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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 (Multiplex Network Body ECU) Connector Terminal
    G05756382Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    CONNECTOR TERMINAL REFERENCE

    Terminal No Wiring Color Terminal Description Condition Specified Condition
    2E-1 - Body ground W - Body ground Power source circuit Always 11 to 14 V
    2E-2 - Body ground W-L - Body ground Power source circuit Always 11 to 14 V
    2E-3 - Body ground B-Y - Body ground Engine switch signal circuit Engine switch on (IG) 11 to 14 V
    2E-3 - Body ground B-Y - Body ground Engine switch signal circuit Engine switch off Below 1 V
    2E-4 - Body ground G-R - Body ground Power source circuit Always 11 to 14 V
    2F-1 - Body ground W-B - Body ground Ground Always Below 1 V
    2F-5 - Body ground L - Body ground Multiplex communication signal circuit Engine switch on (IG) Signal waveform
    2F-6 - Body ground GR - Body ground Multiplex communication signal circuit Engine switch on (IG) Signal waveform
    2G-6 - Body ground LG - Body ground Fog light circuit (To front fog light RH) Front fog light ON 11 to 14 V
    2G-6 - Body ground LG - Body ground Fog light circuit (To front fog light RH) Front fog light OFF Below 1 V
    2G-7 - Body ground G-R - Body ground Fog light circuit (To front fog light LH) Front fog light ON 11 to 14 V
    2G-7 - Body ground G-R - Body ground Fog light circuit (To front fog light LH) Front fog light OFF Below 1 V
    2G-8 - Body ground G - Body ground Taillight circuit (To parking light RH) Light control switch in TAIL 11 to 14 V
    2G-8 - Body ground G - Body ground Taillight circuit (To parking light RH) Light control switch OFF Below 1 V
    2G-9 - Body ground L - Body ground Taillight circuit (To parking light LH) Light control switch in TAIL 11 to 14 V
    2G-9 - Body ground L - Body ground Taillight circuit (To parking light LH) Light control switch OFF Below 1 V
    2G-12-Body ground R-W - Body ground Hi-beam circuit (To headlight RH) Headlight dimmer switch in HI 11 to 14 V
    2G-12-Body ground R-W - Body ground Hi-beam circuit (To headlight RH) Headlight dimmer switch in HEAD Below 1 V
    2G-13-Body ground R-Y - Body ground Hi-beam circuit (To headlight LH) Headlight dimmer switch in HI 11 to 14 V
    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 11 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 11 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 11 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 JUNCTION BLOCK RH) 
    Fig 2: Identifying Main Body ECU RH Connector Terminal (Cowl Side Junction Block RH)
    G05756383Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    CONNECTOR TERMINAL REFERENCE

    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-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
    RL-7 (HRLY) - Body ground R-W - Body ground HEAD signal (To HEAD relay) Light control switch OFF or in TAIL 11 to 14 V
    RL-7 (HRLY) - Body ground R-W - Body ground HEAD signal (To HEAD relay) Light control switch in HEAD Below 1 V
    J75-21 (MPX2) - Body ground GR - Body ground Multiplex communication signal circuit Engine switch on (IG) Signal waveform
    J74-4 (CLTE) - Body ground W - Body ground Automatic light control sensor ground circuit Always Below 1 V
    J74-5 (CLTS) - Body ground R - Body ground Automatic light control sensor ground circuit Engine switch off Below 1 V
    J74-5 (CLTS) - 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
    J74-6 (CLTB) - Body ground GR - Body ground Automatic light control sensor power source circuit Engine switch off Below 1 V
    J74-6 (CLTB) - Body ground GR - Body ground Automatic light control sensor power source circuit Engine switch on (IG) 11 to 14 V
    J74-23 (HEAD) - Body ground L - Body ground HEAD signal (From light control switch) Light control switch OFF or in TAIL 11 to 14 V
    J74-23 (HEAD) - Body ground L - Body ground HEAD signal (From light control switch) Light control switch in HEAD Below 1 V
    RA-15 (ALTB) - Body ground SB - Body ground Power source circuit Always 11 to 14 V
    RD-1 (TRLY) - Body ground Y - Body ground HEAD signal (to HEAD relay) Light control switch OFF 11 to 14 V
    RD-1 (TRLY) - Body ground Y - Body ground HEAD signal (to HEAD relay) Light control switch in TAIL Below 1 V
    J74-2 (HAZ) - Body ground Y - Body ground Hazard signal (From hazard switch) Hazard switch ON Below 1 V
    J74-2 (HAZ) - Body ground Y - Body ground Hazard signal (From hazard switch) Hazard switch OFF 11 to 14 V
  3. CHECK MAIN BODY ECU LH (COWL SIDE JUNCTION BLOCK LH) 
    Fig 3: Identifying Main Body ECU LH Connector Terminal (Cowl Side Junction Block LH)
    G05756384Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    CONNECTOR TERMINAL REFERENCE

    Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
    LD-3 (GND) - Body ground W-B - Body ground Ground Always Below 1 V
    LA-15 (TR) - Body ground P - Body ground RH side turn signal (To turn signal flasher assembly) Engine switch off Below 1 V
    LA-15 (TR) - Body ground P - Body ground RH side turn signal (To turn signal flasher assembly) Engine switch on (IG) and turn signal switch (right turn) off 11 to 14 V
    LA-16 (TL) - Body ground BR - Body ground LH side turn signal (To turn signal flasher assembly) Engine switch off Below 1 V
    LA-16 (TL) - Body ground BR - Body ground LH side turn signal (To turn signal flasher assembly) Engine switch on (IG) and turn signal switch (left turn) off 11 to 14 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
    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
  4. CHECK WINDSHIELD WIPER SWITCH ASSEMBLY 
    Fig 4: Identifying Windshield Wiper Switch Assembly Connector Terminal
    G05756385Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    CONNECTOR TERMINAL REFERENCE

    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 Engine switch signal circuit (From engine switch) Engine switch off Below 1 V
    J26-2 (IG) - J26-5 (E) B - W-B Engine switch signal circuit (From engine switch) Engine switch on (IG) 11 to 14 V
    J26-4 (HEAD) - Body ground L - Body ground Light control switch HEAD signal Light control switch not in HEAD 11 to 14 V
    J26-4 (HEAD) - Body ground L - Body ground Light control switch HEAD signal Light control switch in HEAD Below 1 V
    J26-5 (E) - Body ground W-B - Body ground Ground Always Below 1 V
    J26-6 (MPX1) - Body ground GR - Body ground Multiplex communication signal circuit Engine switch on (IG) Signal waveform
    J26-7 (MPX2) - Body ground GR - Body ground Multiplex communication signal circuit Engine switch on (IG) Signal waveform
  5. CHECK AFS ECU 
    Fig 5: Identifying AFS ECU Connector Terminal
    G05756386Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    CONNECTOR TERMINAL REFERENCE

    Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
    A28-1 (SBF) - A28-17 (SGF) R-B - G-R Vehicle height signal (To height control sensor) Engine switch off Below 1 V
    Engine switch on (IG) 4 5 to 5 5 V
    A28-6 (SPDL) - A27-1 (E1) 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)
    A28-7 (SPDR) - A27-1 (E1) 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)
    A28-9 (BR1+) - A28-10 (BR1-) LG-R - P-B 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)
    A28-11 (BR2+) - A28-12 (BR2-) 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)
    A28-13 (LR1+) - A28-14 (LR1-) 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)
    A28-15 (LR2+) - A28-16 (LR2-) 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)
    A28-17 (SGF) - A27-1 (E1) G-R - W-B Vehicle height signal (To height control sensor) Always Below 1 V
    A28-18 (SMGR) - A27-1 (E1) W-R - W-B Headlight swivel motor RH Always Below 1 V
    A28-19 (SMGL) - A27-1 (E1) P-G - W-B Headlight swivel motor LH Always Below 1 V
    A28-21 (SMBR) - A28-18 (SMGR) GR - W-R Headlight swivel motor RH Engine switch off Below 1 V
    Engine switch on (IG) 4 5 to 5 5 V
    A28-22 (SMBL) - A28-19 (SMGL) W-P-G Headlight swivel motor LH Engine switch off Below 1 V
    Engine switch on (IG) 4 5 to 5 5 V
    A28-23 (SMR) - A28-18 (SMGR) G-B - W-R Headlight swivel motor RH Engine switch off Below 1 V
    Engine switch on (IG) 0 3 to 4 6 V
    A28-24 (SML) - A28-19 (SMGL) Y-B - P-G Headlight swivel motor LH Engine switch off Below 1 V
    Engine switch on (IG) 0 3 V to 4 6V
    A28-25 (BL1+) - A28-26 (BL1-) 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)
    A28-27 (BL2+) - A28-28 (BL2-) 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)
    A28-29 (LL1+) - A28-30 (LL1-) 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)
    A28-31 (LL2+) - A28-32 (LL2-) 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)
    A27-1 (E1) - Body ground W-B - Body ground Ground Always Below 1 V
    A27-2 (IG) - A27-1 (E1) B-O - W-B Power source circuit (To engine switch) Engine switch off Below 1 V
    Engine switch on (IG) 11 to 14 V
    A27-5 (MPX1) - A27-1 (E1) BR-R - W-B Multiplex communication signal Engine switch on (IG) Signal waveform
    A27-6 (MPX2) - A27-1 (E1) BR - W-B Multiplex communication signal Engine switch on (IG) Signal waveform
    A27-7 (SS+) - A27-8 (SS-) L - LG-B Steering sensor signal (To position sensor) Engine idling, slowly turn steering wheel Pulse generation
    A27-9 (SHRL) - A27-20 (SGR) 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
    A28-2 (SHFL) - A28-17 (SGF) 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
    A27-10 (SBR) - A27-20 (SGR) 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
    1. Waveform 1
      WAVEFORM REFERENCE 1

      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 6: Identifying Waveform 1
      G05756387Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Waveform 2
      WAVEFORM REFERENCE 2

      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 malfunction on the vehicle side Inspect the fuse, wire harness and connector
      Fig 7: Identifying Waveform 2
      G05320275Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Waveform 3
      WAVEFORM REFERENCE 3

      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, the vehicle is standing still or bouncing
      • If the value is not within the standard range, it is possible there is some malfunction on the vehicle side Inspect the fuse, wire harness and connector
      Fig 8: Identifying Waveform 3
      G05320276Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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