights) Footwell lights go off 11 to 14 V
    J75-21 (MPX2) - Body ground GR - Body ground Multiplex communication signal circuit Engine switch on (IG) Signal waveform
    RA-15 (ALTB) - Body ground SB - Body ground Power source circuit Always 11 to 14 V
    J75-4 (UL2) - Body ground O - Body ground Interior light switch (ON/OFF) signal Interior light switch on Below 1 V
    J75-4 (UL2) - Body ground O - Body ground Interior light switch (ON/OFF) signal Interior light switch off 11 to 14 V
    J75-24 (PCYL) - Body ground Y - Body ground Illumination signal (From front door courtesy light LH) Passenger's side door is open Below 1 V
    J75-24 (PCYL) - Body ground Y - Body ground Illumination signal (From front door courtesy light LH) Passenger's side door is closed 11 to 14 V
    P1-13 (DCYL) - Body ground G - Body ground Illumination signal (From front door courtesy light RH) Driver's side door is open Below 1 V
    P1-13 (DCYL) - Body ground G - Body ground Illumination signal (From front door courtesy light RH) Driver's side door is closed 11 to 14 V
    J75-25 (LGCY) - Body ground L - Body ground Illumination signal (From luggage door courtesy switch) Luggage door is open Below 1 V
    J75-25 (LGCY) - Body ground L - Body ground Illumination signal (From luggage door courtesy switch) Luggage door is closed 11 to 14 V
    J75-23 (PCTY) - Body ground B - Body ground Illumination signal (From front door courtesy switch LH) Passenger's side door is open Below 1 V
    J75-23 (PCTY) - Body ground B - Body ground Illumination signal (From front door courtesy switch LH) Passenger's side door is closed 11 to 14 V
  2. CHECK MAIN BODY ECU LH (COWL SIDE JUNCTION BLOCK LH) 
    Fig 2: Identifying Main Body ECU LH (Cowl Side Junction Block LH)
    G05754596Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TERMINAL DESCRIPTION SPECIFIED CONDITION CHART

    Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
    LD-3 (GND) - Body ground W-B - Body ground Ground Always Below 1 V
    LD-8 (SGND) - Body ground W-B - Body ground Ground Always Below 1 V
    LD-9 (SGND) - Body ground W-B - Body ground Ground Always Below 1 V
    LD-18 (MPXB) - Body ground LG - Body ground Multiplex communication power source circuit Always 11 to 14 V
    Q1-2 (ILE)- Body ground V - Body ground Illumination signal (To front interior light) Interior light switch in DOOR position and interior lights come on Below 1 V
    Q1-2 (ILE) - Body ground V - Body ground Illumination signal (To front interior light) Interior light switch in DOOR position and interior lights go off 11 to 14 V
    Q1-3 (RCTY) - Body ground R - Body ground Illumination signal (To shift illumination) Shift illumination comes on Below 1 V
    Q1-3 (RCTY) - Body ground R - Body ground Illumination signal (To shift illumination) Shift illumination goes off 11 to 14 V
    Q1-4 (LCTY) - Body ground LG - Body ground Illumination signal (To door mirror foot light) Door mirror foot lights come on 11 to 14 V
    Q3-15 (MPX1) - Body ground GR - Body ground Multiplex communication signal circuit Engine switch on (IG) Signal waveform
    A30-17 (MPX2) - Body ground GR - Body ground Multiplex communication signal circuit Engine switch on (IG) Signal waveform
    Q3-3 (LGCY) - Body ground W - Body ground Illumination signal (to seat illumination) Seat illumination comes on Below 1 V
    Q3-3 (LGCY) - Body ground W - Body ground Illumination signal (to seat illumination) Seat illumination goes off 11 to 14 V
    Q3-11 (BDCY) - Body ground P - Body ground Interior light switch (Door) signal Interior light switch on Below 1 V
    Q3-11 (BDCY) - Body ground P - Body ground Interior light switch (Door) signal Interior light switch off 11 to 14 V
  3. CHECK OVERHEAD JUNCTION BLOCK 
    Fig 3: Identifying Overhead Junction Block Connector Terminals
    G05754597Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TERMINAL DESCRIPTION SPECIFIED CONDITION CHART

    Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
    R5-1 (+B1) - Body ground L - Body ground Power source circuit Always 11 to 14 V
    R5-3 (RRMP) - Body ground O - Body ground Rear personal light power source circuit Always 11 to 14 V
    R5-4 (ILLB) - Body ground L - Body ground Rear interior light power source circuit Always 11 to 14 V
    R5-12 (CTY) - Body ground W - Body ground Seat illumination light circuit Seat illumination goes off 11 to 14 V
    R5-12 (CTY) - Body ground W - Body ground Seat illumination light circuit Seat illumination comes on Below 1 V
    R5-13 (ILL) - Body ground BR - Body ground Interior light circuit Interior lights go off 11 to 14 V
    R5-13 (ILL) - Body ground BR - Body ground Interior light circuit Interior lights come on Below 1 V
    R5-14 (SHFT) - Body ground Y - Body ground Shift illumination circuit Shift illumination goes off 11 to 14 V
    R5-14 (SHFT) - Body ground Y - Body ground Shift illumination circuit Shift illumination comes on Below 1 V
    R5-18 (GND3) - Body ground W-B - Body ground Ground Always Below 1 V
    R5-19 (RGND) - R5-18 (GND3) W-B - W-B Interior light ground Always Below 1 V
    R5-32 (LILL) - R5-12 (CTY) B - W Seat illumination circuit Always Below 1 Ω
    R5-33 (RILL) - R5-13 (ILL) P - BR Interior light circuit Always Below 1 Ω
    R5-34 (CILL) - R5-18 (GND3) P - W-B Interior light switch (ON/OFF) circuit Interior light switch off 11 to 14 V
    R5-34 (CILL) - R5-18 (GND3) P - W-B Interior light switch (ON/OFF) circuit Interior light switch on Below 1 V
    R5-35 (DOOR) - R5-18 (GND3) G - W-B Interior light switch (DOOR) circuit Interior light switch off 11 to 14 V
    R5-35 (DOOR) - R5-18 (GND3) G - W-B Interior light switch (DOOR) circuit Interior light switch on Below 1 V
    R5-36 (MPX) - Body ground GR - Body ground Multiplex communication signal circuit Engine switch on (IG) Signal waveform
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