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Home >> Lexus >> 2019 >> GX 460 Base >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Meter / Gauge / Display System (Diagnostics - Introduction) (2 Of 2) >> Meter / Gauge System >> Terminals Of Ecu [08/2015 - 08/2017] >> Terminals Of Ecu [08/2015 - 08/2017]

Terminals Of Ecu [08/2015 - 08/2017]

  1. COMBINATION METER ASSEMBLY 
    Fig 1: G3 Combination Meter Assembly Connector Terminal Identification
    GTY648131Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage and resistance according to the value(s) in the table below.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      G3-1 (EP) - Body ground W-B - Body ground Ground Always Below 1 V
      G3-3 (ILL-) - Body ground GR - Body ground Illumination signal Engine switch on (IG), light control switch off 11 to 14 V
      Engine switch on (IG), light control switch in tail or head position Below 1 V
      G3-6 (RHUP) - Body ground B - Body ground Light control rheostat signal (Light control rheostat up switch) Engine switch on (IG), up switch pressed Below 1 V
      Engine switch on (IG), up switch not pressed 11 to 14 V
      G3-7 (RHDW) - Body ground P - Body ground Light control rheostat signal (Light control rheostat down switch) Engine switch on (IG), down switch pressed Below 1 V
      Engine switch on (IG), down switch not pressed 11 to 14 V
      G3-8 (TIRE) - Body ground Y - Body ground Tire pressure warning light signal Engine switch on (IG), tire pressure warning light off 3.2 V or higher
      Engine switch on (IG), tire pressure warning light blinks Below 3.2 V
      G3-9 (L) - Body ground B - Body ground Fuel sender gauge signal Fuel F (full tank) → E (empty) Below 1 V → 4.5 to 9 V
      G3-11 (RSET) - Body ground P - Body ground ODO/TRIP switch signal Engine switch on (IG), ODO/TRIP switch on (Pushed) Below 1 Ω
      Engine switch on (IG), ODO/TRIP switch off (Not pushed) 1 MΩ or higher
      G3-15 (OIL) - Body ground G - Body ground Engine oil level sensor signal Engine switch on (IG), engine oil level warning display off 11 to 14 V
      Engine switch on (IG), engine oil level warning display on Below 1 V
      G3-19 (B) - Body ground Y - Body ground Turn signal LH Engine switch on (IG), turn signal switch neutral position Below 1 V
      Engine switch on (IG), turn LH indicator light blinks Below 1 V ←→ 11 to 14 V
      G3-20 (B) - Body ground G - Body ground Turn signal RH Engine switch on (IG), turn signal switch neutral position Below 1 V
      Engine switch on (IG), turn RH indicator light blinks Below 1 V ←→ 11 to 14 V
      G3-21 (E2) - Body ground BR - Body ground Signal ground Always Below 1 V
      G3-23 (E) - Body ground W - Body ground Fuel sender gauge ground Always Below 1 Ω
      G3-25 (B) - Body ground L - Body ground Battery Always 11 to 14 V
      G3-27 (IG+) - Body ground R - Body ground Engine switch signal Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      G3-29 (S) - Body ground V - Body ground Oil pressure switch signal Engine switch on (IG), oil pressure warning light off 11 to 14 V
      Engine switch on (IG), oil pressure warning light on Below 1 V
      G3-30 (CHG-) - Body ground P - Body ground Charge warning light signal Engine switch on (IG), charge warning light off 11 to 14 V
      Engine switch on (IG), charge warning light on Below 1 V
      G3-31 (CHK) - Body ground V - Body ground MIL (Malfunction Indicator Lamp) signal Engine switch on (IG), MIL (Malfunction Indicator Lamp) off 11 to 14 V
      Engine switch on (IG), MIL (Malfunction Indicator Lamp) on Below 1 V
      G3-32 (+S) - Body ground R - Body ground Speed signal for other systems (Output) Engine switch on (IG), front wheel turned slowly Pulse generation
      (See waveform 1)
      G3-33 (SI) - Body ground V - Body ground Speed signal for other systems (Input) Engine switch on (IG), front wheel turned slowly Pulse generation
      (See waveform 1)
      G3-34 (WLVL) - Body ground W - Body ground Washer level warning switch signal Engine switch on (IG), washer level warning display off 11 to 14 V
      Engine switch on (IG), washer level warning display comes on Below 1 V
      G3-37 (LIN) - Body ground GR - Body ground LIN communication signal Engine switch on (IG) Pulse generation
      G3-39 (CANL) - Body ground W - Body ground CAN communication signal Engine switch off 200 Ω or higher
      G3-40 (CANH) - Body ground LG - Body ground CAN communication signal Engine switch off 200 Ω or higher
    2. Using an oscilloscope, check waveform 1.
      Fig 2: Waveform 1
      GTY627389Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      WAVEFORM 1 (REFERENCE)

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

      HINT: 

      When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by A in the illustration narrows.

  2. COMBINATION METER ASSEMBLY INNER CIRCUIT 
    Fig 3: Combination Meter Assembly Inner Circuit Diagram (1 Of 4)
    GTY469199Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 4: Combination Meter Assembly Inner Circuit Diagram (2 Of 4)
    GTY617494Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 5: Combination Meter Assembly Inner Circuit Diagram (3 Of 4)
    GTY635467Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 6: Combination Meter Assembly Inner Circuit Diagram (4 Of 4)
    GTY466096Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Terminal No. (Symbol) Wire Harness Side
    G3 1 (EP) Ground
    2 -
    3 (ILL-) Each part that uses illumination signal
    4 -
    5 -
    6 (RHUP) Light control rheostat
    7 (RHDW) Light control rheostat
    8 (TIRE) Tire pressure warning ECU and receiver
    9 (L) Fuel sender gauge assembly
    10 -
    11 (RSET) ODO/TRIP switch
    12 -
    13 -
    14 -
    15 (OIL) Oil level sensor
    16 -
    17 -
    18 -
    19 (B) Turn signal flasher assembly
    20 (B) Turn signal flasher assembly
    21 (E2) Ground
    22 -
    23 (E) Fuel sender gauge assembly
    24 -
    25 (B) Battery
    26 -
    27 (IG+) GAUGE fuse
    28 -
    29 (S) Oil pressure switch
    30 (CHG-) Generator
    31 (CHK) ECM
    32 (+S) Each part that uses vehicle speed signal
    33 (SI) Skid control ECU
    34 (WLVL) Washer level warning switch
    35 -
    36 -
    37 (LIN) Driving support switch control ECU
    38 -
    39 (CANL) CAN communication line
    40 (CANH) CAN communication line
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