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Terminals Of Ecu

WARNING: This page is about a different car, the 2006 Lexus IS 350 and 2006 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK ENGINE ROOM NO. 2 R/B (FRONT CONTROLLER) 
    Fig 1: Identifying Engine Room No. 2 R/B (Front Controller) Terminal And Connector
    G04049336Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    SPECIFIED CONDITION AND TERMINAL DESCRIPTION

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    ALTB (2E-1) - Body ground W - Body ground Power source circuit Always 10 to 14 V
    BATB (2E-2) - Body ground W-L - Body ground Power source circuit Always 10 to 14 V
    FMIG (2E-3) - Body ground B-Y - Body ground Engine switch signal circuit Engine switch on (IG) 10 to 14 V
    FMIG (2E-3) - Body ground B-Y - Body ground Engine switch signal circuit Engine switch off Below 1 V
    FMB3 (2E-4) - Body ground G-R - Body ground Power source circuit Always 10 to 14 V
    E (2F-1) - Body ground W-B - Body ground Ground Always Below 1 V
    MPX1 (2F-5) - Body ground L - Body ground Multiplex communication signal circuit Engine switch on (IG) Signal waveform
    MPX2 (2F-6) - Body ground GR - Body ground Multiplex communication signal circuit Engine switch on (IG) Signal waveform
    FOGR (2G-6) - Body ground LG - Body ground Fog light circuit (To front fog light RH) Front fog light ON 10 to 14 V
    FOGR (2G-6) - Body ground LG - Body ground Fog light circuit (To front fog light RH) Front fog light OFF Below 1 V
    FOGL (2G-7) - Body ground G-R - Body ground Fog light circuit (To front fog light LH) Front fog light ON 10 to 14 V
    FOGL (2G-7) - Body ground G-R - Body ground Fog light circuit (To front fog light LH) Front fog light OFF Below 1 V
    CRAR (2G-8) - Body ground G -Body ground Taillight circuit (To parking light RH) Light control switch on TAIL 10 to 14 V
    CRAR (2G-8) - Body ground G -Body ground Taillight circuit (To parking light RH) Light control switch OFF Below 1 V
    CRAL (2G-9) - Body ground G -Body ground Taillight circuit (To parking light LH) Light control switch on TAIL 10 to 14 V
    CRAL (2G-9) - Body ground G -Body ground Taillight circuit (To parking light LH) Light control switch OFF Below 1 V
    HLHR (2G-12) - Body ground R-W -Body ground Hi-beam circuit (To headlight RH) Headlight dimmer switch on HI 10 to 14 V
    HLHR (2G-12) - Body ground R-W -Body ground Hi-beam circuit (To headlight RH) Headlight dimmer switch on HEAD Below 1 V
    HLHL (2G-13) - Body ground R-Y -Body ground Hi-beam circuit (To headlight LH) Headlight dimmer switch on HI 10 to 14 V
    HLHL (2G-13) - Body ground R-Y -Body ground Hi-beam circuit (To headlight LH) Headlight dimmer switch on HEAD Below 1 V
    (2G-4) - Body ground R-L - Body ground Hi-beam circuit Headlight dimmer switch on HI 10 to 14 V
    (2G-4) - Body ground R-L - Body ground Hi-beam circuit Headlight dimmer switch on HEAD Below 1 V
    (2G-10) - Body ground G-Y - Body ground Taillight circuit (To marker light RH) Light control switch on TAIL 10 to 14 V
    (2G-10) - Body ground G-Y - Body ground Taillight circuit (To marker light RH) Light control switch OFF Below 1 V
    (2G-11) - Body ground BR - Body ground Taillight circuit (To marker light LH) Light control switch on TAIL 10 to 14 V
    (2G-11) - Body ground BR - Body ground Taillight circuit (To marker light LH) Light control switch OFF Below 1 V
  2. CHECK MAIN BODY ECU RH (COWL SIDE J/B RH) 
    Fig 2: Identifying Main Body ECU RH (COWL SIDE J/B RH) Terminal And Connector
    G04049337Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    SPECIFIED CONDITION AND TERMINAL DESCRIPTION

