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Terminals Of Ecu

  1. COMBINATION METER ASSEMBLY 
    Fig 1: Identifying Combination Meter ECU Terminals
    GTY150621Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
    J34-1 (E2) - Body Ground W-B - Body ground Ground Always Below 1 V
    J34-2 (FE) - Body ground BR - Body ground Ground (Fuel ground) Always Below 1 V
    J34-4 (INT) - 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
    J34-5 (+S) - Body ground P - Body ground Speed signal (Output) Turn the wheel slowly Pulse generation
    (See waveform 1)
    J34-6 (MPX+) - Body ground BR - Body ground Multiplex communication signal - -
    J34-8 (TC) - 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
    J34-9 (ILL+) - Body ground V - Body ground Light control rheostat signal Engine switch on (IG), combination switch is except on OFF 4 to 6 V
    J34-11 (B) - 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
    J34-12 (IG+) - Body ground BE - Body ground Engine switch signal Engine switch off Below 1 V
    Engine switch on (IG) 10 to 14 V
    J34-13 (ES) - Body ground W-B - Body ground Ground (Signal ground) Always Below 1 V
    J34-14 (ET) - Body ground Y - Body ground Ground (Rheostat ground) Always Below 1 V
    J34-15 (INT) - 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
    J34-16 (S) - Body ground W - Body ground Tachometer signal Engine switch on (IG), engine idle speed Pulse generation
    (See waveform 2)
    J34-17 (SI) - Body ground V - Body ground Speed signal (Input) Engine switch on (IG), turn the wheel slowly Pulse generation
    (See waveform 1)
    J34-18 (MPX-) - Body ground BR - Body ground Multiplex communication signal - -
    J34-19 (FR) - 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
    J34-20 (MSSL) - Body ground Y - 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
    J34-21 (TR) - 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
    J34-23 (B) - Body ground L - Body ground Battery Always 10 to 14 V
    J34-24 (B) - Body ground LG - Body ground Battery Always 10 to 14 V
    J35-3 (PBLT) - 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), passenger seat belt warning light blinks Pulse generation (See waveform 3)
    J35-4 (P/SB) - 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
    J35-5 (RSEL) - 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
    J35-6 (LSEL) - Body ground BE - 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
    J35-7 (SET) - 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
    J35-9 (ILL-) - Body ground W - Body ground Illumination signal Engine switch on (IG) 10 to 14 V
    J35-10 (B) - 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
    J35-12 (EFI) - Body ground SB - 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
    J35-15 (SW) - 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. Waveform 1 (Reference): Using an oscilloscope:
      Fig 2: Identifying Waveform 1
      GTY125421Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      OK:

      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.

    2. Waveform 2 (Reference): Using an oscilloscope:
      Fig 3: Identifying Waveform 2
      GTY141070Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      OK:

      Item Condition
      Tool setting 5 V/DIV., 10 ms./DIV.
      Vehicle condition Engine idle speed
    3. Waveform 3 (Reference): Using an oscilloscope:
      Fig 4: Identifying Waveform 2
      GTY141070Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      OK:

      Item Condition
      Tool setting 5 V/DIV., 200 ms./DIV.
      Vehicle condition Engine switch on (IG), passenger seat belt warning light blinks
  2. INTEGRATION CONTROL AND PANEL ASSEMBLY (w/o NAVIGATION SYSTEM) 
    Fig 5: Identifying Clock ECU Terminals (Without Navigation System)
    GTY150504Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
    J54-3 (ILL+) - Body ground G - Body ground Illumination Signal Combination switch OFF Below 1 V
    Combination switch Head 10 to 14 V
    J54-4 (IG+) - Body ground B - Body ground Engine Switch Signal Engine switch off Below 1 V
    Engine switch on (IG) 10 to 14 V
    J54-5 (ACC) - Body ground BE - Body ground Engine Switch Signal Engine switch off Below 1 V
    Engine switch on (IG) 10 to 14 V
    J54-8 (E) - Body ground W-B - Body ground Ground Always Below 1 V
    J54-10 (ILL-) - Body ground W - Body ground Illumination Signal Engine switch on (IG), combination switch Head, and light control rheostat position MAX. Pulse generation
    (See waveform)
    J54-14 (B) - Body ground LG - Body ground Battery Always 10 to 14 V
    1. Waveform (Reference): Using an oscilloscope:
      Fig 6: Identifying Waveform 2
      GTY141070Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      OK:

