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Terminals Of Ecu

  1. CHECK MULTI-DISPLAY 
    Fig 1: Identifying Multi-Display ECU Connector Terminals
    G05299413Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the K46 display connector.
    2. Measure the resistance and voltage of the wire harness side connector.
      RESISTANCE AND VOLTAGE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      +B1 (K46-1) - GND1 (K46-10) O - W-B Battery Always 10 to 14 V
      ACC (K46-2) - GND1 (K46-10) GR - W-B Accessory (ON) Engine switch off Below 1 V
      ACC (K46-2) - GND1 (K46-10) GR - W-B Accessory (ON) Engine switch on (ACC) 10 to 14 V
      IG (K46-3) - GND1 (K46-10) B - W-B Ignition (ON) Engine switch off Below 1 V
      (G (K46-3) - GND1 (K46-10) B - W-B Ignition (ON) Engine switch on (IG) 10 to 14 V
      GND1 (K46-10) - Body ground W-B - Body ground Ground Always Below 1 Ω

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Reconnect the K46 display connector.
    4. Measure the voltage of the connector.
      VOLTAGE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      TC (K46-7) - GND1 (K46-10) BR - W-B Diagnosis ON signal Engine switch on (IG) 9 to 14 V
      ILL- (K46-11) - GND1 (K46-10) L - W-B Illumination signal Light control switch OFF Below 1 V
      ILL- (K46-11) - GND1 (K46-10) L - W-B Illumination signal Light control switch ON 10 to 14 V
      ILL+ (K46-12) - GND1 (K46-10) G - W-B Illumination signal Light control switch OFF Below 1 V
      ILL+ (K46-12) - GND1 (K46-10) G - W-B Illumination signal Light control switch ON 10 to 14 V
      REV (K46-13) - GND1 (K46-10) R - W-B Reverse signal See  6"Vehicle Signal Check" Mode -
      SPD (K46-14) - GND1 (K46-10) V - W-B Speed signal from combination meter See  6"Vehicle Signal Check" Mode -
      PKB (K46-23) - GND1 (K46-10) Y - W-B Parking brake signal See  6"Vehicle Signal Check" Mode -
      TSW- (K47-5) - GND1 (K46-10) W-B - W-B Telephone relation switch signal Always Below 1 V
      MACC (K47-9) - GND1 (K46-10)*2 O - W-B Microphone amplifier power supply Engine switch off Below 1 V
      MACC (K47-9) - GND1 (K46-10)*2 O - W-B Microphone amplifier power supply Engine switch on (IG) 5 V
      MIN- (K47-10) - GND1 (K46-10) R - W-B Microphone voice signal See  b"Microphone & Voice Recognition Check" -
      MIN+ (K47-11) - GND1 (K46-10) G - W-B Microphone voice signal See  b"Microphone & Voice Recognition Check" -
      CGND (K47-14) - Body ground W - Body ground Ground Always Below 1 V
      IVO- (K47-21) - GND1 (K46-10) BR - W-B Voice guidance signal Voice guidance is provided Waveform synchronized with sounds is output
      IVO+ (K47-22) - GND1 (K47-10) Y - W-B Voice guidance signal Voice guidance is provided Waveform synchronized with sounds is output
      SLD (K47-23) - GND1 (K46-10) Shielded - W-B Shielded ground Always Below 1 V
      W+ (x2-1) - GND1 (K46-10)*1 W - W-B DVD image signal DVD is played on radio receiver Pulse generation (refer to waveform 2)
      W- (x2-4) - GND1 (K46-10)*1 B - W-B Signal ground Always Below 1 V
      CA+ (K47-13) - GND1 (K46-10) B - W-B Television camera power supply Engine switch on (IG), shift lever reverse position Approx. 6 V
      CGND (K46-14) - Body ground W - Body ground Ground Always Below 1 V
      V+ (K47-27) - CGND (K47-14) R - W Television camera image signal Engine switch on (IG), shift lever reverse position Pulse generation (refer to waveform 1)
      V- (K47-28) - CGND (K47-14) Shielded - W Shielded ground Always Below 1 V

      HINT:

      *1: for DVD Changer Models

      *2: w/o LEXUS Link System

      If the result is not as specified, the multi-display may have a malfunction.