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    GND2 (RD-7) - Body ground W-B - Body ground Ground Always Below 1 V
    LCTY (RA-11) - Body ground BR - Body ground Illumination signal (From door courtesy switch rear LH) Rear LH door is closed 10 to 14 V
    LCTY (RA-11) - Body ground BR - Body ground Illumination signal (From door courtesy switch rear LH) Rear LH door is open Below 1 V
    MPX1 (RA-20) - Body ground GR - Body ground Multiplex communication signal circuit Engine switch on (IG) Signal waveform
    BECU (RK-5) - Body ground G-R - Body ground Multiplex communication power source circuit Always 10 to 14 V
    HRLY (RL-7) - Body ground R-W - Body ground HEAD signal (To HEAD relay) Light control switch OFF or in TAIL 10 to 14 V
    HRLY (RL-7) - Body ground R-W - Body ground HEAD signal (To HEAD relay) Light control switch in HEAD Below 1 V
    DCTY (P1-14) - Body ground W - Body ground Illumination signal (From driver side courtesy switch) Driver's side door is closed 10 to 14 V
    DCTY (P1-14) - Body ground W - Body ground Illumination signal (From driver side courtesy switch) Driver's side door is open Below 1 V
    RCTY (P1-16) - Body ground O - Body ground Illumination signal (From door courtesy switch rear RH) Rear RH door is closed 10 to 14 V
    RCTY (P1-16) - Body ground O - Body ground Illumination signal (From door courtesy switch rear RH) Rear RH door is open Below 1 V
    FSPT (J75-15) - Body ground R - Body ground Illumination signal (To footwell lights) Footwell lights come on Below 1 V
    FSPT (J75-15) - Body ground R - Body ground Illumination signal (To footwell lights) Footwell lights go off 10 to 14 V
    MPX2 (J75-21) - Body ground GR - Body ground Multiplex communication signal circuit Engine switch on (IG) Signal waveform
    CLTE (J74-4) - Body ground W - Body ground Automatic light control sensor ground circuit Always Below 1 V
    CLTS (J74-5) - Body ground R - Body ground Automatic light control sensor ground circuit Engine switch off Below 1 V
    CLTS (J74-5) - Body ground R - Body ground Automatic light control sensor ground circuit Engine switch on (IG), light control switch on AUTO, headlight comes ON Signal waveform
    CLTB (J74-6) - Body ground GR - Body ground Automatic light control sensor power source circuit Engine switch off Below 1 V
    CLTB (J74-6) - Body ground GR - Body ground Automatic light control sensor power source circuit Engine switch on (IG) 10 to 14 V
    HEAD (J74-23) - Body ground L - Body ground HEAD signal (From light control switch) Light control switch OFF or on TAIL 10 to 14 V
    HEAD (J74-23) - Body ground L - Body ground HEAD signal (From light control switch) Light control switch in HEAD Below 1 V
    ALTB (RA-15) - Body ground SB - Body ground Power source circuit Always 10 to 14 V
    UL2 (J75-4) - Body ground O - Body ground Interior light switch (ON / OFF) signal Interior light switch ON Below 1 V
    UL2 (J75-4) - Body ground O - Body ground Interior light switch (ON / OFF) signal Interior light switch OFF 10 to 14 V
    TRLY (RD-1) - Body ground Y - Body ground HAED signal (to HAED relay) Light control switch OFF 10 to 14 V
    TRLY (RD-1) - Body ground Y - Body ground HAED signal (to HAED relay) Light control switch in TAIL Below 1 V
    PCYL (J75-24) - Body ground Y - Body ground Illumination signal (From door courtesy light front LH) Passenger's side door is open Below 1 V
    PCYL (J75-24) - Body ground Y - Body ground Illumination signal (From door courtesy light front LH) Passenger's side door is closed 10 to 14 V
    DCYL (P1-13) - Body ground G - Body ground Illumination signal (From door courtesy light front RH) Driver's side door is open Below 1 V
    DCYL (P1-13) - Body ground G - Body ground Illumination signal (From door courtesy light front RH) Driver's side door is closed 10 to 14 V
    LGCY (J75-25) - Body ground L - Body ground Illumination signal (From door courtesy switch luggage) Luggage door is open Below 1 V
    LGCY (J75-25) - Body ground L - Body ground Illumination signal (From door courtesy switch luggage) Luggage door is closed 10 to 14 V
    PCTY (J75-23) - Body ground B - Body ground Illumination signal (From door courtesy switch front LH) Passenger's side door is open Below 1 V
    PCTY (J75-23) - Body ground B - Body ground Illumination signal (From door courtesy switch front LH) Passenger's side door is closed 10 to 14 V
    HAZ (J74-2) - Body ground Y - Body ground HAZARD signal (From HAZARD switch) HAZARD switch ON Below 1 V
    HAZ (J74-2) - Body ground Y - Body ground HAZARD signal (From HAZARD switch) HAZARD switch OFF 10 to 14 V
  3. CHECK MAIN BODY ECU LH 
    Fig 3: Identifying Main Body ECU LH Terminal And Connector
    G04049338Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    SPECIFIED CONDITION AND TERMINAL DESCRIPTION

