LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2007 >> GS 430 >> Repair and Diagnosis >> Accessories & Equipment >> Infotainment >> Navigation >> Navigation System >> Terminals Of Ecu
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Terminals Of Ecu

  1. CHECK MULTI-DISPLAY 
    Fig 1: Identifying Multi-Display Connectors
    G05299748Courtesy 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 SPECIFICATIONS

      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 or IG) 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.
      WIRING COLOR AND TERMINAL DESCRIPTION

      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) O - W-B Microphone amplifier power supply Engine switch off Below 1 V
      MACC (K47-9) - GND1 (K46-10) 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  8"Microphone & Voice Recognition Check" -
      MIN+ (K47-11) - GND1 (K46-10) G - W-B Microphone voice signal See  8"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 (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
      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)
      V- (K47-28) - CGND (K47-14) Shielded - W Shielded ground Always Below 1 V
      VV+ (x2-1) - GND1 (K46-10) * W - W-B DVD image signal DVD is played on radio receiver Pulse generation (refer to waveform 2)
      VV- (x2-4) - GND1 (K46-10) * B - W-B Signal ground Always Below 1 V
      TX- (h1-1) - GND (h1-6) W - B-B AVC-LAN communication signal Engine switch on (ACC) 2 to 3 V
      TX+ (h1-2) - GND (h1-6) W - B-B AVC-LAN communication signal Engine switch on (ACC) 2 to 3 V
      MSLD (h1-3) - GND (h1-61) Shielded - B Shielded ground Always Below 1 V
      MIC- (h1-4) - GND (h1-6) L - B Microphone voice signal See  8"Microphone & Voice Recognition Check" -
      MIC+ (h1-5) - GND (h1-6) R - B Microphone voice signal See  8"Microphone & Voice Recognition Check" -
      GND (h1-6) - Body ground G - Body ground Ground Always Below 1 V
      ADET (h1-7) - GND (h1-6) O - B Accessory (ON) Engine switch off Below 1 V
      ADET (h1-7) - GND (h1-6) O - B Accessory (ON) Engine switch on (ACC) 10 to 14 V
      +B (h1-8) - GND (h1-6) R - B Battery Always 10 to 14 V
      IVI- (h1-10) - GND (h1-6) L - B Voice guidance signal Voice guidance is provided Waveform synchronized with sounds is input
      IVI+ (h1-11) - GND (h1-6) R - B Voice guidance signal Voice guidance is provided Waveform synchronized with sounds is input
      REV (h1-15) - GND (h1-6) GR-B Reverse signal See  4"Vehicle Sensors" Mode -
      SPD (h1-16) - GND (h1-6) W - B Speed signal See  4"Vehicle Sensors" Mode -
      GVIF (h2-1) - GND (h1-6) W - B Digital image signal Navigation display ON Pulse generation
      HINT:
      *: for DVD changer models
      If the result is not as specified, the multi-display may have a malfunction.
    5. Using an oscilloscope, check the waveform 1.

      Waveform 1 (reference) 

      WAVEFORM REFERENCE

      Item Content
      Symbols (Terminal No.) V+ (K47-27) - CGND (K47-14)
      Tool 0.2 V/DIV., 0.2 μs/DIV.
      Condition Engine switch on (IG), shift lever in reverse position
      Fig 2: Oscilloscope Waveform Signal 1
      G04945285Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Using an oscilloscope, check the waveform 2.

      Waveform 2 (reference) 

      WAVEFORM REFERENCE

      Item Content
      Symbols (Terminal No.) W+ (x2-1) - GND1 (K46-10)
      Tool 0.2 V/DIV, 0.2 μs/DIV.
      Condition Disc is played on multi-display
      Fig 3: Oscilloscope Waveform Signal 2
      G04945286Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. CHECK NAVIGATION ECU 
    Fig 4: Identifying Navigation ECU Connectors Terminals
    G05299751Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage of the connector.
      WIRING COLOR AND TERMINAL DESCRIPTION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      TX- (h1-1) - GND (h1-6) W-B - B AVC-LAN communication signal Engine switch on (ACC) 2 to 3 V
      TX+ (h1-2) - GND (h1-6) W-B - B AVC-LAN communication signal Engine switch on (ACC) 2 to 3 V
      MSLD (h1-3) - GND (h1-61) Shielded - B Shielded ground Always Below 1 V
      MIC- (h1-4) - GND (h1-6) L - B Microphone voice signal See  8"Microphone & Voice Recognition Check" -
      MIC+ (h1-5) - GND (h1-6) R - B Microphone voice signal See  8"Microphone & Voice Recognition Check" -
      GND (h1-6) - Body ground G - Body ground Ground Always Below 1 V
      ADET (h1-7) - GND (h1-6) O - B Accessory (ON) Engine switch off Below 1 V
      ADET (h1-7) - GND (h1-6) O - B Accessory (ON) Engine switch on (ACC) 10 to 14 V
      +B (h1-8) - GND (h1-6) R - B Battery Always 10 to 14 V
      IVI- (h1-10) - GND (h1-6) L - B Voice guidance signal Voice guidance is provided A waveform synchronized with sounds is output
      IVI+ (h1-11) - GND (h1-6) R - B Voice guidance signal Voice guidance is provided A waveform synchronized with sounds is output
      REV (h1-15) - GND (h1-6) GR-B Reverse signal See  4"Vehicle Sensors" Mode -
      SPD (h1-16) - GND (h1-6) W - B Speed signal See  4"Vehicle Sensors" Mode -
      GVIF (q1-1) - GND (h1-6) W - B Digital image signal Navigation display ON Pulse generation
  3. CHECK GATEWAY ECU 
    Fig 5: Identifying Gateway ECU Connector Terminals
    G05299752Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage of the connector.
      WIRING COLOR AND TERMINAL DESCRIPTION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GTX- (K66-21) - GND (K66-24) LG - W-B AVC-LAN communication signal Engine switch on (ACC) 2 to 3 V
      GTX+ (K66-6) - GND (K66-24) L - W-B AVC-LAN communication signal Engine switch on (ACC) 2 to 3 V
  4. CHECK RADIO RECEIVER (See  TERMINALS OF ECU  ) 
  5. CHECK STEREO COMPONENT AMPLIFIER (See  TERMINALS OF ECU  ) 
  6. CHECK MAYDAY ECU (See  TERMINALS OF ECU  ) 
scientia non olet · About LEMON Manuals