  2. CHECK RADIO RECEIVER 
    Fig 2: Identifying Radio Receiver Connector Terminals
    G05299414Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the K54 receiver connector.
    2. Measure the resistance and voltage of the wire harness side connector.
      RESISTANCE AND VOLTAGE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specification
      B (K54-1) - GND (K54-20) SB - BR Battery Always 10 to 14 V
      GND (K54-20) - Body ground BR - Body ground Ground Always Below 1 Ω
      ACC (K54-11) - GND (K54-20) GR - BR Accessory (ON) Engine switch off Below 1 V
      ACC (K54-11) - GND (K54-20) GR - BR Accessory (ON) Engine switch on (ACC) 10 to 14 V

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Reconnect the K54 receiver connector.
    4. Measure the voltage on the connectors.
      VOLTAGE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specification
      ILL+ (K54-2) - GND (K54-20) G - BR Illumination signal Engine switch on (IG), light control switch OFF Below 1 V
      ILL+ (K54-2) - GND (K54-20) G - BR Illumination signal Engine switch on (IG), light control switch TAIL or ON 10 to 14 V
      MUTE (K54-7) - GND (K54-20) SB - BR Mute signal Audio system is playing → changing mode Above 3.5 V → Below 1 V
      R+ (K54-8) - GND (K54-20) R - BR Sound signal (right) Audio system is playing Waveform synchronized with sound is output
      L+ (K54-9) - GND (K54-20) B - BR Sound signal (left) Audio system is playing Waveform synchronized with sound is output
      R- (K54-18) - GND (K54-20) G - BR Sound signal (right) Audio system is playing Waveform synchronized with sound is output
      L- (K54-19) - GND (K54-20) W - BR Sound signal (left) Audio system is playing Waveform synchronized with sound is output
      ILL- (K54-12) - GND (K54-20) W - BR Illumination signal Engine switch off Below 1 V
      ILL- (K54-12) - GND (K54-20) W - BR Illumination signal Engine switch on (IG) Pulse generation
      TX+ (K56-9) - GND (K54-20) L - BR AVC-LAN communication signal Engine switch on (ACC) 2 to 3 V
      TX- (K56-10) - GND (K54-20) LG - BR AVC-LAN communication signal Engine switch on (ACC) 2 to 3 V
      TXM+ (K53-9) - GND (K54-20) L - BR AVC-LAN communication signal Engine switch on (ACC) 2 to 3 V
      TXM- (K53-10) - GND (K54-20) LG - BR AVC-LAN communication signal Engine switch on (ACC) 2 to 3 V
      ATX+ (K54-5) - GND (K54-20) L - BR AVC-LAN communication signal Engine switch on (ACC) 2 to 3 V
      ATX- (K54-15) - GND (K54-20) LG - BR AVC-LAN communication signal Engine switch on (ACC) 2 to 3 V
      ANT (K54-13) - GND (K54-20) O - BR Power source of antenna Radio switch is ON and AM or FM 10 to 14 V
      SWG (K56-6) - GND (K54-20) LG - BR Steering pad switch ground Always Below 1 V
      SW1 (K56-7) - GND (K54-20) Y - BR Steering pad switch signal Steering pad switch not pushed 4 V or more
      SW1 (K56-7) - GND (K54-20) Y - BR Steering pad switch signal Steering pad switch SEEK+ switch pushed Below 2.5 V
      SW1 (K56-7) - GND (K54-20) Y - BR Steering pad switch signal Steering pad switch SEEK- switch pushed Approx. 0.9 V
      SW1 (K56-7) - GND (K54-20) Y - BR Steering pad switch signal Steering pad switch Vol+ switch pushed Approx. 1.5 V
      SW1 (K56-7) - GND (K54-20) Y - BR Steering pad switch signal Steering pad switch Vol+ switch pushed Approx. 0.9 V
      SW2 (K56-8) - GND (K54-20) O - BR Steering pad switch signal Steering pad switch not pushed 4 V or more
      SW2 (K56-8) - GND (K54-20) O - BR Steering pad switch signal Steering pad switch MODE switch pushed Below 2.5 V
      SW2 (K56-8) - GND (K54-20) O - BR Steering pad switch signal Steering pad switch DISP switch pushed Below 2.5 V
      NTSC (x1-1) - GND (K54-20)* W - BR DVD image signal DVD played Pulse generation (see waveform 1)
      GND (x1-2) - GND (K54-20)* B - BR Ground Always Below 1 V
      SLD (x1-3) - GND (K54-20) Shielded - BR Shielded ground Always Below 1 V

