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Terminals Of Ecu

  1. COMBINATION METER ASSEMBLY 
    Fig 1: Identifying Combination Meter Assembly Connector Terminals
    G05265992Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    ECU TERMINAL REFERENCE TABLE

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    C9-1 - Body ground Y-B - Body ground Auto height control signal Turn the ignition switch to the ON position, N indicator light OFF 10 to 14 V
    Turn the ignition switch to the ON position, N indicator light ON Below 2 V
    C9-2 - Body ground BR-B - Body ground Auto height control signal Turn the ignition switch to the ON position, LO indicator light OFF 10 to 14 V
    Turn the ignition switch to the ON position, LO indicator light ON Below 2 V
    C9-3 - Body ground Y-G - Body ground Auto height control signal Turn the ignition switch to the ON position, OFF indicator light OFF 10 to 14 V
    Turn the ignition switch to the ON position, OFF indicator light ON Below 2 V
    C9-4 - Body ground GR-R - Body ground 2nd START signal Turn the ignition switch to the ON position, 2nd START indicator light 10 to 14 V
    Turn the ignition switch to the ON position, 2nd START indicator light Below 2 V
    C9-5 ((1)) - Body ground L - Body ground Tire pressure signal Turn the ignition switch to the ON position, TIRE PRESSURE indicator light OFF 10 to 14 V
    Turn the ignition switch to the ON position, TIRE PRESSURE indicator light ON Below 2 V
    C9-6 - Body ground G - Body ground A/T shift condition signal Turn the ignition switch to the ON position, A/T P indicator light OFF 10 to 14 V
    Turn the ignition switch to the ON position, A/T P indicator light ON Below 2 V
    C9-7 - Body ground P - Body ground A/T OIL TEMP indicator light signal Turn the ignition switch to the ON position, A/T OIL TEMP indicator light OFF 10 to 14 V
    Turn the ignition switch to the ON position, A/T OIL TEMP indicator light ON Below 2 V
    C9-8 - Body ground Y-R - Body ground Washer level signal Turn the ignition switch to the ON position, washer level indicator light OFF 10 to 14 V
    Turn the ignition switch to the ON position, washer level indicator light ON Below 2 V
    C9-9 - Body ground BR - Body ground Ground (Engine ground) Always Below 1 Ω
    C9-10 - Body ground BR - Body ground Ground (Fuel ground) Always Below 1 Ω
    C9-11 - Body ground Y - Body ground Auto height control signal Turn the ignition switch to the ON position, HI indicator light OFF 10 to 14 V
    Turn the ignition switch to the ON position, HI indicator light ON Below 2 V
    C9-12 - Body ground G-O - Body ground Passenger seat belt warning light signal (Output) Turn the ignition switch to the ON position, passenger side seat belt warning light OFF 10 to 14 V
    Turn the ignition switch to the ON position, passenger side seat belt warning light blinks Below 2 V
    C9-13 - Body ground W-L - Body ground Passenger seat belt warning light signal (Input) Turn the ignition switch to the ON position, passenger side seat belt unfastened Below 2 V
    Turn the ignition switch to the ON position, passenger side seat belt fastened 10 to 14 V
    C9-14 - Body ground B - Body ground Accessory meter signal Communication circuit -
    C9-15- Body ground P - Body ground Accessory meter signal Communication circuit -
    C9-16 - Body ground GR - Body ground Rheostat signal Tail switch ON, rheostat switch MAX (TC) position Below 1 Ω
    C9-17 - Body ground W-G - Body ground Rheostat Signal Rheostat switch MIN (left side) position 10 to 14 V
    Rheostat switch MAX (right side) position Below 2 V
    C9-18 - Body ground G-R - Body ground A/T shift indicator light signal Turn the ignition switch to the ON position, A/T (L) indicator light ON Below 1 V
    Turn the ignition switch to the ON position, A/T (L) indicator light OFF 10 to 14 V
    C9-19 - Body ground R-L - Body ground IG signal Turn the ignition switch off Below 1 V
    Turn the ignition switch to the ON position 10 to 14 V
    C9-20 - Body ground R - Body ground Battery Always 10 to 14 V
    C10-2 - Body ground L-Y - Body ground Turn indicator light RH signal Turn the ignition switch to the ON position, turn signal RH indicator light OFF Below 2 V
