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Terminals Of Ecu

  1. COMBINATION METER ASSEMBLY 
    Fig 1: Identifying Terminals Of ECU (Combination Meter Assembly)
    G04379935Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    ECU TERMINALS REFERENCE (COMBINATION METER ASSEMBLY)

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    AIRBAG (E3-1) - Body ground LG - Body ground Airbag signal Ignition switch on (IG), AIRBAG warning light ON --> OFF Below 1 V --> 7 to 12 V
    TURN R (E3-3) - Body ground P - Body ground Turn signal R Ignition switch on (IG), turn signal RH indicator light OFF --> ON Below 1 V --> 10 to 14 V
    TURN L (E3-4) - Body ground B - Body ground Turn signal L Ignition switch on (IG), turn signal LH indicator light OFF --> ON Below 1 V --> 10 to 14 V
    CHK E/G (E3-9) - Body ground R - Body ground Check engine signal Ignition switch on (IG), CHECK ENGINE warning light ON --> OFF Below 2.5 V --> 10 to 14 V
    H-LP LEVEL (E3-10) - Body ground G - Body ground Headlight auto level signal Ignition switch on (IG), headlight auto level indicator light ON --> OFF Below 1 V --> 10 to 14 V
    BRAKE LEVEL SW (E3-11) - Body ground V - Body ground Brake fluid level signal Ignition switch on (IG), brake warning light ON --> OFF Below 1 V --> 10 to 14 V
    PBKL (3-13) - Body ground G - Body ground Seat belt condition signal (Passenger side) Ignition switch on (IG), passenger seat belt indicator light OFF --> Blinks 10 to 14 V --> Below 1 V
    SI (E3-14) Body ground W - Body ground Speed signal (Input) Ignition switch on (IG), turn the wheel slowly Pulse generation (See WAVEFORM 1 )
    FUEL (E3-15) - Body ground GR - Body ground Fuel level signal Ignition switch on (IG), fuel level FULL --> EMPTY Below 1 V --> 4 to 7 V
    FE (E3-16) - E2-10 P - Body ground Ground (Fuel ground) Always Below 1 V
    DOME+B (E2-1) Body ground V - Body ground Battery Always 10 to 14 V
    ECU-B (E2-2) Body ground B - Body ground Battery Always 10 to 14 V
    MPX- (E2-4) - Body ground P - Body ground Communication circuit - -
    PANEL DIM (E2-8) ((1)) - Body ground Y - Body ground Panel dimmer signal Ignition switch on (IG), light control rheostat position MID Pulse generation (See WAVEFORM 2 )
    P BELT (E2-9) - Body ground B - Body ground Seat belt condition signal (Passenger side) Ignition switch on (IG), passenger seat belt indicator light OFF --> Blinks Pulse generation (See WAVEFORM 3 )
    S-GND (E2-10) - Body ground W-B - Body ground Ground (Signal ground) Always Below 1 V
    ILL - (E2-11) - Body ground R - Body ground Illumination signal Ignition switch on (IG), TAIL ON, and light control rheostat position MID Pulse generation (See WAVEFORM 4 )
    P-GND (E2-12) - Body ground W-B - Body ground Ground (Power ground) Always Below 1 V
    IG2 (E2-13) - Body ground R - Body ground Battery Ignition switch OFF --> ON (IG) Below 1 V --> 10 to 14 V
    TACHO (E2-14) - Body ground O- Body ground Tachometer signal Engine running Pulse generation (See WAVEFORM 5 )
    4P (E2-15) - Body ground SB - Body ground Speed signal (Output) Ignition switch on (IG), turn the wheel slowly Pulse generation (See WAVEFORM 1 )
    MPX+ (E2-16) - Body ground LG - Body ground Communication circuit - -
    SECURITY (E2-18) ((2)) - Body ground Y - Body ground Security signal Ignition switch off, SECURITY warning light ON --> OFF 10 to 14 V --> Below 1 V
    TC SW (E2-19) - Body ground V - Body ground Tail cancel switch signal Tail cancel switch OFF --> ON 4 to 6 V --> Below 1 V
    RL (E2-20) - Body ground B - Body ground Light control rheostat signal Ignition switch on (IG) 4 to 6 V
    RV (E2-21) - Body ground R - Body ground Light control rheostat signal Ignition switch on (IG), light control rheostat position MIN --> MAX Below 1 V --> 4 4 to 6 V
    RE (E2-22) - Body ground W - Body ground Ground (Rheostat ground) Always Below 1 V
    (1) w/o Navigation System
    (2) w/ Theft Deterrent System
    1. Waveform 1 (Reference): Using an oscilloscope:
      Fig 2: Waveform 1 Graph
      G04379936Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
      WAVEFORM 1 (REFERENCE)

