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Terminals Of Ecu

  1. CHECK ENGINE ROOM NO. 2 R/B (FRONT CONTROLLER) 
    Fig 1: Identifying Engine Room No 2 R/B (Front Controller) Terminal And Connector
    G05320268Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TERMINALS REFERENCE CHART

    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 tight 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 in 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 in 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 in HI 10 to 14 V
    HLHR (2G-12) - Body ground R-W - Body ground Hi-beam circuit (To headlight RH) Headlight dimmer switch in HEAD Below 1 V
    HLHL (2G-13) - Body ground R-Y - Body ground Hi-beam circuit (To headlight LH) Headlight dimmer switch in HI 10 to 14 V
    HLHL (2G-13) - Body ground R-Y - Body ground Hi-beam circuit (To headlight LH) Headlight dimmer switch in HEAD Below 1 V
    (2G-4) - Body ground R-L - Body ground Hi-beam circuit Headlight dimmer switch in HI 10 to 14 V
    (2G-4) - Body ground R-L - Body ground Hi-beam circuit Headlight dimmer switch in HEAD Below 1 V
    (2G-10) - Body ground G-Y - Body ground Taillight circuit (To marker light RH) Light control switch in 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 in 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
    G05320269Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TERMINALS REFERENCE CHART

    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 0 - Body ground Illumination signal (From door courtesy switch rear RH) Rear RH door is closed 10 to 14 V
    RCTY (P1-16) - Body ground 0 - 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), lights control switch in AUTO, headlights come 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 in 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 luggage door courtesy switch) Luggage door is open Below 1 V
    LGCY (J75-25) - Body ground L - Body ground Illumination signal (From luggage door courtesy switch) 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
    G05320270Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TERMINALS REFERENCE CHART

    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 go off 10 to 14 V
    RCTY (Q1-3) - Body ground R - Body ground Illumination signal (To shift Illumination) Shift Illumination comes 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 Engine 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 go off 10 to 14 V
    LGCY (Q3-3) - Body ground W - Body ground Illumination signal (to seat illumination) Seat illumination comes on Below 1 V
    LGCY (Q3-3) - Body ground W - Body ground Illumination signal (to seat illumination) Seat illumination goes 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) Connector Terminals
    G05320271Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TERMINALS REFERENCE CHART

    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 in HEAD 10 to 14 V
    HEAD (J26-4) - Body ground L - Body ground Light control switch HEAD signal Light control switch in 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
    G05320272Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TERMINALS REFERENCE CHART

    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 goes 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 go 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 goes 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 on (IG) Signal waveform
  6. CHECK AFS ECU 
    Fig 6: Identifying AFS ECU Connector Terminal
    G05320273Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TERMINALS REFERENCE CHART

    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
    PDL (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  awaveform 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  awaveform 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 to right more than 7.5° Pulse generation (see  bwaveform 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  bwaveform 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 bouncing Pulse generation (see  cwaveform 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 bouncing Pulse generation (see  cwaveform 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-D P-G - W-B Headlight swivel motor LH Always Below 1V
    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  bwaveform 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  bwaveform 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 standing still or bouncing Pulse generation (see  cwaveform 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 standing still or bouncing Pulse generation (see  cwaveform 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
      WAVEFORM REFERENCE

      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: Identifying Waveform 1
      G05320274Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Waveform 2
      WAVEFORM REFERENCE

      Item Contents
      Terminal BL1 +- BL1-
      BL2+ - BL2-
      BR1 +- BR1-
      BR2+ - BR2-
      Tool setting 10V/DIV., 5ms./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.
    3. Waveform 3
      Fig 8: Identifying Waveform 2
      G05320275Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 9: Identifying Waveform 3
      G05320276Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      WAVEFORM REFERENCE

      Item Contents
      Terminal LR1 +- LR1-
      LR2+ - LR2-
      LL1 +- LL1-
      LL2+ - LL2-
      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.
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