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Terminals Of Ecu [08/2020 - 10/2022]

  1. COMBINATION METER ASSEMBLY 
    Fig 1: G18 Combination Meter Assembly Connector Terminal Identification
    GTY915309Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the G18 combination meter assembly connector.
    2. Measure the voltage and resistance according to the value(s) in the table below.
      Terminal No. Wiring Color Terminal Description Condition Specified Condition
      G18-38 (IG+) - Body ground L - Body ground IG power supply Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V*1
      10.5 to 16 V*2
      G18-22 (B) - Body ground B - Body ground +B power supply Ignition switch off 11 to 14 V
      G18-1 (B) - Body ground B - Body ground +B power supply Ignition switch off 11 to 14 V
      G18-35 (ILL-) - Body ground L - Body ground Illumination signal Light control switch off Below 1 V
      Light control switch in tail or head position 11 to 14 V
      G18-19 (EP) - Body ground W-B - Body ground Ground Always Below 1 Ω
      G18-23 (ES) - Body ground W-B - Body ground Ground Always Below 1 Ω
      1. *1: w/o Stop and Start System
      2. *2: w/ Stop and Start System
    3. Reconnect the G18 combination meter assembly connector.
    4. Measure the voltage and resistance and check for pulses according to the value(s) in the table below.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      G19-24 (INT) - Body ground*1 L - Body ground Tire pressure warning light signal
      • Ignition switch ON
      • Steering pad switch assembly operated, "Set Pressure" selected on the multi-information display and "Enter" switch (steering pad switch assembly) pressed and held
      		 Below 1.5 V
      • Ignition switch ON
      • "Enter" switch (steering pad switch assembly) off
      		 8 to 15 V
      G18-20 (SI) - Body ground W - Body ground Speed signal for other system (Input) Ignition switch ON, wheel being rotated Pulse generation (See waveform 1)
      G18-36 (+S) - Body ground L - Body ground Speed signal for other system (Output) Ignition switch ON, wheel being rotated Pulse generation (See waveform 1)
      G18-14 (FV) - Body ground GR - Body ground Fuel sender gauge (Power source) Ignition switch ON Pulse generation (See waveform 3)
      G18-31 (FR) - G18-24 (FE&B) LG - BE Fuel level signal Ignition switch ON, fuel level full → low (fuel level warning light on) Pulse generation
      (See waveform 2)
      G18-13 (FR2) - G18-24 (FE&B)*2 L - BE Fuel level signal Ignition switch ON, fuel level full → low (fuel level warning light on) Pulse generation
      (See waveform 2)
      G18-24 (FE&B) - Body ground BE - Body ground Fuel sender gauge (Ground) Always Below 1 Ω
      G19-14 (WLVL) - Body ground LG - Body ground Washer fluid level signal Ignition switch ON, washer fluid level not low 11 to 14 V
      Ignition switch ON, washer fluid level low Below 1 V
      G19-36 (RLSB) - Body ground*5 SB - Body ground Rear LH seat belt warning light output signal Ignition switch ON, rear seat belt warning light (LH) off 11 to 14 V
      Ignition switch ON, rear seat belt warning light (LH) on Below 1 V
      G19-19 (RCSB) - Body ground*5 B - Body ground Rear center seat belt warning light output signal Ignition switch ON, rear seat belt warning light (center) off 11 to 14 V
      Ignition switch ON, rear seat belt warning light (center) on Below 1 V
      G19-35 (RRSB) - Body ground*5 LG - Body ground Rear RH seat belt warning light output signal Ignition switch ON, rear seat belt warning light (RH) off 11 to 14 V
      Ignition switch ON, rear seat belt warning light (RH) on Below 1 V
      G18-25 (CANL) W CAN communication line - -
      G18-9 (CANH) B CAN communication line - -
      G18-10 (MSCL)*4 W Local bus communication line - -
      G18-27 (MSCH)*4 G Local bus communication line - -
      G18-15 (MSTI) - Body ground R - Body ground Steering pad switch signal Ignition switch ON, up, down, right and left switches on steering pad switch assembly not pushed 4.3 to 5.2 V
      Ignition switch ON, left switch on steering pad switch pushed Below 0.6 V
      Ignition switch ON, up switch on steering pad switch pushed 1.0 to 2.2 V
      Ignition switch ON, down switch on steering pad switch pushed 2.3 to 3.4 V
      Ignition switch ON, right switch on steering pad switch pushed 3.4 to 4.5 V
      G18-32 (MSM+) - Body ground GR - Body ground Steering pad switch signal Ignition switch ON, enter and back switches on steering pad switch not pushed 4.3 to 5.2 V
      Ignition switch ON, enter switch on steering pad switch pushed Below 0.6 V
      Ignition switch ON, back switch on steering pad switch pushed 1.0 to 2.2 V
