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Terminals Of Ecu

  1. Combination Meter Assembly 
    Fig 1: Identifying Combination Meter ECU Terminals
    G04049999Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    SYMBOLS AND TERMINAL DESCRIPTION

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    E2 (J34-1) - Body Ground W-B - Body ground Ground Always Below 1 V
    FE (J34-2) - Body ground BR - Body ground Ground (Fuel ground) Always Below 1 V
    INT (J34-4) ((1)) - Body ground LG - Body ground Tire pressure select switch signal Engine switch on (IG), tire pressure select display ON 8 to 15 V
    Engine switch on (IG), tire pressure select display off Below 1.5 V
    +S (J34-5) - Body ground P - Body ground Speed signal (Output) Turn the wheel slowly Pulse generation (See waveform 1)
    MPX+ (J34-6) - Body ground BR - Body ground Multiplex communication signal - -
    TC (J34-8) - Body ground P - Body ground Light control rheostat signal Engine switch on (IG), the light control rheostat knob is at the MAX. position (turns fully clockwise) 4 to 6 V
    Engine switch on (IG), the light control rheostat knob is at the MIN. position (turns fully counterclockwise) Below 1 V
    ILL+ (J34-9) - Body ground V - Body ground Light control rheostat signal Engine switch on (IG), combination switch is except on OFF 4 to 6 V
    B (J34-11) - Body ground G - Body ground Turn indicator light signal Engine switch on (IG), turn signal LH indicator light OFF Below 1 V
    Engine switch on (IG), turn signal LH indicator light ON 10 to 14 V
    EFI (J34-12) - Body ground O - Body ground Ignition switch signal Engine switch off Below 1 V
    Engine switch on (IG) 10 to 14 V
    ES (J34-13) - Body ground W-B - Body ground Ground (Signal ground) Always Below 1 V
    ET (J34-14) - Body ground Y - Body ground Ground (Rheostat ground) Always Below 1 V
    INT (J34-15) (*) - Body ground P - Body ground Tire pressure initial switch signal Engine switch on (IG), tire pressure initial message ON 8 to 15 V
    Engine switch on (IG), tire pressure initial message off Below 1.5 V
    S (J34-16) - Body ground W - Body ground Tachometer signal Engine switch on (IG), engine idle speed Pulse generation (See waveform 2)
    SI (J34-17) - Body ground V - Body ground Speed signal (Input) Engine switch on (IG), turn the wheel slowly Pulse generation (See waveform 1)
    MPX- (J34-18) - Body ground BR - Body ground Multiplex communication signal - -
    FR (J34-19) - Body ground SB - Body ground Fuel signal Engine switch on (IG), fuel level is FULL Below 1 V
    Engine switch on (IG), fuel level is EMPTY 4 to 7 V
    MSSL (J34-20) - Body ground V - Body ground Steering pad switch signal Engine switch on (IG), DISP switch off 4 to 6 V
    Engine switch on (IG), DISP switch ON Below 1 V
    TR (J34-21) - Body ground B - Body ground Light control rheostat signal Engine switch on (IG), the light control rheostat knob is at the MIN. position (turns fully counterclockwise). Below 1 V
    Engine switch on (IG), the light control rheostat knob is at the MAX. position (turns fully clockwise). 4 to 6 V
    B (J34-23) - Body ground L - Body ground Battery Always 10 to 14 V
    B (J34-24) - Body ground LG - Body ground Battery Always 10 to 14 V
    PBLT (J35-3) - Body ground P - Body ground Passenger seat belt warning light signal Sit in the passenger seat, engine switch on (IG), passenger seat belt fastened 10 to 14 V
    Sit in the passenger seat, engine switch on (IG), pbelt warning light blinks Pulse generation (See waveform 3)
    P/SB (J35-4) - Body ground L - Body ground Passenger seat inner belt signal Engine switch on (IG), passenger seat belt unfastened 10 to 14 V
    Engine switch on (IG), passenger seat belt fastened Below 1 V
    RSEL (J35-5) - Body ground GR - Body ground Satellite switch RH signal Engine switch on (IG), satellite switch RH off 4 to 6 V
    Engine switch on (IG), satellite switch RH ON Below 1 V
    LSEL (J35-6) - Body ground O - Body ground Satellite switch LH signal Engine switch on (IG), satellite switch LH off 4 to 6 V
    Engine switch on (IG), satellite switch LH ON Below 1 V
    SET (J35-7) - Body ground V - Body ground Satellite switch ON/OFF signal Engine switch on (IG), satellite switch ON/OFF off 4 to 6 V
    Engine switch on (IG), satellite switch ON/OFF ON Below 1 V
    ILL- (J34-9) - Body ground W - Body ground Illumination signal Engine switch on (IG) 10 to 14 V
    B (J35-10) - Body ground R - Body ground Turn indicator light signal Engine switch on (IG), turn signal RH indicator light OFF Below 1 V
    Engine switch on (IG), turn signal RH indicator light ON 10 to 14 V
    EFI (J35-11) - Body ground LG - Body ground Check engine indicator light signal Engine switch on (IG), CHECK ENGINE warning light ON Below 1 V
    Engine switch on (IG), CHECK ENGINE warning light OFF 10 to 14 V
    SW (J35-15) - Body ground LG - Body ground Brake fluid level warning light signal Engine switch on (IG), BRAKE warning light OFF 10 to 14 V
    Engine switch on (IG), BRAKE warning light ON Below 1.5 V
    (1) with Tire Pressure Warning System
    1. Waveform 1 (Reference) : Using an oscilloscope:

      OK: 

