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Terminals Of Ecu

WARNING: This page is about a different car, the 2007 Lexus GX 470. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK RADIO RECEIVER (w/ Navigation System) 
    Fig 1: Identifying ECU Radio Receiver (With Navigation System) Connector Terminals
    G05266070Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the R1 receiver connector.
    2. Measure the resistance and voltage according to the value(s) in the table below.
      RADIO RECEIVER (W/ NAVIGATION SYSTEM) RESISTANCE AND VOLTAGE

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specification
      R1-1 (BU) - R1-20 (GND) L-Y - BR Battery Always 11 to 14 V
      R1-20 (GND) - Body ground BR - Body ground Ground Always Below 1 Ω
      R1-11 (ACC) - R1-20 (GND) GR - BR Accessory (ON) Ignition switch OFF Below 1 V
      R1-11 (ACC) - R1-20 (GND) GR - BR Accessory (ON) Ignition switch ACC 11 to 14 V

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

    3. Reconnect the R1 receiver connector.
    4. Measure the voltage according to the value(s) in the table below.
    RADIO RECEIVER (W/ NAVIGATION SYSTEM) VOLTAGE

    Terminal No. (Symbols) Wiring Color Terminal Description Condition Specification
    R1-2 (ILL+) - R1-20 (GND) G - BR Illumination signal Ignition switch ON, light control switch OFF Below 1 V
    R1-2 (ILL+) - R1-20 (GND) G - BR Illumination signal Ignition switch ON, light control switch TAIL or ON 11 to 14 V
    R1-7 (MUTE) - R1-20 (GND) B-W - BR Mute signal Audio system is playing → changing mode Above 3.5 V → Below 1 V
    R1-8 (R+) - R1-20 (GND) R - BR Sound signal (right) Audio system is playing Waveform synchronized with sound is output
    R1-9 (L+) - R1-20 (GND) B - BR Sound signal (left) Audio system is playing Waveform synchronized with sound is output
    R1-18 (R-) - R1-20 (GND) G - BR Sound signal (right) Audio system is playing Waveform synchronized with sound is output
    R1-19 (L-) - R1-20 (GND) W-BR Sound signal (left) Audio system is playing Waveform synchronized with sound is output
    R1-12 (ILL-) - R1-20 (GND) W-G - BR Illumination signal Ignition switch OFF Below 1 V
    R1-12 (ILL-) - R1-20 (GND) W-G - BR Illumination signal Ignition switch ON Pulse generation
    R2-9 (TX+) - R1-20 (GND) B - BR AVC-LAN communication signal Ignition switch ACC 2 to 3 V
    R2-10 (TX-) - R1-20 (GND) W - BR AVC-LAN communication signal Ignition switch ACC 2 to 3 V
    R3-9 (TX+) - R1-20 (GND) L - BR AVC-LAN communication signal Ignition switch ACC 2 to 3 V
    R3-10 (TX-) - R1-20 (GND) LG - BR AVC-LAN communication signal Ignition switch ACC 2 to 3 V
    R1-5 (ATX+) - R1-20 (GND) P-BR AVC-LAN communication signal Ignition switch ACC 2 to 3 V
    R1-15 (ATX-) - R1-20 (GND) V - BR AVC-LAN communication signal Ignition switch ACC 2 to 3 V
    R1-13 (ANT) - R1-20 (GND) B - BR Power source of antenna Radio switch is ON and AM or FM 11 to 14 V
    R2-6 (SWGND) - R1-20 (GND) W - BR Steering pad switch ground Always Below 1 V
    R2-7 (STSW1) - R1-20 (GND) LG-R - BR Steering pad switch signal Steering pad switch not pushed 4 V or more
    R2-7 (STSW1) - R1-20 (GND) LG-R - BR Steering pad switch signal Steering pad switch SEEK+ switch pushed Below 2.5 V
    R2-7 (STSW1) - R1-20 (GND) LG-R - BR Steering pad switch signal Steering pad switch SEEK- switch pushed Approx. 0.9 V
    R2-7 (STSW1) - R1-20 (GND) LG-R - BR Steering pad switch signal Steering pad switch Vol+ switch pushed Approx. 1.5 V
    R2-7 (STSW1) - R1-20 (GND) LG-R - BR Steering pad switch signal Steering pad switch Vol+ switch pushed Approx. 0.9 V
    R2-8 (STSW2) - R1-20 (GND) P-B - BR Steering pad switch signal Steering pad switch not pushed 4 V or more
    R2-8 (STSW2) - R1-20 (GND) P-B - BR Steering pad switch signal Steering pad switch MODE switch pushed Below 2.5 V
    R2-8 (STSW2) - R1-20 (GND) P-B - BR Steering pad switch signal Steering pad switch DISP switch pushed Below 2.5 V
    R2-15 (ARI) - R1-20 (GND) R-BR Sound signal (Right) External device is playing (When stereo jack is used) A waveform synchronized with sounds is output
    R2-16 (ASGN) - R1-20 (GND) Shielded - Body ground Shield ground Always Below 1 V
    R2-17 (ALI) - R1-20 (GND) G - BR Sound signal (Left) External device is playing (When stereo jack is used) A waveform synchronized with sounds is output
    R2-19 (AUXI) - R1-20 (GND) W - BR External device connection detection signal External device is connection Below 1 V