      G18-34 (SW1) - Body ground R - Body ground Power source for light control rheostat Ignition switch ON 4.6 to 5.4 V
      G18-16 (SW2) - Body ground G - Body ground Light control rheostat signal Light control rheostat fully turned left Below 1 Ω
      Light control rheostat fully turned right 8 to 12 kΩ
      G18-17 (TC) - Body ground B - Body ground TAIL cancel switch signal TAIL cancel switch on Below 1 Ω
      TAIL cancel switch off 1 MΩ or higher
      G18-11 (SW3) - Body ground B - Body ground Light control rheostat ground Always Below 1 Ω
      G19-31 (OILW) - Body ground W - Body ground Engine oil level signal Ignition switch ON, engine oil level not low Below 1 V
      Ignition switch ON, engine oil level low 11 to 14 V
      G19-7 (LP) - Body ground R - Body ground Security indicator signal Security indicator light off Below 2 V
      Security indicator light blinking Pulse generation
      G19-17 (HAZ) - Body ground L - Body ground Hazard warning signal switch signal (Output) Hazard warning signal switch off 11 to 14 V
      Hazard warning signal switch on Below 1 V
      G19-16 (SW) - Body ground*2 G - Body ground Brake fluid level signal Ignition switch ON, brake fluid level full Below 1 V
      Ignition switch ON, brake fluid level low (brake fluid level warning light on) 11 to 14 V
      G19-32 (VCM) - Body ground*2 BE - Body ground Vacuum warning switch signal Vacuum warning switch off 11 to 14 V
      Vacuum warning switch on Below 1 V
      G19-26 (SFT1) - Body ground*6 G - Body ground Drive mode switch signal (SPORT mode) Drive mode switch (SPORT mode) off 11 to 14 V
      Drive mode switch (SPORT mode) on Below 1 V
      G19-10 (SFT2) - Body ground*6 R - Body ground*2
      L - Body ground*3      		 Drive mode switch signal (NORMAL mode) Drive mode switch (NORMAL mode) off 11 to 14 V
      Drive mode switch (NORMAL mode) on Below 1 V
      G19-27 (SFT3) - Body ground*6 BE - Body ground*2
      V - Body ground*3      		 Drive mode switch signal (ECO mode) Drive mode switch (ECO mode) off 11 to 14 V
      Drive mode switch (ECO mode) on Below 1 V
      G19-6 (TRNR) - Body ground LA-B - Body ground Rear turn signal light RH signal Ignition switch ON, RH turn indicator light off Below 1 V
      Ignition switch ON, RH turn indicator light blinking 11 to 14 V ←→ Below 1 V
      G19-5 (TRNL) - Body ground LA-BE - Body ground Rear turn signal light LH signal Ignition switch ON, LH turn indicator light off Below 1 V
      Ignition switch ON, LH turn indicator light blinking 11 to 14 V ←→ Below 1 V
      G19-2 (LR) - Body ground G - Body ground Front/side turn signal light RH signal Ignition switch ON, RH turn indicator light off Below 1 V
      Ignition switch ON, RH turn indicator light blinking 11 to 14 V ←→ Below 1 V
      G19-1 (LL) - Body ground L - Body ground Front/side turn signal light LH signal Ignition switch ON, LH turn indicator light off Below 1 V
      Ignition switch ON, LH turn indicator light blinking 11 to 14 V ←→ Below 1 V
      1. *1: w/ Tire Pressure Warning System
      2. *2: for Gasoline Model
      3. *3: for HV Model
      4. *4: w/ Audio and Visual System
      5. *5: w/ Rear Seat Belt Warning Light
      6. *6: w/ Multi-information Display (for 7 Inch Display)
      1. Waveform 1 (Reference):
        Item Condition
        Tester connection
        • G18-20 (SI) - Body ground
        • G18-36 (+S) - Body ground
        Tool setting 5 V/DIV., 20 ms./DIV.
        Vehicle condition Ignition switch ON, wheel being rotated

        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.

        Fig 2: Waveform 1
        GTY436923Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 2:
        Fig 3: Waveform 2
        GTY776691Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        Item Condition
        Tester connection
        • G18-31 (FR) - G18-24 (FE&B)
        • G18-13 (FR2) - G18-24 (FE&B)*
        Tool setting 2.5 V/DIV., 20 ms./DIV.
        Vehicle condition Ignition switch ON, fuel level full → low (fuel level warning light on)

        *: for Gasoline Model

        HINT: 

        (A) will differ depending on the fuel level.

        • Fuel level full: 4.2 to 4.6 V
        • Fuel level low (fuel level warning light on): 0.3 to 0.7 V
      3. Waveform 3:
        Fig 4: Waveform 3
        GTY801514Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        Item Condition
        Tester connection G18-14 (FV) - Body ground
        Tool setting 2.5 V/DIV., 20 ms./DIV.
        Vehicle condition Ignition switch ON

        HINT: 

        Ignition switch ON (4.5 to 5.5 V)

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