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Terminals Of Ecu

WARNING: This page is about a different car, the 2009 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DRIVER SIDE JUNCTION BLOCK (MAIN BODY ECU) 
    Fig 1: Identifying Driver Side Junction Block (Main Body ECU) Connector Terminals (Front Side)
    G04475772Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    ECU TERMINALS DESCRIPTION AND SPECIFIED CONDITIONS

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    Tail (1A-15) - GND (1E-17) BR - W-B Taillight signal
    (To front side marker)    		 Front RH side marker light turns on 10 to 14 V
    Front RH side marker light turns off Below 1 V
    ECUB (1A-30) - GND (1E-17) R - W-B Power source
    (From battery)    		 Always 10 to 14 V
    Tail (1A-33) - GND (1E-17) BR - W-B Taillight signal
    (To front side marker)    		 Front LH side marker light turns on 10 to 14 V
    Front LH side marker light turns off Below 1 V
    RCTY (1D-5) - GND (1E-17) R - W-B Rear LH door courtesy switch signal Rear LH door is opened Below 1 V
    Rear LH door is closed 10 to 14 V
    BCTY (1D-7) - GND (1E-17) Luggage room courtesy switch signal Luggage room door is opened Below 1 V
    Luggage room door is closed 10 to 14 V
    Tail (1D-10) - GND (1E-17) BR - W-B Taillight signal
    (To license plate light and rear combination light)    		 License plate light and rear RH combination light come on 10 to 14 V
    License plate light and rear RH combination light go off Below 1 V
    RCTY(1D-20) - GND (1E-17) R - W-B Rear RH door courtesy switch signal Rear LH door is opened Below 1 V
    Rear LH door is closed 10 to 14 V
    DCTY (1D-21) - GND (1E-17) V - W-B Front LH door courtesy switch signal Front LH door is opened Below 1 V
    Front LH door is closed 10 to 14 V
    PCTY (1D-24) - GND (1E-17) BR - W-B Front RH door courtesy switch signal Front RH door is opened Below 1 V
    Front RH door is closed 10 to 14 V
    Tail (1D-29) - GND (1E-17) BR - W-B Taillight signal
    (To rear combination light)    		 Rear LH combination light turns on Below 1 V
    Rear LH combination light turns off 10 to 14 V
    Tail (1E-10) - GND (1E-17) BR - W-B Taillight signal
    (To each illumination)    		 Light control switch is in TAIL or HEAD Below 1 V
    Light control switch is OFF 10 to 14 V
    GND (1E-17) - Body ground W-B - Body ground Ground Always Below 1 V
    ILL (1E-27) - GND (1E-17) B - W-B Illumination signal circuit Key slot light turns on Below 1 V
    Key slot light turns off 10 to 14 V
    MPX1 (1G-9) - GND (1E-17) GR - W-B Multiplex communication signal circuit Power switch ON (IG) Signal waveform
    HU (1I-4) - GND (1E-17) P - W-B Headlight dimmer switch signal Headlight dimmer switch in HIGH Below 1 V
    Headlight dimmer switch not in HIGH 10 to 14 V
    Tail (1N-7) - GND (1E-17) GR - W-B Taillight signal
    (To each illumination)    		 Light control switch is in TAIL or HEAD Below 1 V
    Light control switch is OFF 10 to 14 V
    Tail (1N-9) - GND (1E-17) G - W-B Light control switch is in TAIL or HEAD Below 1 V
    Light control switch is OFF 10 to 14 V
    Tail (1M-6) - GND (1E-17) L - W-B Light control switch is in TAIL or HEAD Below 1 V
    Light control switch is OFF 10 to 14 V
    Tail (1M-8) - GND (1E-17) G - W-B Light control switch is in TAIL or HEAD Below 1 V
    Light control switch is OFF 10 to 14 V
    ILL (1O-2) - GND (1E-17) L - W-B Illumination signal circuit Room light turns on Below 1 V
    Room light turns off (When switch is in DOOR position) 10 to 14 V
    CYLB (B5-7) - GND (1E-17) W - W-B Luggage room light signal circuit Luggage room light turns on Below 1 V
    Luggage room light turns off (When switch is in DOOR position) 10 to 14 V
    LSWR (B5-10) - GND (1E-7) O - W-B Door lock position switch circuit Rear door is in lock position 10 to 14 V
    Rear door is in unlock position Below 1 V
    LIB1 (B5-13) - GND (1E-17) SB - W-B Front fog light switch signal circuit Front fog light switch ON Below 1 V
    Front fog light switch OFF 10 to 14 V
    CYPL (B5-14) - GND (1E-17) L - W-B Door courtesy light circuit Door courtesy light RH turns on Below 1 V
    Door courtesy light RH turns off 10 to 14 V
    MPX2 (B5-15) - GND (1E-17) B - W-B Multiplex communication signal circuit Power switch ON (IG) Signal waveform
    FFOG (B5-17) - GND (1E-17) Y - W-B Front fog light operation signal circuit Front fog light turns on Below 1 V
    Front fog light turns off 10 to 14 V
    AUTO (B5-18) - GND (1E-17) W - W-B Headlight dimmer switch signal circuit Light control switch is in AUTO Below 1 V
    Light control switch is not in AUTO 10 to 14 V
    CYLD (B5-19) - GND (1E-17) Y - W-B Door courtesy light circuit Door courtesy light LH turns on Below 1 V
    Door courtesy light LH turns off 10 to 14 V
    PWM1 (B6-3) - GND (1E-7)* SB - W-B Daytime running light operation signal Daytime running light does not operate 10 to 14 V
    Daytime running light operates Below 1 V
    HON (B6-12) - GND (1E-7) W - W-B Daytime running light operation signal Daytime running light does not operate Below 1 V
    Daytime running light operates 10 to 14 V
    CLTE (B6-14) - GND (1E-7) B - W-B Light control sensor circuit (Ground circuit) Always Below 1 V
    CLTS (B6-15) - GND (1E-7) W - W-B Light control sensor circuit
    (Signal circuit)    		 Power switch ON (IG) Signal waveform
    CLTB (B6-16) - GND (1E-7) R - W-B Light control sensor circuit
    (Power source circuit)    		 Power switch ON (IG) 10 to 14 V
    DRL/DIM (B7-2) - GND (1E-17) Y - W-B DIM relay operation signal Headlight (High beam) turns on Below 1 V
    Headlight (High beam) turns off 10 to 14 V
    HEAD (B7-3) - GND (1E-17) B - W-B Headlight dimmer switch signal circuit Light control switch is in HEAD Below 1 V
    Light control switch is not in HEAD 10 to 14 V
    LSWP (B7-10) - GND (1E-7) Y - W-B Door lock position switch circuit Front RH door is in lock position Below 1 V
    Front RH door is in unlock position 10 to 14 V
    HRLY (B7-20) - GND (1E-7) G - W-B HEAD relay operation signal Headlight turns on Below 1 V
    Headlight turns off 10 to 14 V
    TAIL (B7-21) - GND (1E-7) R - W-B Headlight dimmer switch signal circuit Light control switch is in TAIL Below 1 V
    Light control switch is not in TAIL 10 to 14 V
    HF (B7-22) - GND (1E-7) G - W-B Headlight dimmer switch is in FLASH Below 1 V
    Headlight dimmer switch is not in FLASH 10 to 14 V
    LSWD (B7-25) - GND (1E-7) LG - W-B Door lock position switch circuit Front LH door is in lock position 10 to 14 V
    Front LH door is in unlock position Below 1 V