    Turn the ignition switch to the ON, position, turn signal RH indicator light ON 10 to 14 V
    C10-4 - Body ground R-W - Body ground Hi-beam signal Turn the ignition switch to the ON position, BEAM indicator light ON 10 to 14 V
    Turn the ignition switch to the ON position, BEAM indicator light OFF Below 2 V
    C10-5 - Body ground R-G - Body ground Hi-beam signal Always Below 1 Ω
    C10-7 - Body ground L-B - Body ground Turn indicator light LH signal Turn the ignition switch to the ON position, turn signal LH indicator light OFF Below 2 V
    Turn the ignition switch to the ON position, turn signal LH indicator light ON 10 to 14 V
    C10-8 - Body ground B-L - Body ground BRAKE warning light signal Turn the ignition switch to the ON position, BRAKE warning light OFF 10 to 14 V
    Turn the ignition switch to the ON position, BRAKE warning light ON Below 2 V
    C10-9 - Body ground BR - Body ground Brake fluid level warning light signal Turn the ignition switch to the ON position, BRAKE warning light OFF 10 to 14 V
    Turn the ignition switch to the ON position, BRAKE warning light ON Below 2 V
    C10-10 - Body ground LG-R - Body ground ABS signal Turn the ignition switch to the ON position, ABS warning light OFF Below 2 V
    Turn the ignition switch to the ON position, ABS warning light ON 10 to 14 V
    C10-13 - Body ground L - Body ground A/T shift indicator light signal Turn the ignition switch to the ON position, A/T (2) indicator light OFF Below 2 V
    Turn the ignition switch to the ON position, A/T (2) indicator light ON 10 to 14 V
    C10-14 - Body ground G-0 - Body ground A/T shift indicator light signal Turn the ignition switch to the ON position, A/T (3) indicator light OFF Below 2 V
    Turn the ignition switch to the ON position, A/T (3) indicator light ON 10 to 14 V
    C10-15 - Body ground P-L - Body ground A/T shift indicator light signal Turn the ignition switch to the ON position, A/T (4) indicator light OFF Below 2 V
    Turn the ignition switch to the ON position, A/T (4) indicator light ON 10 to 14 V
    C10-16 - Body ground B-R - Body ground A/T shift indicator light signal Turn the ignition switch to the ON position, A/T (D) indicator light OFF Below 2 V
    Turn the ignition switch to the ON position, A/T (D) indicator light ON 10 to 14 V
    C10-17 - Body ground G-W - Body ground A/T shift indicator light signal Turn the ignition switch to the ON position, A/T (N) indicator light OFF Below 2 V
    Turn the ignition switch to the ON position, A/T (N) indicator light ON 10 to 14 V
    C10-18 - Body ground R-B - Body ground A/T shift indicator light signal Turn the ignition switch to the ON position, A/T (R) indicator light OFF Below 2 V
    Turn the ignition switch to the ON position, A/T (R) indicator light ON 10 to 14 V
    C10-19 - Body ground G-B - Body ground A/T shift indicator light signal Turn the ignition switch to the ON position, A/T (P) indicator light OFF Below 2V
    Turn the ignition switch to the ON position, A/T (P) indicator light ON 10 to 14 V
    C10-20 - Body ground V-W - Body ground IMMOBILIZER signal IMMOBILIZER indicator light OFF Below 2V
    IMMOBILIZER indicator light ON 10 to 14 V
    C11-2 - Body ground B-R - Body ground Fuel signal Engine idle speed Pulse generation (See  d waveform 4)
    C11-3 - Body ground R-L - Body ground Fuel signal Engine idle speed Pulse generation (See  b waveform 2)
    C11-4 - Body ground BR-R - Body ground Fuel signal Turn the ignition switch to the ON position, fuel level is FULL Below 2 V
    Turn the ignition switch to the ON position, fuel level is EMPTY 6V
    C11-5 - Body ground P-B - Body ground Water temperature communication signal Engine idle speed Pulse generation (See  c waveform 3)
    C11-8 - Body ground B-Y - Body ground Airbag indicator light signal Turn the ignition switch to the ON position, AIRBAG indicator light ON Below 2 V
    Turn the ignition switch to the ON position, AIRBAG indicator light OFF 10 to 14 V
    C11-9 - Body ground V-Y - Body ground All door condition signal (Except D door) Any door open Below 2 V
    Any of the doors except driver door closed 10 to 14 V
    C11-11 - Body ground LG-B - Body ground Ignition key signal Turn the ignition switch to the ON position, ignition key is inserted Below 2 V
