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Terminals Of Ecu

  1. CHECK MULTI-DISPLAY 
    Fig 1: Identifying ECU Connector Terminals (Multi-Display)
    G05807571Courtesy 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 SPECIFIED CONDITIONS

      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
      IG (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 SPECIFIED CONDITIONS

      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 -
      TX- (K47-1) - TX+ (K47-2) LG-L AVC-LAN communication signal Engine switch on (ACC) 2 to 3 V
      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 "Microphone & Voice Recognition Check" -
      MIN+ (K47-11) - GND1 (K46-10) G - W-B Microphone voice signal See "Microphone & Voice Recognition Check" -
      SGND (K47-12) - GND1 (K46-10) W-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 in reverse position Approx. 6 V
      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 (K46-10) 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
      V+ (K47-27) - CGND (K47-14) R-W Television camera image signal Engine switch on (IG), shift lever in reverse position Pulse generation (refer to WAVEFORM 1 (REFERENCE) waveform 1)
      V- (K47-28) - CGND (K47-14) Shielded - W Shielded ground Always Below 1 V
      VV+ (x2-1) - GND1 (K46-10)* 1 W - W-B DVD image signal DVD is played on radio receiver Pulse generation (refer to waveform 2)
      VV- (x2-4) - GND1 (K46-10)*1 B - W-B Signal 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 ECU Connector Terminals
    G05807572Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the K54 receiver connector.
    2. Measure the voltage of the wire harness side connector.
      VOLTAGE SPECIFICATIONS

      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 V
      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 SPECIFICATIONS

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specification
      TXM+ (K53-9) - TXM- (K53-10) L - LG AVC-LAN communication signal Engine switch on (ACC) 2 to 3 V
      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
      ATX+ (K54-5) - ATX- (K54-15) L - LG AVC-LAN communication signal Engine switch on (ACC) 2 to 3 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
      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 4.5 to 5.5 V
      SW1 (K56-7) - GND (K54-20) Y - BR Steering pad switch signal Steering pad switch SEEK+ switch pushed Below 0.5 V
      SW1 (K56-7) - GND (K54-20) Y - BR Steering pad switch signal Steering pad switch SEEK- switch pushed 0.86 to 0.95 V
      SW1 (K56-7) - GND (K54-20) Y - BR Steering pad switch signal Steering pad switch VOL+ switch pushed 1.91 to 2.01 V
      SW1 (K56-7) - GND (K54-20) Y - BR Steering pad switch signal Steering pad switch VOL-switch pushed 3.23 to 3.57 V
      SW2 (K56-8) - GND (K54-20) O - BR Steering pad switch signal Steering pad switch not pushed 4.5 to 5.5 V
      SW2 (K56-8) - GND (K54-20) O - BR Steering pad switch signal Steering pad switch MODE switch pushed Below 0.5 V
      SW2 (K56-8) - GND (K54-20) O - BR Steering pad switch signal Steering pad switch ON HOOK switch pushed 0.86 to 0.95 V
      SW2 (K56-8) - GND (K54-20) O - BR Steering pad switch signal Steering pad switch OFF HOOK switch pushed 1.91 to 2.01 V
      SW2 (K56-8) - GND (K54-20) O - BR Steering pad switch signal Steering pad switch VOICE switch pushed 3.23 to 3.57 V
      TX+ (K56-9) - TX- (K56-10) L - LG AVC-LAN communication signal Engine switch on (ACC) 2 to 3 V
      ARI (K56-15) - GND (K54-20) (*2) W - BR Sound signal (Right) External device is playing (When stereo jack adapter is used) Waveform synchronized with sound is output
      ASGN (K56-16) - GND (K54-20) (*2) R - BR Ground Always Below 1 V
      ALI (K66-17) - GND (K54-20) (*2) B - BR Sound signal (Left) External device is playing (When stereo jack adapter is used) Waveform synchronized with sound is output
      AGND (K56-18) - GND (K54-20) (*2) Shielded - BR Shielded ground Always Below 1 V
      AUXI (K56-19) - GND (K54-20) (*2) L - BR External device connection detection signal External device is connected Below 1 V
      NTSC (x1-1) - GND (K54-20) (*1) W - BR DVD image signal DVD played Pulse generation (see WAVEFORM 1 (REFERENCE) waveform 1)
      GND (x1-2) - GND (K54-20) CD B - BR Ground Always Below 1 V
      SLD (x1-3) - GND (K54-20) Shielded - BR Shielded ground Always Below 1 V
      DVD (u1-1) - GND (K54-20) CD B - BR Digital sound signal DVD played on multi-display Pulse generation
      HINT:
      *1: for DVD changer models
      *2: For models with a DVD changer, the radio receiver assembly consists of a sub wire harness and radio receiver. The sub wire harness is supplied as part of the radio receiver assembly.