      ITEM AND CONDITION REFERENCE

      Item Condition
      Tool setting 5 V/DIV., 20 ms./DIV.
      Vehicle condition Driving at approx. 20 km/h (12 mph)
      Fig 2: Signal Waveform Graph (Waveform 1)
      G04050000Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

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

    2. Waveform 2 (Reference) : Using an oscilloscope:

      OK: 

      ITEM AND CONDITION REFERENCE

      Item Condition
      Tool setting 5 V/DIV., 10 ms./DIV.
      Vehicle condition Engine idle speed
      Fig 3: Signal Waveform Graph (Waveform 2)
      G04050001Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Waveform 3 (Reference) : Using an oscilloscope:

    OK: 

    ITEM AND CONDITION REFERENCE

    Item Condition
    Tool setting 5 V/DIV., 200 ms./DIV.
    Vehicle condition Engine switch on (IG), p-belt warning light blinks
    Fig 4: Signal Waveform Graph (Waveform 3)
    G04050002Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. CLOCK ASSEMBLY (without NAVIGATION SYSTEM) 
    Fig 5: Identifying Clock ECU Terminals (Without Navigation System)
    G04050003Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    SYMBOLS AND TERMINAL DESCRIPTION

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    ILL+ (J54-3) - Body ground G - Body ground Illumination Signal Combination switch OFF Below 1 V
    Combination switch Head 10 to 14 V
    IG+ (J54-4) - Body ground B - Body ground Ignition Switch Signal Engine switch off Below 1 V
    Engine switch on (IG) 10 to 14 V
    ACC (J54-5) - Body ground O - Body ground Ignition Switch Signal Engine switch off Below 1 V
    Engine switch on (IG) 10 to 14 V
    E (J54-8) - Body ground W-B - Body ground Ground Always Below 1 V
    ILL-(J54-10) - Body ground LG - Body ground Illumination Signal Engine switch on (IG), combination switch Head, and light control rheostat position MAX. Pulse generation (See waveform)
    B (J54-14) - Body ground LG - Body ground Battery Always 10 to 14 V
    1. Waveform (Reference) : Using an oscilloscope:

    OK: 

    ITEM AND CONDITION REFERENCE

    Item Condition
    Tool setting 5 V/DIV., 200 ms./DIV.
    Vehicle condition Engine switch on (IG), light control rheostat is in the MID. position.
    Fig 6: Signal Waveform Graph
    G04050004Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. CLOCK ASSEMBLY (with NAVIGATION SYSTEM) 
    Fig 7: Identifying Clock ECU Terminals (With Navigation System)
    G04050005Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    SYMBOLS AND TERMINAL DESCRIPTION

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    E (J53-2) - Body ground W-B - Body ground Ground Always Below 1 V
    ILL+ (J53-4) - Body ground G - Body ground Illumination Signal Combination switch OFF Below 1 V
    Combination switch Head 10 to 14 V
    ACC (J53-5) - Body ground W-B - Body ground Ignition Switch Signal Engine switch off Below 1 V
    Engine switch on (IG) 10 to 14 V
    +B (J53-6) - Body ground BR - Body ground Battery Always 10 to 14 V
    ILL-(J53-10) - Body ground W - Body ground Illumination Signal Engine switch on (IG), combination switch Head, and light control rheostat position MAX. Pulse generation (See waveform)
    IG (J53-11) - Body ground B - Body ground Ignition Switch Signal Engine switch off Below 1 V
    Engine switch on (IG) 10 to 14 V
    1. Waveform (Reference) : Using an oscilloscope:

    OK: 

    ITEM AND CONDITION REFERENCE

    Item Condition
    Tool setting 5 V/DIV., 200 ms./DIV.
    Vehicle condition Engine switch on (IG), light control rheostat is in the MID. position.
    Fig 8: Signal Waveform Graph
    G04050006Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. COMBINATION METER INNER CIRCUIT 
    Fig 9: Combination Meter Inner Circuit Diagram (1 Of 2)
    G04050007Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 10: Combination Meter Inner Circuit Diagram (2 Of 2)
    G04050008Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TERMINAL AND WIRE HARNESS SIDE DESCRIPTION

    Terminals No. Wire harness side
    J34 1 Ground
    2 Ground (Fuel Ground)
    3 -
    4 Tire Pressure Warning ECU (INT) ((1))
    5 Each part that uses speed signal
    6 Multiplex Communication Line (MPX+)
    7 -
    8 Light Control Rheostat (TC)
    9 Light Control Rheostat (ILL+)
    10 -
    11 Turn Signal Flasher (B)
    12 MET Fuse
    13 Ground (Signal Ground)
    14 Light Control Rheostat (ET)
    15 Tire Pressure Warning ECU (INT) ((1))
    16 ECM (S)
    17 ABS & Traction Actuator Assembly ((2))/Skid Control ECU ((3)) (SI)
    18 Multiplex Communication Line (MPX-)
    19 Fuel Sender Gauge Assembly (FR)
    20 Steering Pad Switch (DISP)
    21 Light Control Rheostat (TR)
    22 -
    23 DOME Fuse
    24 MPX-B Fuse
    J35 1 -
    2 -
    3 Integration Control & Panel Assembly ( (4))/Multi-display ((5))
    4 Passenger Side Front Seat Inner Belt Assembly
    5 Satellite Switch (RSEL)
    6 Satellite Switch (LSEL)
    7 Satellite Switch (SET)
    8 -
    9 Illumination Parts
    10 Turn Signal Flasher (B)
    11 -
    12 ECM (EFI)
    13 -
    14 -
    15 Brake Fluid Level Warning Switch
    16 -
    (1) with Tire Pressure Warning System
    (2) without VDIM
    (3) with VDIM
    (4) without Navigation System
    (5) with Navigation System
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