    Turn the ignition switch to the ON position, ignition key is not inserted 10 to 14 V
    C11-12 - Body ground B-Y - Body ground Start signal Turn the ignition switch off Below 2V
    Turn the ignition switch to the ON position 10 to 14 V
    C11-13 - Body ground B-W - Body ground Tachometer signal Turn the ignition switch to the ON position, engine idle speed Pulse generation (See  b waveform 2)
    C11-14 - Body ground V-R - Body ground Speed signal (Output) Turn the ignition switch to the ON position, turn the wheel slowly Pulse generation (See  a waveform 1)
    C11-15 - Body ground P-L - Body ground Speed signal (Input) Turn the ignition switch to the ON position, turn the wheel slowly Pulse generation (See  a waveform 1)
    C11-17 - Body ground GR-B - Body ground Driver seat belt warning light signal Turn the ignition switch to the ON position, driver side seat belt warning light OFF 10 to 14 V
    Turn the ignition switch to the ON position, driver side seat belt warning light blinks Below 2 V
    C11-19 - Body ground L-B - Body ground Driver door condition signal Driver door OPEN Below 2 V
    Driver door CLOSE 10 to 14 V
    C12-1 ((1)) - Body ground Y-R - Body ground Roll sending of curtain shield airbag OFF signal Turn the ignition switch to the ON position, RSCA OFF indicator light OFF 10 to 14 V
    Turn the ignition switch to the ON position, RSCA OFF indicator light ON Below 2 V
    C12-3 - Body ground R-Y - Body ground HEAD/POSITION signal Turn the ignition switch to the ON position, HEAD ((1))/POSITION ((2)) indicator light OFF Below 2 V
    Turn the ignition switch to the ON position, HEAD ((1))/POSITION ((2)) indicator light ON 10 to 14 V
    C12-4 - Body ground LG - Body ground CRUISE indicator light signal Turn the ignition switch to the ON position, CRUISE indicator light OFF 10 to 14 V
    Turn the ignition switch to the ON position, CRUISE indicator light ON Below 2 V
    C12-8 - Body ground GR - Body ground CHARGE warning light signal Turn the ignition switch to the ON position, CHARGE warning light OFF 10 to 14 V
    Turn the ignition switch to the ON position, CHARGE warning light ON Below 2 V
    C12-9 - Body ground LG-B - Body ground Oil pressure signal Turn the ignition switch to the ON position, OIL PRESS indicator light OFF 10 to 14 V
    Turn the ignition switch to the ON position, OIL PRESS indicator light ON Below 2 V
    C12-10 - Body ground R-B - Body ground Check engine indicator light signal Turn the ignition switch to the ON position, CHECK E/G warning light ON Below 2 V
    Turn the ignition switch to the ON position, CHECK E/G warning light OFF 10 to 14 V
    C12-13 - Body ground G - Body ground Illumination signal Light control switch off Below 2 V
    Light control switch TAIL 10 to 14 V
    C12-14 - Body ground BR-Y - Body ground Downhill assist control signal Turn the ignition switch to the ON position, DAC indicator light OFF 10 to 14 V
    Turn the ignition switch to the ON position, DAC indicator light ON Below 2 V
    C12-15 - Body ground G-W - Body ground CTR DIFF LOCK signal Turn the ignition switch to the ON position, CTR DIFF LOCK or 4WD indicator light OFF 10 to 14 V
    Turn the ignition switch to the ON position, CTR DIFF LOCK or 4WD indicator light ON Below 2 V
    C12-16 - Body ground Y-R - Body ground VSC TRAC signal Turn the ignition switch to the ON position, VSC TRAC indicator light OFF 10 to 14 V
    Turn the ignition switch to the ON position, VSC TRAC indicator light ON Below 2 V
    C12-17 - Body ground L - Body ground KDSS signal Turn the ignition switch to the ON position, KDSS indicator light OFF 10 to 14 V
    Turn the ignition switch to the ON position, KDSS indicator light ON Below 2 V
    C12-18 - Body ground L-O - Body ground VSC OFF signal Turn the ignition switch to the ON position, VSC OFF indicator light OFF 10 to 14 V
    Turn the ignition switch to the ON position, VSC OFF indicator light ON Below 2 V
    C12-20 - Body ground R - Body ground SLIP signal Turn the ignition switch to the ON position, SLIP indicator light OFF 10 to 14 V
    Turn the ignition switch to the ON position, SLIP indicator light ON Below 2 V
    (1) for U.S.A.