      Item Condition
      Tool setting 5 V/DIV., 200 ms./DIV.
      Vehicle condition Engine switch on (IG), light control rheostat is in the MID. position.
  3. CLOCK ASSEMBLY (w/ NAVIGATION SYSTEM) 
    Fig 7: Identifying Clock Assembly Connector Terminals (W/ Navigation System)
    GTY257571Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
    J92-3 (E) - Body ground W-B - Body ground Ground Always Below 1 V
    J92-5 (ILL+) - Body ground G - Body ground Illumination Signal Combination switch OFF Below 1 V
    Combination switch Head 10 to 14 V
    J92-6 (ACC) - Body ground BE - Body ground Engine Switch Signal Engine switch off Below 1 V
    Engine switch on (IG) 10 to 14 V
    J92-7 (B) - Body ground LG - Body ground Battery Always 10 to 14 V
    J92-14 (ILL-) - Body ground W - Body ground Illumination Signal Engine switch on (IG), combination switch Head, and light control rheostat position MAX. Pulse generation
    (See waveform)
    J92-15 (IG+) - Body ground B - Body ground Engine Switch Signal Engine switch off Below 1 V
    Engine switch on (IG) 10 to 14 V
    1. Waveform (Reference): Using an oscilloscope:
      Fig 8: Identifying Waveform 2
      GTY141070Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      OK:

      Item Condition
      Tool setting 5 V/DIV., 200 ms./DIV.
      Vehicle condition Engine switch on (IG), light control rheostat is in the MID. position.
  4. COMBINATION METER ASSEMBLY INNER CIRCUIT 
    Fig 9: Identifying Combination Meter Assembly Inner Circuit (1 Of 2)
    GTY139574Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 10: Identifying Combination Meter Assembly Inner Circuit (2 Of 2)
    GTY143863Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Terminal No. (Symbol) Wire harness side
    J34 1 (E2) Ground
    2 (FE) Fuel Sender Gauge Assembly
    3 -
    4 (INT) Tire Pressure Warning ECU
    5 (+S) Each part that uses speed signal
    6 (MPX+) Multiplex Communication Line
    7 -
    8 (TC) Light Control Rheostat
    9 (ILL+) Light Control Rheostat
    10 -
    11 (B) Turn Signal Flasher
    12 (IG+) GAUGE Fuse
    13 (ES) Ground
    14 (ET) Light Control Rheostat
    15 (INT) Tire Pressure Warning ECU
    16 (S) ECM
    17 (SI) Skid Control ECU
    18 (MPX-) Multiplex Communication Line
    19 (FR) Fuel Sender Gauge Assembly
    20 (MSSL) Steering Pad Switch
    21 (TR) Light Control Rheostat
    22 -
    23 (B) DOME Fuse
    24 (B) MPX-B Fuse
    J35 1 -
    2 -
    3 (PBLT) Integration Control And Panel Assembly (*1)/Clock Assembly (*2)
    4 (P/SB) Passenger Side Front Seat Inner Belt Assembly
    5 (RSEL) Satellite Switch
    6 (LSEL) Satellite Switch
    7 (SET) Satellite Switch
    8 -
    9 (ILL-) Illumination Parts
    10 (B) Turn Signal Flasher
    11 -
    12 (EFI) ECM
    13 -
    14 -
    15 (SW) Brake Fluid Level Warning Switch
    16 -

    *1: w/o Navigation System

    *2: w/ Navigation System

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