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Terminals Of Ecu

WARNING: This page is about a different car, the 2006 Scion tC. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK COMBINATION METER ASSEMBLY 
    Fig 1: Identifying Combination Meter Assembly Connector Terminals
    G04224326Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TERMINAL NO. AND SPECIFIED CONDITION

    Terminal No. Wiring Color Terminal Description Condition Specified Condition
    C6-1 - Body ground BR - Body ground Ground Always Below 1 Ω
    C6-2 - Body ground SB - Body ground Ground Always Below 1 Ω
    C6-3 - Body ground V - Body ground Battery Always 10 to 14 V
    C6-4 - Body ground LG - Body ground Ignition switch signal Ignition switch ON 10 to 14 V
    Ignition switch OFF Below 1 V
    C6-5 - Body ground L - Body ground Seat belt condition signal Driver seat belt indicator light is OFF 10 to 14 V
    Driver seat belt indicator light blinks Below 1 V
    C6-6 - Body ground R - Body ground Taillight signal Light control switch ON 10 to 14 V
    Light control switch OFF Below 1 V
    C6-7 - Body ground Y - Body ground KEY switch signal No ignition key inserted 10 to 14 V
    Ignition key inserted Below 1 V
    C6-8 - Body ground BR - Body ground Driver door condition signal Driver door open 10 to 14 V
    Driver door closed Below 1 V
    C6-9 - Body ground W - Body ground Oil pressure signal OIL/P warning light OFF 10 to 14 V
    OIL/P warning light ON Below 1 V
    C6-10 - Body ground V - Body ground Brake fluid level signal Brake fluid level warning light ON 6.7 to 12 V
    Brake fluid level warning light OFF Below 1 V
    C6-11 - Body ground W - Body ground Illumination signal Ignition switch ON, rheostat is max 10 to 14 V
    Ignition switch OFF Below 1 V
    C6-12 - Body ground B - Body ground Brake fluid level signal Brake fluid level warning light OFF 10 to 14 V
    Brake fluid level warning light ON Below 1 V
    C6-13 - Body ground W - Body ground ABS signal Ignition switch ON, ABS warning light ON 6.7 to 12 V
    Ignition switch ON, ABS warning light OFF Below 1 V
    C6-14 - Body ground W - Body ground Door condition signal Door open 10 to 14 V
    Door closed Below 1 V
    C6-15 - Body ground Y - Body ground Charge signal Ignition switch ON 10 to 14 V
    Ignition switch OFF Below 1 V
    C6-16 - Body ground B - Body ground Transmission signal P or N indicator light (A/T shift indicator) is ON 7.5 to 11.5 V
    P or N indicator light (A/T shift indicator) is ON Below 1 V
    C6-17 - Body ground G - Body ground MIL signal MIL OFF 10 to 14 V
    MIL ON Below 1 V
    C6-18 - Body ground L - Body ground A/T shift condition signal (L) A/T L indicator light ON 10 to 14 V
    A/T L indicator light OFF Below 1 V
    C6-19 - Body ground GR - Body ground A/T shift condition signal (2) A/T 2 indicator light ON 10 to 14 V
    A/T 2 indicator light OFF Below 1 V
    C6-20 - Body ground GR - Body ground A/T shift condition signal (3) A/T 3 indicator light ON 10 to 14 V
    A/T 3 indicator light OFF Below 1 V
    C6-21 - Body ground R - Body ground Coolant temperature signal Ignition switch ON, coolant temperature is 90°C (194°F) Pulse generation (see waveform 1)
    C6-22 - Body ground LG - Body ground Seat belt condition signal (passenger side) Passenger seat belt indicator light blinks 10 to 14 V
    Passenger seat belt indicator light is OFF Below 1 V
    C6-23 - Body ground G - Body ground Fuel level signal Ignition switch ON, fuel level is EMPTY 4 to 7 V
    Ignition switch ON, fuel level is FULL Below 1 V
    C6-24 - Body ground P - Body ground Passenger seat belt warning signal Passenger seat belt indicator light blinks 10 to 14 V
    Passenger seat belt indicator light is OFF Below 1 V
    C6-25 - Body ground O - Body ground Speed signal (Input) Ignition switch ON and turn wheel slowly Pulse generation (see waveform 2)
    C6-26 - Body ground B - Body ground Tachometer signal Engine idle speed Pulse generation (see waveform 3)
    C6-27 - Body ground L - Body ground Speed signal (Output) Ignition switch ON and turn wheel slowly Pulse generation (see waveform 2)
    C6-29 - Body ground R - Body ground AIR BAG signal SRS warning light ON 8 to 14 V
    SRS warning light OFF Below 1 V
    C6-30 - Body ground GR - Body ground Hi-beam signal Hi-beam ON 10 to 14 V
    Hi-beam OFF Below 1 V
    C6-31 - Body ground R - Body ground Hi-beam signal Hi-beam ON 10 to 14 V
    Hi-beam OFF Below 1 V
    C6-32 - Body ground Y - Body ground Turn signal L Ignition switch ON, turn signal LH indicator light ON 10 to 14 V
    Ignition switch ON, turn signal LH indicator light OFF Below 1 V
    C6-33 - Body ground G - Body ground Turn signal R Ignition switch ON, turn signal RH indicator light ON 10 to 14 V
    Ignition switch ON, turn signal RH indicator light OFF Below 1 V
    C6-34 - Body ground B - Body ground CRUISE signal Ignition switch ON and cruise indicator light ON 10 to 14 V
    Ignition switch ON and cruise indicator light OFF Below 1 V
    C6-35 - Body ground GR - Body ground A/T shift condition signal (3) A/T 3 indicator light ON 10 to 14 V
    A/T 3 indicator light OFF Below 1 V
    C6-36 - Body ground LG - Body ground TPMS signal TPMS indicator light ON 10 to 14 V
    TPMS indicator light OFF Below 1 V
    C6-37 - Body ground B - Body ground A/T shift condition signal (P) A/T P indicator light ON 10 to 14 V
    A/T P indicator light OFF Below 1 V
    C6-38 - Body ground P - Body ground A/T shift condition signal (R) A/T R indicator light ON 10 to 14 V
    A/T R indicator light OFF Below 1 V
    C6-39 - Body ground R - Body ground A/T shift condition signal (N) A/T N indicator light ON 10 to 14 V
    A/T N indicator light OFF Below 1 V
    C6-40 - Body ground GR - Body ground A/T shift condition signal (D) A/T D indicator light ON 10 to 14 V
    A/T D indicator light OFF Below 1 V
    1. Using an oscilloscope, check the signal waveform of the meter.