      HINT:

      *: for DVD changer models

      If the result is not as specified, the receiver may have a malfunction.
    5. Using an oscilloscope, check the waveform.

      Waveform 1 (reference) 

      WAVEFORM REFERENCE

      Item Content
      Symbols (Terminal No.) NTSC (x1-1) - Body ground
      Tool 200 mV/DIV., 10 μUs/DIV.
      Condition DVD displayed on multi-display
  3. CHECK STEREO COMPONENT AMPLIFIER (for CD Changer Models) 
    Fig 3: Identifying Oscilloscope Waveform 1
    G04948878Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 4: Identifying Stereo Component Amplifier (For CD Changer Models) Connector Terminals
    G05299416Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the U29 and U42 amplifier connectors.
    2. Measure the resistance and voltage of the connectors.
      RESISTANCE AND VOLTAGE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (U42-2) - Body ground W-B - Body ground Ground Always Below 1 Ω
      GND2 (U42-6) - Body ground W-B - Body ground Ground Always Below 1 Ω
      +B (U42-1) - GND (U42-2) SB - W-B Battery Always 10 to 14 V
      +B2 (U42-3) - GND (U42-2) SB - W-B Battery Always 10 to 14 V
      ACC (U29-12) - GND (U42-2) GR - W-B Accessory (ON) Engine switch off Below 1 V
      ACC (U29-12) - GND (U42-2) GR - W-B Accessory (ON) Engine switch on (ACC) 10 to 14 V

      If the result is not as specified, there may be a malfunction on the wire harness.