      Item Condition
      Tool setting 5 V/DIV., 20 ms/DIV.
      Vehicle condition Driving at approx. 20 km/h (12 mph)

      HINT:

      As vehicle speed increases, the cycle of the signal waveform narrows.

      Fig 3: Waveform 2 Graph
      G04379937Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    2. Waveform 2 (Reference): Using an oscilloscope:
      WAVEFORM 2 (REFERENCE)

      Item Condition
      Tool setting 2 V/DIV., 2 ms/DIV.
      Vehicle condition Ignition switch ON (IG), light control rheostat position MID
    3. Waveform 3 (Reference): Using an oscilloscope:
      Fig 4: Waveform 3 Graph
      G04379938Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
      WAVEFORM 3 (REFERENCE)

      Item Condition
      Tool setting 5 V/DIV., 200 ms/DIV.
      Vehicle condition Ignition switch ON (IG), passenger seat belt indicator light blinks
    4. Waveform 4 (Reference): Using an oscilloscope:
      Fig 5: Waveform 4 Graph
      G04379939Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
      WAVEFORM 4 (REFERENCE)

      Item Condition
      Tool setting 5 V/DIV., 2 ms/DIV.
      Vehicle condition Ignition switch ON (IG), light control rheostat position MID
    5. Waveform 5 (Reference): Using an oscilloscope:
      Fig 6: Waveform 5 Graph
      G04379940Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
      WAVEFORM 5 (REFERENCE)

      Item Condition
      Tool setting 5 V/DIV., 10 ms/DIV.
      Vehicle condition Engine idle speed
  2. ACCESSORY METER ASSEMBLY 
    Fig 7: Identifying Terminals Of ECU (Accessory Meter Assembly)
    G04379941Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    ECU TERMINALS REFERENCE (ACCESSORY METER ASSEMBLY)

