LIGHTING SYSTEM TERMINALS OF ECU


  1. CHECK FRONT CONTROLLER (MULTIPLEX NETWORK BODY ECU)

    A015ZOCE09
    Symbols (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

  2. CHECK MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH)

    A0161GCE27
    Symbols (Terminal No.) 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 HAED signal (to HAED relay) Light control switch OFF 11 to 14 V
    RD-1 (TRLY) - Body ground Y - Body ground HAED signal (to HAED 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)

    A0160R6E25
    Symbols (Terminal No.) 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 on (IG) and turn signal switch off 9 V to 14 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) on 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 off 9 V to 14 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) on 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
    LJ-25 (RFRL) - Body ground O - Body ground

    Rear fog light circuit

    (To rear fog lights)

    		 Rear fog lights ON 11 to 14 V
    LJ-25 (RFRL) - Body ground O - Body ground

    Rear fog light circuit

    (To rear fog lights)

    		 Rear fog lights OFF Below 1 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

    A015ZZYE20
    Symbols (Terminal No.) 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

    A015ZFWE09
    Symbols (Terminal No.) 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*1 - W-B

    P-B*2 - W-B

    Vehicle speed signal

    (To skid control ECU)

    		 Vehicle is driving at approx. 30 km/h (19 mph)

    Pulse generation

    (see waveform 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 waveform 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 waveform 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 waveform 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 waveform 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 waveform 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 waveform 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 waveform 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 waveform 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 waveform 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

    Tech Tips


    • *1: for LHD

    • *2: for RHD


    1. A01620QE01

      Waveform 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)
    2. A01615M

      Waveform 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 defect on the vehicle side. Inspect the fuse, wire harness and connector.
    3. A0163AP

      Waveform 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 defect on the vehicle side. Inspect the fuse, wire harness and connector.