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

    5. Using an oscilloscope, check the waveform.

      Waveform 1 (reference) 

      WAVEFORM 1 (REFERENCE)

      Item Content
      Symbols (Terminal No.) NTSC (x1-1) - Body ground
      Tool 200 mV/DIV., 10 μs/DIV.
      Condition DVD displayed on multi-display
  3. CHECK STEREO COMPONENT AMPLIFIER (for CD Changer Models) 
    Fig 3: Identifying Waveform 1
    G04948878Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 4: Identifying Stereo Component Amplifier ECU Connector Terminals (CD Changer Models)
    G05807574Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the U29 and U42 amplifier connectors.
    2. Measure the voltage of the connectors.
      VOLTAGE SPECIFIED CONDITIONS

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (U42-2) - Body ground W-B - Body ground Ground Always Below 1 V
      GND2 (U42-6) - Body ground W-B - Body ground Ground Always Below 1 V
      +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 SPECIFIED CONDITIONS

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      FL+ (U30-2) - GND (U42-2) P - 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
      RR+ (U30-4) - GND (U42-2) R - 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- (U30-7) - GND (U42-2) L - 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
      RL- (U30-9) - GND (U42-2) Y - 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
      WF1+ (U44-1) - GND (U42-2) P - W-B Sound signal Audio system is playing Waveform synchronized with sound is output
      WF2+ (U44-2) - GND (U42-2) L - W-B Sound signal Audio system is playing Waveform synchronized with sound is output
      CTR+ (U44-3) - GND (U42-2) Y - W-B Sound signal Audio system is playing Waveform synchronized with sound is output
      WF1- (U44-5) - GND (U42-2) V - W-B Sound signal Audio system is playing Waveform synchronized with sound is output
      WF2- (U44-6) - GND (U42-2) LG - 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
      MUTE (U29-1) - GND (U42-2) O - W-B Mute signal Audio system is playing → change mode Above 3.5 V → Below 1 V
      L- (U29-2) - GND (U42-2) W - W-B Sound signal (left) 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
      R- (U29-4) - GND (U42-2) G - W-B Sound signal (right) Audio system playing Waveform synchronized with sound is output
      R+ (U29-5) - GND (U42-2) R - W-B Sound signal (right) Audio system playing Waveform synchronized with sound is output
      SLD (U29-6) - GND (U42-2) Shielded - W-B Shielded ground Always Below 1 V
      TX+ (U29-8) - TX- (U29-7) LG-L AVC - LAN communication signal Engine switch on (ACC) 2 to 3 V
      SPD (U29-11) - GND (U42-2) V - W-B Speed signal Engine switch on (IG), drive wheels are turned slowly Pulse generation
      INT- (U29-14) - GND (U42-2) BR - W-B Voice guidance signal Voice guidance is provided Waveform synchronized with sound is output
      INT+ (U29-15) - GND (U42-2) Y - W-B Voice guidance signal Voice guidance is provided Waveform synchronized with sound is output
      TMUT (U29-24) - GND (U42-2)(*1) W - W-B Mute signal Audio system is playing → LEXUS link system operating Above 3.5 V → Below 1 V
      HINT:
      *1:w/LEXUS Link System

      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 ECU Connector Terminals (DVD Changer Models)
    G05807575Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the U31 amplifier connector.
    2. Measure the voltage of the connector.
      VOLTAGE SPECIFIED CONDITIONS

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (U31-16) - Body ground W-B - Body ground Ground Always Below 1 V
      GND2 (U31-15) - Body ground W-B - Body ground Ground Always Below 1 V
      +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 SPECIFIED CONDITIONS

      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
      SLD (U29-6) - GND (U31-16) Shielded - W-B Shielded ground Always Below 1 V
      TX- (U29-7) - TX+ (U29-8) L-LG AVC-LAN communication signal Engine switch is on (ACC) 2 to 3 V
      SPD (U29-11) - GND (U31-16) V - W-B Speed signal Engine switch is on (IG), drive wheels are turned slowly Pulse generation
      INT- (U29-22) - GND (U31-16) BR - W-B Voice guidance signal Voice guidance is provided Waveform synchronized with sounds is output
      INT+ (U29-23) - GND (U31-16) Y - W-B Voice guidance signal Voice guidance is provided Waveform synchronized with sounds is output
      TMUT (U29-24) - GND (U31-16)(*1) W - W-B Mute signal Audio system is sounding → LEXUS link system operating Above 3.5 V → Below 1 V
      CTR+ (U31-3) - GND (U31-16) Y - W-B Sound signal Audio system is playing Waveform synchronized with sounds is output
      WF2+ (U31-4) - GND (U31-16) V - 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
      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
      FL+ (U31-8) - GND (U31-16) P - 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- (U31-17) - 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- (U31-20) - GND (U31-16) L - 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
      SR+ (U30-2) - GND (U31-16) B - 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
      WFR+ (U30-4) - GND (U31-16) G - 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- (U30-6) - GND (U31-16) Y - 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- (U30-10) - GND (U31-16) W - W-B Sound signal Audio system is playing Waveform synchronized with sound is output
      DVD (w1-1) - GND (U31-16) B - W-B Digital sound signal DVD played on multi-display Pulse generation
      HINT:
      *1:w/LEXUS Link System

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

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

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