    (2) for Canada
    1. Waveform 1 (Reference): Using an oscilloscope:

      OK 

      WAVEFORM REFERENCE TABLE

      Item Condition
      Tool setting 5 V/DIV, 200 ms/DIV.
      Vehicle condition Driving at approx. 20 km/h (12.4 mph)

      HINT:

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

      Fig 2: Identifying Waveform Reference Graph 1
      G04966493Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Waveform 2 (Reference): Using an oscilloscope:

      OK: 

      WAVEFORM REFERENCE TABLE

      Item Condition
      Tool setting 10 V/DIV., 20 ms/DIV.
      Vehicle condition Engine idle speed
      Fig 3: Identifying Waveform Reference Graph 2
      G04966494Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Waveform 3 (Reference): Using an oscilloscope:

      OK: 

      WAVEFORM REFERENCE TABLE

      Item Condition
      Tool setting 5V/DIV., 100 ms/DIV.
      Vehicle condition Engine idle speed

      HINT:

      As the engine coolant temperature rises, the period "A" becomes longer.

      Fig 4: Identifying Waveform Reference Graph 3
      G04966495Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Reference 

      WAVEFORM REFERENCE TABLE

      Engine Coolant Temperature A
      Less than 50°C (122.0°F) 96.304 to 100.304 ms
      83°C (181.4°F) 231.472 to 235.472 ms
      120°C (248.0°F) 383.024 to 387.024 ms
    4. Waveform 4 (Reference): Using an oscilloscope:
      5. Fig 5: Identifying Waveform Reference Graph 4
      G04966496Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK 

    WAVEFORM REFERENCE TABLE

    Item Condition
    Tool setting 10V/DIV., 20 ms/DIV.
    Vehicle condition Engine idle speed
  2. ACCESSORY METER 
    Fig 6: Identifying A22 Accessory Meter Connector Terminals
    G05265997Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    ECU TERMINAL REFERENCE TABLE

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    GND (A22-1) - Body ground W-B - Body ground Ground Always Below 1 Ω
    SG (A22-2) - Body ground Y-G - Body ground Outside temperature sensor signal Always Below 1 Ω
    TH+ (A22-3) - Body ground Y-R ((1))/GR ((2)) - Body ground Outside temperature sensor signal Ignition switch ON and outside temperature is -9°C (15.8°F) 3.24 V
    Ignition switch ON and outside temperature is 43°C (109.4°F) 0.73 V
    DMIN (A22-4) - Body ground B - Body ground Drive monitor signal Communication circuit -
    SWOT (A22-5) - Body ground P - Body ground Reset switch signal Communication circuit -
    TAIL (A22-6) - Body ground G ((1))/W ((2)) - Body ground Illumination signal Combination switch OFF → TAIL Below 1 V → 10 to 14 V
    TC (A22-8) - Body ground G-R - Body ground Tail cancel signal (Light control Rheostat) Tail cancel switch OFF → ON Below 1 V → 10 to 14 V
    DATA (A22-9) - Body ground G - O ((1))/GR ((2)) - Body ground Outside temperature data signal Ignition switch ON Pulse generation
    IG (A22-12) - Body ground B - R - Body ground Ignition switch signal Ignition switch OFF → ON Below 1 V → 10 to 14 V
    ACC (A22-13) - Body ground GR - Body ground ACC switch signal Ignition switch OFF → ON Below 1 V → 10 to 14 V
    +B (A22-14) - Body ground W - R((1))/R((2)) - Body ground Battery Always 10 to 14 V
    (1) with LEXUS Navigation System

    (2) without LEXUS Navigation System
  3. ECM 
    Fig 7: Identifying ECM Connector Terminals
    G05265998Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    ECM REFERENCE TABLE

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    TACH (E8-1) - Body ground B-W - Body ground Tachometer signal Ignition switch OFF → ON, engine idle speed Pulse generation (See  a waveform 1)
    THWO (E8-14) - Body ground P-B - Body ground Water temperature signal Ignition switch ON, engine coolant temp. 50°C (122.0°F) to 120°C (248°F) Pulse generation (See  b waveform 2)
    1. Waveform 1 (Reference): Using an oscilloscope:

