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Terminals Of Ecu

WARNING: This page is about a different car, the 2006 Lexus RX 400h. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DISTANCE CONTROL ECU 
    Fig 1: Identifying Terminals Of ECU
    G04114824Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    ECU TERMINALS SPECIFIED CONDITION

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    +B - GND (D2-1 - D2-12) B - G Battery Always 10 to 14 V
    WIP2 - GND (D2-2 - D2-12) W - G Wiper switch signal Ignition switch: ON, Wiper switch: OFF --> HI Below 1 V --> 10 to 14 V
    WASH - GND (D2-3 - D2-12) B - G Washer switch signal Ignition switch: ON, Washer switch: OFF --> ON 10 to 14 V --> Below 1 V
    SGND - Body ground (D2-10 - Body ground) BR - Body ground Ground Always Below 1 Ω
    GND - Body ground (D2-12 - Body ground) G - Body ground Ground Always Below 1 Ω
    IGB - GND (D2-13 - D2-12) V - G Ignition switch on signal Ignition switch: ON 10 to 14 V
    MODE - GND (D2-16 - D2- 12) Y - G Distance control switch signal Ignition switch: ON, Distance control switch: OFF --> ON 10 to 14 V --> Below 1 V
    LRDD - GND (D2-22 - D2-12) B - G Laser radar sensor input signal Ignition switch: ON Pulse generation (see  a )
    LRRD - GND (D2-23 -D2-12) W - G Laser radar sensor input signal Ignition switch: ON Pulse generation (see  b )
    1. Reference: waveform 1
      Fig 2: Reference Waveform 1
      G04114825Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      • Terminal: LRDD - GND
      • Gauge set: 2 V/DIV, 10 msec./DIV
      • Condition: Ignition switch ON
    2. Reference: waveform 2
      Fig 3: Reference: Waveform 2
      G04114826Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      • Terminal: LRRD - GND
      • Gauge set: 2 V/DIV, 5 msec./DIV
      • Condition: Ignition switch ON
  2. CHECK HYBRID VEHICLE CONTROL ECU 
    Fig 4: Identifying Terminals Of Hybrid Vehicle Control ECU
    G04114827Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    HYBRID VEHICLE CONTROL ECU TERMINALS SPECIFIED CONDITION

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    E1 - Body ground (H31-5 - Body ground) BR - Body ground Ground Always Below 1 Ω
    LGND - Body ground (H31-5 - Body ground) Y - Body ground Ground Always Below 1 Ω
    CCHG - E1 (H29-18 - H31-5) GR - BR Distance control switch signal Ignition switch: ON, Cruise control main switch: ON, MODE switch: ON Below 1 V
    CCHG - E1 (H29-18 - H31-5) GR - BR Distance control switch signal Ignition switch: ON, Cruise control main switch: ON, MODE switch: OFF 10 to 14 V
    ST1- - E1 (H29-25 - H31- 5) LG - BR Stop light signal Brake pedal depressed (Stop light switch: ON) Below 1 V
    ST1- - E1 (H29-25 - H31-5) LG - BR Stop light signal Brake pedal depressed (Stop light switch: OFF) 10 to 14 V
    SPDI - E1 (H29-24 - H31-5) LG - BR Vehicle speed signal Engine start --> Car stoppage Below 1.5 V --> 4.7 to 16 V
    SPDI - E1 (H29-24 - H31-5) LG - BR Vehicle speed signal During pedal released (Pulse generated) 3 to 7 V
    STP - E1 (H29-31 - H31-5) O - BR Stop light signal Brake pedal released (Stop light switch: OFF) Below 1 V
    STP - E1 (H29-31 - H31-5) O - BR Stop light signal Brake pedal depressed (Stop light switch: ON) 10 to 14 V
    CCS - E1 (H29-26 - H31-5) P - BR Cruise control main switch signal Ignition switch: ON 10 to 16 V
    CCS - E1 (H29-26 - H31-5) P - BR Cruise control main switch signal CANCEL switch: ON 6.6 to 10.1 V
    CCS - E1 (H29-26 - H31-5) P - BR Cruise control main switch signal -/SET switch: ON 4.5 to 7.1 V
    CCS - E1 (H29-26 - H31-5) P - BR Cruise control main switch signal +/RES switch: ON 2.3 to 4.0 V
    CCS - E1 (H29-26 - H31-5) P - BR Cruise control main switch signal Main switch: ON Below 1 V

    If the value is not within the standard range, some defects on the vehicle is suspected.

  3. CHECK LASER SENSOR 
    Fig 5: Identifying Terminals Of Laser Sensor
    G04114828Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    LASER SENSOR TERMINALS SPECIFIED CONDITION

    Symbols (Terminals No.) Wiring Color Terminal Description Condition Specified Condition
    LGND - Body ground (L1-1 - Body ground) BR - Body ground Distance signal Always Below 1 Ω
    SGND - Body ground (L1-2 - Body ground) Y - Body ground Ground Always Below 1 Ω
    LRDD - SGND (L1-3 - L1-2) B - Y Laser radar sensor output signal Ignition switch: ON Pulse generation (see  a )
    LRRD - SGND (L1-4 - L1-2) W - Y Laser radar sensor input signal Ignition switch: ON Pulse generation (see  b )
    IGB - SGND (L1-5 - L1-2) V - Y Ignition switch signal Ignition switch: ON 10 to 14 V
    1. Reference: waveform 1
      Fig 6: Reference: Waveform 1
      G04114829Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      • Terminal: LRDD - SGND
      • Gauge set: 1 V/DIV, 2 msec./DIV
      • Condition: Ignition switch ON
    2. Reference: waveform 2
      Fig 7: Reference: Waveform 2
      G04114830Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      • Terminal: LRRD - SGND
      • Gauge set: 1 V/DIV, 2 msec./DIV
      • Condition: Ignition switch ON
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