    Symbols Wiring Terminal Description Condition Specified Condition
    ACC (E7-1) - Body ground GR - Body ground Battery Ignition switch OFF --> ON (ACC) Below 1 V --> 10 to 14 V
    IG2 (E7-2) - Body ground G - Body ground Battery Ignition switch OFF --> ON (IG) Below 1 V --> 10 to 14 V
    TAIL (TR) (E7-5) - Body ground Y - Body ground Illumination signal Ignition switch on (IG), light control rheostat position MID Pulse generation (See WAVEFORM 1 )
    RE1 (SW) (E7-7) - Body ground G - Body ground Display switch signal Ignition switch on (IG), display switch is pushed in 4 to 6 V --> Below 1 V
    GND1 (E7-8) - Body ground W-B - Body ground Ground (Power ground) Always Below 1 V
    GND1 (E7-9) - Body ground R - Body ground Battery Always 10 to 14 V
    TX1+ (E7-11) ((1)) - Body ground Y - Body ground Communication line - -
    TX+ (E7-12) ((1)) - Body ground BR - Body ground Communication line - -
    TX1- (E7-13) ((1)) - Body ground B - Body ground Communication line - Below 1 V
    TX1- (E7-14) ((1)) - Body ground R - Body ground Communication line - -
    SG1 (E7-15) - Body ground W - Body ground Display switch signal Always Below 1 V
    SG (E7-16) - Body ground W-B - Body ground Ground (Signal ground) Ground (Signal ground) Below 1 V
    IG2 (E11-1) - Body ground W - Body ground Battery Ignition switch OFF --> ON (IG) Below 1 V --> 10 to 14 V
    MSW (E11-3) ((1)) - Body ground G - Body ground Display switch signal Ignition switch on (IG), display switch is pushed in 4 to 6 V --> Below 1 V
    SG1 (E11-4) ((1)) - Body ground W - Body ground Display switch signal Always Below 1 V
    SGND (E11-6) - Body ground W-B - Body ground Ground (Signal ground) Always Below 1 V
    ACAN (E11-7) - Body ground V - Body ground Illumination signal Ignition switch on (IG), TAIL OFF --> ON Below 1 V --> 10 to 14 V
    P-BELT (E11-9) - Body ground B - Body ground Seat belt condition signal (Passenger side) Ignition switch on (IG), sit on the passenger seat and passenger seat belt warning light OFF --> blinks Pulse generation (See WAVEFORM 2 )
    P-AIRBAG-OFF (E11-10) - Body ground L - Body ground P-AIRBAG-OFF signal Ignition switch on (IG), P-AIRBAG-OFF indicator light OFF --> ON 10 to 14 V --> Below 1 V
    P-AIRBAG-ON (E11-11) - Body ground BR - Body ground P-AIRBAG-ON signal Ignition switch on (IG), P-AIRBAG-ON indicator light OFF --> ON 10 to 14 V --> Below 1 V
    B (+) (E4-1) ((1)) - Body ground W - Body ground Battery Always 10 to 14 V
    EARTH (E4-2) ((1)) - Body ground W-B - Body ground Ground Always Below 1 V
    ILL (+) (E4-3) ((1)) - Body ground G - Body ground Illumination signal Ignition switch on (IG), light control switch OFF --> ON Below 1 V --> 10 to 14 V
    ACC (+) (E4-4) ((1)) - Body ground B - Body ground Battery Ignition switch OFF --> ON (IG) Below 1 V --> 10 to 14 V
    ACC (+) (E5-4) ((2)) - Body ground) B - Body ground Battery Ignition switch OFF --> ON (IG) Below 1 V --> 10 to 14 V
    TX- (E5-5) ((2)) - Body ground LG - Body ground Communication line - -
    TX+ (E5-6) ((2)) - Body ground V - Body ground Communication line - -
    EARTH (E5-7) ((2)) - Body ground W-B - Body ground Ground Always Below 1 V
    B (+) (E5-8) ((2)) - Body ground W - Body ground Battery Always 10 to 14 V
    (1) w/o Navigation System
    (2) w/ Navigation System
    1. Waveform 1 (Reference): Using an oscilloscope:
      Fig 8: Waveform 1 Graph
      G04379942Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
      WAVEFORM 1 (REFERENCE)

      Item Condition
      Tool setting 2 V/DIV., 2 ms/DIV.
      Vehicle condition Ignition switch ON (IG), light control rheostat position MID
    2. Waveform 2 (Reference): Using an oscilloscope:
      WAVEFORM 2 (REFERENCE)

      Item Condition
      Tool setting 5 V/DIV., 200 ms/DIV.
      Vehicle condition Ignition switch ON (IG), passenger seat belt indicator light blinks
  3. ECM 
    Fig 9: Waveform 2 Graph
    G04379943Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    Fig 10: Identifying Terminals Of ECU (ECM)
    G04379944Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    ECU TERMINALS REFERENCE (ECM)