    HINT:

    *: w/ Daytime running light

  2. CHECK HEADLIGHT BEAM LEVEL CONTROL ECU 
    Fig 2: Identifying Headlight Beam Level Control ECU Connector Terminals
    G04475773Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TERMINALS DESCRIPTION AND SPECIFIED CONDITIONS

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    IG (H12-1) - E1 (H12-24) V - W-B Power source
    (From battery)    		 Power switch ON (IG) 10 to 14 V
    SBR (H12-2) - E1 (H12-24) P - W-B Height control sensor
    (Power source)    		 Power switch ON (IG) 4.5 to 5.5 V
    RH2 (H12-3) - E1 (H12-24) W - W-B Headlight beam level control actuator RH
    (Signal circuit)    		 With power switch ON (IG) and headlight ON, change the vehicle height and maintain height for more than 2 seconds 1.0 to 12.6 V
    (approx. 10 seconds)
    LH2 (H12-4) - E1 (H12-24) R - W-B Headlight beam level control actuator LH (Signal circuit)
    SHR (H12-5) - E1 (H12-24) L - W-B Height control sensor
    (Power source)    		 Power switch ON (IG) Above 2.5 V
    PRST (H12-9) - E1 (H12-24) B - W-B Initialize signal input terminal Above 5.0 V
    HDLP (H12-10) - E1 (H12-24) G - W-B HEAD relay operate signal Light control switch is in HEAD Below 1 V
    Light control switch is mot HEAD 10 to 14 V
    WNG (H12-11) - E1 (H12-24) L - W-B Headlight leveling warning signal
    (To combination meter)    		 HEADLIGHT LEVELING is indicated Below 1 V
    HEADLIGHT LEVELING is not indicated 10 to 14 V
    SPDR (H12-12) - E1 (H12-24) V - W-B Vehicle speed signal
    (From combination meter)    		 Vehicle is driving at 30 km/h (18 mph) Pulse generation
    (see waveform 1)
    RH1 (H12-13) - E1 (H12-24) B - W-B Headlight beam level control actuator RH
    (Power source circuit)    		 Power switch ON (IG) 10 to 14 V
    LH1 (H12-14) - E1 (H12-24) G - W-B Headlight beam level control actuator LH
    (Power source circuit)
    SGR (H12-20) - E1 (H12-24) Y - W-B Height control sensor
    (Ground circuit)    		 Always Below 1 V
    RH3- (H12-22) - E1 (H12-24) BR - W-B Headlight beam level control actuator RH
    (Ground circuit)
    LH3- (H12-23) - E1 (H12-24) LG - W-B Headlight beam level control actuator LH
    (Ground circuit)
    E1 (H12-24) - Body ground (Body ground) W-B - Body ground Ground
    1. Using an oscilloscope, check the waveform 1.

      Waveform 1 

      WAVEFORM 1 REFERENCE

      Item Content
      Tester Connection SPDR (H12-12) - GND (H12-24)
      Tool Setting 5 V / DIV., 20 msec. / DIV.
      Condition Vehicle is driving at approximately 30 km/h (18 mph)
      Fig 3: Identifying Waveform 1
      G04475774Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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