      OK 

      WAVEFORM REFERENCE TABLE

      Item Condition
      Tool setting 10V/DIV., 20 ms/DIV.
      Vehicle condition Engine idle speed
      Fig 8: Identifying Waveform Reference Graph 1
      G05265999Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Waveform 2 (Reference): Using an oscilloscope:
      WAVEFORM REFERENCE TABLE

      Item Condition
      Tool setting 5V/DIV., 100 ms/DIV.
      Vehicle condition Engine idle speed

      HINT:

      As the engine coolant temperature rises, the period "A" becomes longer.

      Standard

      Fig 9: Identifying Waveform Reference Graph 2
      G05266000Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      WAVEFORM REFERENCE TABLE

      Engine Coolant Temperature A
      Less than 50°C (122.0°F) 96.304 to 100.304 ms
      83°C (181.4°F) 231.472 to 235.472 ms
      120°C (248.0°F) 383.024 to 387.024 ms
  4. COMBINATION METER INNER CIRCUIT 
    Fig 10: Identifying Combination Meter Inner Circuit Diagram (1 Of 3)
    G05266001Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 11: Identifying Combination Meter Inner Circuit Diagram (2 Of 3)
    G05266002Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 12: Identifying Combination Meter Inner Circuit Diagram (3 Of 3)
    G05266003Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    COMBINATION METER TERMINAL REFERENCE TABLE

    Connector No. Terminals No. Wire harness side
    C9 1 Air Suspension ECU
    2 Air Suspension ECU
    3 Air Suspension ECU
    4 ECM
    5 Tire Pressure Warning Switch
    6 Transfer Neutral Position Detection Switch
    7 ECM
    8 Washer Level Switch
    9 Ground (E/G)
    10 Ground (FUEL Ground)
    11 AIR Suspension ECU
    12 Passenger Seat Belt Warning Light
    13 Front Seat Inner Belt Assembly (Driver Side)
    14 Accessory Meter
    15 Accessory Meter
    16 Light Control Rheostat (TC)
    17 Light Control Rheostat (TR)
    18 Park/Neutral Position Switch (L)
    19 GAUGE Fuse
    20 DOME Fuse
    C10 1 -
    2 Turn Signal Flasher (R)
    3 Rear Fog Light Switch
    4 HEAD (HI RH) Fuse
    5 Combination Switch
    6 -
    7 Turn Signal Flasher (L)
    8 Skid Control ECU
    9 Oil Level Gauge
    10 Skid Control ECU
    11 -
    12 -
    13 A/T Shift Indicator (2)
    14 A/T Shift Indicator (3)
    15 A/T Shift Indicator (4)
    16 A/T Shift Indicator (D)
    17 A/T Shift Indicator (N)
    18 A/T Shift Indicator (R)
    19 A/T Shift Indicator (P)
    20 Theft Deterrent ECU
    C11 1 -
    2 AM2 Fuse
    3 ECM
    4 Fuel Sender Gauge Assembly
    5 ECM
    6 -
    7 -
    8 Airbag Sensor Assembly Center
    9 Body ECU
    10 -
    11 Body ECU
    12 Park/Neutral Position Switch
    13 ECM
    14 All parts that use speed signal (ECM, Navigation ECU, Multi-display, Body ECU, Stereo Component Amplifier, Moon Roof Control ECU & Motor, TPMS ECU, A/C ECU ((1)), A/C Control Assembly ((2)))
    15 Skid Control ECU
    16 -
    17 Front Seat Inner Belt Assembly (Passenger Side)
    18 -
    19 Body ECU
    20 -
    C12 1 Airbag Sensor Assembly Center
    2 Ground (Body Ground)
    3 HEAD (LO LH) Fuse ((3))
    4 ECM (CRUISE)
    5 -
    6 -
    7 -
    8 Alternator L Terminal
    9 Oil Pressure Switch
    10 ECM
    11 -
    12 -
    13 PANEL Fuse
    14 Skid Control ECU
    15 Center Differential Lock ECU
    16 Skid Control ECU
    17 Rear Diff Lock ECU
    18 Skid Control ECU
    19 -
    20 Skid Control ECU
    (1) with Lexus Navigation System

    (2) without Lexus Navigation System

    (3) for U. S. A. only
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