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    TACH (D41-1) - Body ground W - Body ground Tachometer signal Ignition switch OFF --> ON (IG), Engine idle speed Pulse generation (See WAVEFORM 1 )
    1. Waveform 1 (Reference): Using an oscilloscope:
      Fig 11: Waveform 1 Graph
      G04379945Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
      WAVEFORM 1 (REFERENCE)

      Item Condition
      Tool setting 10 V/DIV., 20 V/DIV.
      Vehicle condition Engine idle speed
  4. COMBINATION METER INNER CIRCUIT 
    Fig 12: Combination Meter Inner Circuit Diagram (1 Of 2)
    G04379946Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    Fig 13: Combination Meter Inner Circuit Diagram (2 Of 2)
    G04379947Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

    Connectors: 

    CONNECTORS REFERENCE

    Terminal No. Wire harness side
    E3 1 Airbag Sensor Assembly Center
    2 -
    3 Turn Signal Flasher (R)
    4 Turn Signal Flasher (L)
    5 -
    6 -
    7 -
    8 -
    9 ECM (Check E/G)
    10 Headlight Beam Level Control ECU
    11 Brake Fluid Level Warning Switch
    12 -
    13 Airbag Sensor Assembly Center
    14 ABS and Traction Actuator Assembly (VSC) ((1)), Brake Actuator Assembly (ABS) ((2))
    15 Fuel Sender Gauge Assembly (Fuel)
    16 Fuel Sender Gauge Assembly (Fuel Ground)
    E2 1 DOME Fuse
    2 ECU-B Fuse
    3 -
    4 Multiplex Communication Line
    5 -
    6 -
    7 -
    8 Multi-Display ((3))
    9 Multi-Display
    10 Ground (Signal Ground)
    11 Illumination Parts
    12 Ground (Power Ground)
    13 IG2 Fuse
    14 ECM
    15 Each Parts That Use Speed Signal (ECM, Power Source ECU, Body ECU, Navigation ECU)
    16 Multiplex Communication Line
    17 -
    18 ID Code Box ((4)), Transponder Key ECU ((4)) / Certification ECU ((5))
    19 Light Control Rheostat (TC)
    20 Light Control Rheostat (T)
    21 Light Control Rheostat (RV)
    22 Ground (Light Control Rheostat Ground)
    23 -
    24 -
    (1) w/ VSC
    (2) w/o VSC
    (3) w/o Navigation System
    (4) w/o Smart key System
    (5) w/ Smart key System
  5. ACCESSORY METER INNER CIRCUIT 
    Fig 14: Accessory Meter Inner Circuit Diagram (w/o Navigation System)
    G04379948Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    Fig 15: Accessory Meter Inner Circuit Diagram (w/ Navigation System)
    G04379949Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    ACCESSORY METER INNER CIRCUIT DIAGRAM REFERENCE

    Terminal No. Wire harness side
    E7 1 ECU-ACC Fuse
    2 IG2 Fuse
    3 -
    4 -
    5 Combination Meter Assembly
    6 -
    7 Display Switch ((1))
    8 Ground (Power Ground)
    9 ECU-B Fuse
    10 -
    11 Audio Controller
    12 Gateway ECU
    13 Audio Controller
    14 Gateway ECU
    15 Display Switch ((1))
    16 Ground (Signal Ground)
    E11 1 DOME Fuse
    2 -
    3 Display Switch ((1))
    4 Display Switch ((1))
    5 -
    6 Ground (Signal Ground)
    7 Body ECU
    8 -
    9 Combination Meter Assembly
    10 Airbag Sensor Assembly Center
    11 Airbag Sensor Assembly Center
    12 -
    E4 ((1)) 1 DOME Fuse
    2 Ground (Power Ground)
    3 Body ECU
    4 ECU-ACC Fuse
    E5 ((2)) 1 -
    2 -
    3 -
    4 ECU-ACC Fuse
    5 Multi-Display
    6 Multi-Display
    7 Ground (Power Ground)
    8 IG2 Fuse
    (1) w/o Navigation System
    (2) w/ Navigation System
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