    3. Reconnect the U29 and U42 amplifier connectors.
    4. Measure the voltage of the connectors.
      VOLTAGE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      CTR+ (U44-3) - GND (U42-2) Y - W-B Sound signal Audio system is playing Waveform synchronized with sound is output
      CTR- (U44-9) - GND (U42-2) B - W-B Sound signal Audio system is playing Waveform synchronized with sound is output
      FL+ (U30-2) - GND (U42-2) P - W-B Sound signal Audio system is playing Waveform synchronized with sound is output
      FL- (U30-6) - GND (U42-2) V - W-B Sound signal Audio system is playing Waveform synchronized with sound is output
      FR+ (U30-8) - GND (U42-2) LG - W-B Sound signal Audio system is playing Waveform synchronized with sound is output
      FR- (U30-7) - GND (U42-2) L - W-B Sound signal Audio system is playing Waveform synchronized with sound is output
      RL+ (U30-3) - GND (U42-2) B - W-B Sound signal Audio system is playing Waveform synchronized with sound is output
      RL- (U30-9) - GND (U42-2) Y - W-B Sound signal Audio system is playing Waveform synchronized with sound is output
      RR+ (U30-4) - GND (U42-2) R - W-B Sound signal Audio system is playing Waveform synchronized with sound is output
      RR- (U30-10) - GND (U42-2) W - W-B Sound signal Audio system is playing Waveform synchronized with sound is output
      WFL+ (U44-1) - GND (U42-2) W - W-B Sound signal Audio system is playing Waveform synchronized with sound is output
      WFL- (U44-5) - GND (U42-2) R - W-B Sound signal Audio system is playing Waveform synchronized with sound is output
      WFR+ (U44-2) - GND (U42-2) G - W-B Sound signal Audio system is playing Waveform synchronized with sound is output
      WFR- (U44-6) - GND (U42-2) W - W-B Sound signal Audio system is playing Waveform synchronized with sound is output
      II1+ (U29-15) - GND (U42-2) Y - W-B Voice guidance signal Voice guidance is proved Waveform synchronized with sound is output
      II1- (U29-14) - GND (U42-2) BR - W-B Voice guidance signal Voice guidance is proved Waveform synchronized with sound is output
      SPD (U29-11) - GND (U42-2) V - W-B Speed signal Engine switch on (IG), drive wheels are turned slowly Pulse generation
      MUTE (U29-1) - GND (U42-2) O - W-B Mute signal Audio system is playing → change mode Above 3.5 V → Below 1 V
      TX+ (U29-8) - GND (U42-2) LG - W-B AVC-LAN communication signal Engine switch on (ACC) 2 to 3 V
      TX- (U29-7) - GND (U42-2) L - W-B AVC-LAN communication signal Engine switch on (ACC) 2 to 3 V
      R+ (U29-5) - GND (U42-2) R - W-B Sound signal (right) Audio system playing Waveform synchronized with sound is output
      R- (U29-4) - GND (U42-2) G - W-B Sound signal (right) Audio system playing Waveform synchronized with sound is output
      L+ (U29-3) - GND (U42-2) B - W-B Sound signal (left) Audio system playing Waveform synchronized with sound is output
      L- (U29-2) - GND (U42-2) W - W-B Sound signal (left) Audio system playing Waveform synchronized with sound is output
      SLD (U29-6) - GND (U42-2) Shielded - Body ground Shielded ground Always Below 1 V

      If the result is not as specified, the amplifier may have a malfunction.

  4. CHECK STEREO COMPONENT AMPLIFIER (for DVD Changer Models) 
    Fig 5: Identifying Stereo Component Amplifier (For DVD Changer Models) Connector Terminals
    G05299417Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the U31 amplifier connector.
    2. Measure the resistance and voltage of the connector.
      RESISTANCE AND VOLTAGE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (U31-16) - Body ground W-B - Body ground Ground Always Below 1 Ω
      GND2 (U31-15) - Body ground W-B - Body ground Ground Always Below 1 Ω
      +B (U31-1) - GND (U31-16) SB - W-B Battery Always 10 to 14 V
      +B2 (U31-10) - GND (U31-16) SB - W-B Battery Always 10 to 14 V
      ACC (U29-12) - GND (U31-16) GR - W-B Accessory (ON) Engine switch off Below 1 V
      ACC (U29-12) - GND (U31-16) GR - W-B Accessory (ON) Engine switch on (ACC) 10 to 14 V

      If the result is not as specified, there may be a malfunction on the wire harness.