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    GND (LD-3) - Body ground W-B - Body ground Ground Always Below 1 V
    TR (LA-15) - Body ground P - Body ground RH side turn signal (To turn signal flasher assembly) Engine switch off Below 1 V
    TR (LA-15) - Body ground P - Body ground RH side turn signal (To turn signal flasher assembly) Engine switch on (IG) and turn signal switch (right turn) ON 10 to 14 V (60 to 120 times per minute)
    TL (LA-16) - Body ground BR - Body ground LH side turn signal (To turn signal flasher assembly) Engine switch off Below 1 V
    TL (LA-16) - Body ground BR - Body ground LH side turn signal (To turn signal flasher assembly) Engine switch on (IG) and turn signal switch (left turn) ON 10 to 14 V (60 to 120 times per minute)
    SGND (LD-8) - Body ground W-B - Body ground Ground Always Below 1 V
    SGND (LD-9) - Body ground W-B - Body ground Ground Always Below 1 V
    MPXB (LD-18) - Body ground LG - Body ground Multiplex communication power source circuit Always 10 to 14 V
    ILE (Q1-2) - 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
    ILE (Q1-2) - Body ground V - Body ground Illumination signal (To front interior light) Interior light switch in DOOR position and interior lights goes off 10 to 14 V
    RCTY (Q1-3) - Body ground R - Body ground Illumination signal (To shift illumination) Shift illumination come on Below 1 V
    RCTY (Q1-3) - Body ground R - Body ground Illumination signal (To shift illumination) Shift illumination goes off 10 to 14 V
    LCTY (Q1-4) - Body ground LG - Body ground Illumination signal (To door mirror foot light) Door mirror foot lights come on 10 to 14 V
    MPX1 (Q3-15) - Body ground GR - Body ground Multiplex communication signal circuit Engine switch on (IG) Signal waveform
    MPX2 (A30-17) - Body ground GR - Body ground Multiplex communication signal circuit Engin switch on (IG) Signal waveform
    ILE1 (LA-19) - Body ground W - Body ground Illumination signal (to scuff plate light) Room light switch in DOOR position and scuff plate lights come on Below 1 V
    ILE1 (LA-19) - Body ground W - Body ground Illumination signal (to scuff plate light) Room light switch in DOOR position and scuff plate lights come off 10 to 14 V
    LGCY (Q3-3) - Body ground W - Body ground Illumination signal (to seat illumination) Seat illumination come on Below 1 V
    LGCY (Q3-3) - Body ground W - Body ground Illumination signal (to seat illumination) Seat illumination come off 10 to 14 V
    BDCY (Q3-11) - Body ground P - Body ground Interior light switch (Door) signal Interior light switch on Below 1 V
    BDCY (Q3-11) - Body ground P - Body ground Interior light switch (Door) signal Interior light switch off 10 to 14 V
  4. CHECK COMBINATION SWITCH ASSEMBLY (Windshield Wiper Switch) 
    Fig 4: Identifying Combination Switch Assembly (Windshield Wiper Switch) Terminal And Connector
    G04049339Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    SPECIFIED CONDITION AND TERMINAL DESCRIPTION

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    B (J26-1) - E (J26-5) LG - W-B Power source circuit (From battery) Always 10 to 14 V
    IG (J26-2) - E (J26-5) B - W-B Engine switch signal circuit (From engine switch) Engine switch off Below 1 V
    IG (J26-2) - E (J26-5) B - W-B Engine switch signal circuit (From engine switch) Engine switch on (IG) 10 to 14 V
    HEAD (J26-4) - Body ground L - Body ground Light control switch HEAD signal Light control switch not on HEAD 10 to 14 V
    HEAD (J26-4) - Body ground L - Body ground Light control switch HEAD signal Light control switch on HEAD Below 1 V
    E (J26-5) - Body ground W-B - Body ground Ground Always Below 1 V
    MPX1 (J26-6) - Body ground GR - Body ground Multiplex communication signal circuit Engine switch on (IG) Signal waveform
    MPX2 (J26-7) - Body ground GR - Body ground Multiplex communication signal circuit Engine switch on (IG) Signal waveform
  5. CHECK OVERHEAD J/B 
    Fig 5: Identifying Overhead J/B Connector Terminals
    G04049340Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    SPECIFIED CONDITION AND TERMINAL DESCRIPTION