    Waveform 1 (Reference) 

    ITEM AND CONDITION CHART

    Item Condition
    Tool setting 5 V/DIV., 10 msec./DIV.
    Vehicle condition Ignition switch ON

    Waveform 2 (Reference) 

    ITEM AND CONDITION

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

    Waveform 3 (Reference) 

    ITEM AND CONDITION

    Item Condition
    Tool setting 5 V/DIV., 10 msec./DIV.
    Vehicle condition Engine idle speed
    Fig 2: Identifying Signal Waveforms
    G04224327Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

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

    Fig 3: Meter/Gauge System Wiring Diagram (1 Of 3)
    G04224328Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 4: Meter/Gauge System Wiring Diagram (2 Of 3)
    G04224329Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 5: Meter/Gauge System Wiring Diagram (3 Of 3)
    G04224330Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Table of Terminal Connection 

    TABLE OF TERMINAL CONNECTION

    Terminal No. Wire harness side
    C6 1 Ground
    2 Fuel Sender Gauge Assembly
    3 ECU-B Fuse
    4 MET IG2 Fuse
    5 Front Seat Inner Belt Assembly (Driver Side)
    6 Light Control Switch, Tail Relay
    7 Unlock Warning Switch Assembly
    8 Door Courtesy Light Switch Assembly
    9 Engine Oil Pressure Switch Assembly
    10 Brake Actuator Assembly
    11 Light Control Rheostat
    12 Brake Fluid Level Warning Switch
    13 Brake Actuator Assembly
    14 Integration Relay
    15 Generator
    16 Brake Actuator Assembly
    17 ECM
    18 PNP Switch
    19 PNP Switch
    20 Shift Lock Control ECU
    21 ECM
    22 Front Seat Inner Belt Assembly (Passenger Side)
    23 Fuel Sender Gauge Assembly
    24 Front Passenger Seat Belt Warning Light
    25 Brake Actuator Assembly
    26 ECM
    27 ECM, Integration Relay
    28 -
    29 Airbag Sensor Assembly Center
    30 Headlight Dimmer Relay
    31 Headlight Dimmer Switch
    32 Turn Signal Flasher
    33 Turn Signal Flasher
    34 ECM
    35 -
    36 Brake Actuator Assembly
    37 PNP Switch
    38 PNP Switch
    39 PNP Switch
    40 Shift Lock Control ECU
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