    3. Reconnect the U31 amplifier connector.
    4. Measure the voltage of the connectors.
      VOLTAGE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      MUTE (U29-1)- GND (U31-16) O - W-B Mute signal Audio system is sounding → Changing mode Above 3.5 V → Below 1 V
      L- (U29-2) - GND (U31-16) W - W-B Sound signal (left) Audio system is playing Waveform synchronized with sounds is output
      L+ (U29-3) - GND (U31-16) B - W-B Sound signal (left) Audio system is playing Waveform synchronized with sounds is output
      R- (U29-4) - GND (U31-16) G - W-B Sound signal (right) Audio system is playing Waveform synchronized with sounds is output
      R+ (U29-5) - GND (U31-16) R - W-B Sound signal (right) Audio system is playing Waveform synchronized with sounds is output
      TX- (U29-7) - GND (U31-16) L - W-B AVC-LAN communication signal Engine switch is on (ACC) 2 to 3 V
      TX+ (U29-8) - GND (U31-16) LG - W-B AVC-LAN communication signal Engine switch is on (ACC) 2 to 3 V
      SPD (U29-11) - GND (1131-16) V - W-B Speed signal Engine switch is on (IG), drive wheels are turned slowly Pulse generation
      FL+ (U31-8) - GND (U31-16) P - W-B Sound signal Audio system is playing Waveform synchronized with sounds is output
      FR- (U31-20) - GND (U31-16) L - W-B Sound signal Audio system is playing Waveform synchronized with sounds is output
      RL- (U31-17) - GND (U31-16) Y - W-B Sound signal Audio system is playing Waveform synchronized with sounds is output
      RR- (U31-18) - GND (U31-16) W - W-B Sound signal Audio system is playing Waveform synchronized with sounds is output
      FL- (U31-19) - GND (U31-16) V - W-B Sound signal Audio system is playing Waveform synchronized with sounds is output
      FR+ (U31-9) - GND (U31-16) LG - W-B Sound signal Audio system is playing Waveform synchronized with sounds is output
      RL+ (U31-6) - GND (U31-16) B - W-B Sound signal Audio system is playing Waveform synchronized with sounds is output
      RR+ (U31-7) - GND (U31-16) R - W-B Sound signal Audio system is playing Waveform synchronized with sounds is output
      WF1+ (U31-5) - GND (U31-16) P - W-B Sound signal Audio system is playing Waveform synchronized with sounds is output
      WF1- (U31-14) - GND (U31-16) V - W-B Sound signal Audio system is playing Waveform synchronized with sounds is output
      WF2+ (U31-4) - GND (U31-16) L - W-B Sound signal Audio system is playing Waveform synchronized with sounds is output
      WF2- (U31-13) - GND (U31-16) LG - W-B Sound signal Audio system is playing Waveform synchronized with sounds is output
      CTR+ (U31-3) - GND (U31-16) Y - W-B Sound signal Audio system is playing Waveform synchronized with sounds is output
      CTR- (U31-12) - GND (U31-16) B - W-B Sound signal Audio system is playing Waveform synchronized with sounds is output
      SL+ (U30-1) - GND (U31-16) LG - W-B Sound signal Audio system is playing Waveform synchronized with sound is output
      SL- (U30-5) - GND (U31-16) L - W-B Sound signal Audio system is playing Waveform synchronized with sound is output
      SR+ (U30-2) - GND (U31-16) B - W-B Sound signal Audio system is playing Waveform synchronized with sound is output
      SR- (U30-6) - GND (U31-16) Y - W-B Sound signal Audio system is playing Waveform synchronized with sound is output
      WFL+ (U30-3) - GND (U31-16) W - W-B Sound signal Audio system is playing Waveform synchronized with sound is output
      WFL- (U30-9) - GND (U31-16) R - W-B Sound signal Audio system is playing Waveform synchronized with sound is output
      WFR+ (U30-4) - GND (U31-16) G - W-B Sound signal Audio system is playing Waveform synchronized with sound is output
      WFR- (U30-10) - GND (U31-16) W - W-B Sound signal Audio system is playing Waveform synchronized with sound is output

      If the result is not as specified, the amplifier may have a malfunction.

  5. CHECK NETWORK GATEWAY ECU 
    Fig 6: Identifying K66 Gateway ECU Connector Terminals
    G05299418Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage of the connector.
      VOLTAGE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GTX+ (K66-6) - Body ground L - Body ground AVC-LAN communication signal Engine switch on (ACC) 2 to 3 V
      GTX- (K66-21) - Body ground LG - Body ground AVC-LAN communication signal Engine switch on (ACC) 2 to 3 V
  6. CHECK MAYDAY ECU (See  TERMINALS OF ECU  ) 
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