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    +B1 (R5-1) - Body ground L - Body ground Power source circuit Always 10 to 14 V
    RRMP (R5-3) - Body ground O - Body ground Rear personal light power source circuit Always 10 to 14 V
    ILLB (R5-4) - Body ground L - Body ground Rear interior light power source circuit Always 10 to 14 V
    CTY (R5-12) - Body ground W - Body ground Seat illumination light circuit Seat illumination comes off 10 to 14 V
    CTY (R5-12) - Body ground W - Body ground Seat illumination light circuit Seat illumination comes on Below 1 V
    ILL (R5-13) - Body ground BR - Body ground Interior light circuit Interior lights come off 10 to 14 V
    ILL (R5-13) - Body ground BR - Body ground Interior light circuit Interior lights come on Below 1 V
    SHFT (R5-14) - Body ground Y - Body ground Shift illumination circuit Shift illumination comes off 10 to 14 V
    SHFT (R5-14) - Body ground Y - Body ground Shift illumination circuit Shift illumination comes on Below 1 V
    GND3 (R5-18) - Body ground W-B - Body ground Ground Always Below 1 V
    RGND (R5-19) - GND3 (R5-18) W-B - W-B Interior light ground Always Below 1 V
    LILL (R5-32) - CTY (R5-12) B - W Seat illumination circuit Always Below 1 Ω
    RILL (R5-33) - ILL (R5-13) P - BR Interior light circuit Always Below 1 Ω
    CILL (R5-34) - GND3 (R5-18) P - W-B Interior light switch (ON/OFF) circuit Interior light switch off 10 to 14 V
    CILL (R5-34) - GND3 (R5-18) P - W-B Interior light switch (ON/OFF) circuit Interior light switch on Below 1 V
    DOOR (R5-35) - GND3 (R5-18) G - W-B Interior light switch (DOOR) circuit Interior light switch off 10 to 14 V
    DOOR (R5-35) - GND3 (R5-18) G - W-B Interior light switch (DOOR) circuit Interior light switch on Below 1 V
    MPX (R5-36) - Body ground GR - Body ground Multiplex communication signal circuit Engine switch is on (IG) Signal waveform
  6. CHECK AFS ECU 
    Fig 6: Identifying AFS ECU Connector Terminal
    G04049341Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    SPECIFIED CONDITION AND TERMINAL DESCRIPTION

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    SBF (A28-1) - SGF (A28-17) R-B - G-R Vehicle height signal (To height control sensor) Engine switch off Below 1 V
    Engine switch on (IG) 4.5 V to 5.5 V
    SPDL (A28-6) - E1 (A27-1) R-L - W-B Vehicle speed signal (To skid control ECU) Vehicle is driving at approx. 30 km/h (19 mph) Pulse generation (see waveform 1)
    SPDR (A28-7) - E1 (A27-1) G-W - W-B Vehicle speed signal (To skid control ECU) Vehicle is driving at approx. 30 km/h (19 mph) Pulse generation (see waveform 1)
    BR1+ (A28-9) - BR1-(A28-10) LG-R - O Headlight swivel motor RH Engine switch off Below 1 V
    Engine running, light control switch in HEAD, driving at more than 10 km/h (6 mph) and turning the steering wheel more than 7.5° Pulse generation (see waveform 2)
    BR2+ (A28-11) - BR2-(A28-12) L-B - L-Y Headlight swivel motor RH Engine Switch off Below 1 V
    Engine running, light control switch in HEAD, driving at more than 10 km/h (6 mph) and turning the steering wheel more than 7.5° Pulse generation (see waveform 2)
    LR1+ (A28-13) - LR1-(A28-14) L - BR-W Headlight leveling actuator RH Engine Switch off Below 1 V
    Engine running, light control switch in HEAD, the vehicle is standing still or bounding Pulse generation (see waveform 3)
    LR2+ (A28-15) - LR2-(A28-16) P - LG Headlight leveling actuator RH Engine Switch off Below 1 V
    Engine running, light control switch in HEAD, the vehicle is standing still or bounding Pulse generation (see waveform 3)
    SGF (A28-17) - E1 (A27-1) G-R - W-B Vehicle height signal (To height control sensor) Always Below 1 V
    SMGR (A28-18) - E1 (A27-1) W-R - W-B Headlight swivel motor RH Always Below 1 V
    SMGL (A28-19) - E1 (A27-1) P-G - W-B Headlight swivel motor LH Always Below 1 V
    SMBR (A28-21) - SMGR (A28-18) GR - W-R Headlight swivel motor RH Engine switch off Below 1 V
    Engine switch on (IG) 4.5 V to 5.5 V
    SMBL (A28-22) - SMGL (A28-19) W - P-G Headlight swivel motor LH Engine switch off Below 1 V
    Engine switch on (IG) 4.5 V to 5.5 V
    SMR (A28-23) - SMGR (A28-18) G-B - W-R Headlight swivel motor RH Engine switch off Below 1 V
    Engine switch on (IG) 0.3 V to 4.6 V
    SML (A28-24) - SMGL (A28-19) Y-B - P-G Headlight swivel motor LH Engine switch off Below 1 V
    Engine switch on (IG) 0.3 V to 4.6V
    BL1+ (A28-25) - BL1-(A28-26) B-L - L-W Headlight swivel motor LH Engine switch off Below 1 V
    Engine running, light control switch in HEAD, driving at more than 10 km/h (6 mph) and turning the steering wheel to left more than 7.5° Pulse generation (see waveform 2)
    BL2+ (A28-27) - BL2-(A28-28) L-R - B-Y Headlight swivel motor LH Engine Switch off Below 1 V
    Engine running, light control switch in HEAD, driving at more than 10 km/h (6 mph) and turning the steering wheel to left more than 7.5° Pulse generation (see waveform 2)
    LL1+ (A28-29) - LL1-(A28-30) R-G - G Headlight leveling actuator LH Engine Switch off Below 1 V
    Engine running, light control switch in HEAD, the vehicle is still or bounced Pulse generation (see waveform 3)
    LL2+ (A28-31) - LL2-(A28-32) Y-R - V-R Headlight leveling actuator LH Engine switch off Below 1 V
    Engine running, light control switch in HEAD, the vehicle is still or bounced Pulse generation (see waveform 3)
    E1 (A27-1) - Body ground W-B - Body ground Ground Always Below 1 V
    IG (A27-2) - E1 (A27-1) B-O - W-B Power source circuit (To engine switch) Engine switch off Below 1 V
    Engine switch on (IG) 10 to 14 V
    MPX1 (A27-5) - E1 (A27-1) G-R - W-B Multiplex communication signal Engine switch on (IG) Signal waveform
    MPX2 (A27-6) - E1 (A27-1) GR-L - W-B Multiplex communication signal Engine switch on (IG) Signal waveform
    SS+ (A27-7) -SS- (A27-8) L - LG Steering sensor signal (To position sensor) Engine idling, slowly turn steering wheel Pulse generation
    SHRL (A27-9) - SGR (A27-20) B-W - R-Y Vehicle height signal (To height control sensor rear) Engine switch off Below 1 V
    Engine switch on (IG), bouncing the vehicle 0.5 to 4.5 V
    SHFL (A28-2) - SGF (A28-17) G-Y - G-R Vehicle height signal (To height control sensor front) Engine Switch off Below 1 V
    Engine Switch on (IG), bouncing the vehicle 0.5 to 4.5 V
    SBR (A27-10) - SGR (A27-20) W - R-Y Vehicle height signal (To height control sensor rear) Engine switch off Below 1 V
    Engine switch on (IG) 4.5 to 5.5 V
    SBF (A28-1) - SGF (A28-17) R-B - GR Vehicle height signal (To height control sensor front) Engine switch off Below 1 V
    Engine switch on (IG) 4.5 to 5.5 V
    1. Waveform 1
      ITEM CONTENT

      Item Contents
      Terminal SPDL - GND
      SPDR - GND
      Tool setting 5 V/DIV., 2 ms./DIV.
      Vehicle condition Vehicle is driving at approximately 30 km/h (19 mph)
      Fig 7: Signal Waveform Graph (Waveform 1)
      G04049342Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    2. Waveform 2
      ITEM CONTENT

      Item Contents
      Terminal BL1+ - BL1-
      BL2+ - BL2-
      BR1+ - BR1-
      BR2+ - BR2-
      Tool setting 10 V/DIV., 5 ms./DIV.
      Vehicle condition
      • Engine running, light control switch in HEAD, driving at more than 10 km/h (6 mph) and turning the steering wheel more than 7.5°
      • If the value is not within the standard range, it is possible there is some defect on the vehicle side. Inspect the fuse, wire harness and connector.
      Fig 8: Signal Waveform Graph (Waveform 2)
      G04049343Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    3. Waveform 3
    ITEM CONTENT

    Item Contents
    Terminal LR1+ - LR1-
    LR2+ - LR2-
    LL1+ - LL1-
    LL2+ - LL2-
    Tool setting 10 V/DIV., 5 ms./DIV.
    Fig 9: Signal Waveform Graph (Waveform 3)
    G04049344Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    ITEM CONTENT

    Item Contents
    Vehicle condition
    • Engine running, light control switch in HEAD, driving at more than 10 km/h (6 mph) and turning the steering wheel more than 7.5°
    • If the value is not within the standard range, it is possible there is some defect on the vehicle side. Inspect the fuse, wire harness and connector.
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