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

  2. CHECK RADIO RECEIVER (w/o Navigation System) 
    Fig 2: Identifying Radio Receiver (Without Navigation System) Connector Terminals
    G05266071Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the R1 receiver connector.
    2. Measure the resistance and voltage according to the value(s) in the table below.
      CHECK RADIO RECEIVER (W/O NAVIGATION SYSTEM) RESISTANCE AND VOLTAGE

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specification
      R1-1 (B) - R1-20 (GND) L-Y - BR Battery Always 11 to 14 V
      R1-20 (GND) - Body ground BR - Body ground Ground Always Below 1 Ω
      R1-11 (ACC) - R1-20 (GND) GR - BR Accessory (ON) Ignition switch OFF Below 1 V
      R1-11 (ACC) - R1-20 (GND) GR - BR Accessory (ON) Ignition switch ACC 11 to 14 V

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

    3. Reconnect the R1 receiver connector.
    4. Measure the voltage according to the value(s) in the table below.
    CHECK RADIO RECEIVER (W/O NAVIGATION SYSTEM) VOLTAGE

    Terminal No. (Symbols) Wiring Color Terminal Description Condition Specification
    R1-2 (ILL+) - R1-20 (GND) G - BR Illumination signal Ignition switch ON, light control switch OFF Below 1 V
    R1-2 (ILL+) - R1-20 (GND) G - BR Illumination signal Ignition switch ON, light control switch TAIL or ON 11 to 14 V
    R1-7 (MUTE) - R1-20 (GND) B-W - BR Mute signal Audio system is playing → changing mode Above 3.5 V → Below 1 V
    R1-8 (R+) - R1-20 (GND) R - BR Sound signal (right) Audio system is playing Waveform synchronized with sound is output
    R1-9 (L+) - R1-20 (GND) B - BR Sound signal (left) Audio system is playing Waveform synchronized with sound is output
    R1-18 (R-) - R1-20 (GND) G - BR Sound signal (right) Audio system is playing Waveform synchronized with sound is output
    R1-19 (L-) - R1-20 (GND) W - BR Sound signal (left) Audio system is playing Waveform synchronized with sound is output
    R1-12 (ILL-) - R1-20 (GND) W-G - BR Illumination signal Ignition switch OFF Below 1 V
    R1-12 (ILL-) - R1-20 (GND) W-G - BR Illumination signal Ignition switch ON Pulse generation
    R3-9 (TX+) - R1-20 (GND)* L - BR AVC-LAN communication signal Ignition switch ACC 2 to 3 V
    R3-10 (TX-) - R1-20 (GND)* LG - BR AVC-LAN communication signal Ignition switch ACC 2 to 3 V
    R1-5 (ATX+) - R1-20 (GND) L - BR AVC-LAN communication signal Ignition switch ACC 2 to 3 V
    R1-15 (ATX-) - R1-20 (GND) LG - BR AVC-LAN communication signal Ignition switch ACC 2 to 3 V
    R1-13 (ANT) - R1-20 (GND) B - BR Power source of antenna Radio switch is ON and AM or FM 11 to 14 V
    R2-6 (SWGND) - R1-20 (GND) W - BR Steering pad switch ground Always Below 1 V
    R2-7 (STSW1) - R1-20 (GND) LG-R - BR Steering pad switch signal Steering pad switch not pushed 4 V or more
    R2-7 (STSW1) - R1-20 (GND) LG-R - BR Steering pad switch signal Steering pad switch SEEK+ switch pushed Below 2.5 V
    R2-7 (STSW1) - R1-20 (GND) LG-R - BR Steering pad switch signal Steering pad switch SEEK- switch pushed Approx. 0.9 V
    R2-7 (STSW1) - R1-20 (GND) LG-R - BR Steering pad switch signal Steering pad switch Vol+ switch pushed Approx. 1.5 V
    R2-7 (STSW1) - R1-20 (GND) LG-R - BR Steering pad switch signal Steering pad switch Vol+ switch pushed Approx. 0.9 V
    R2-8 (STSW2) - R1-20 (GND) P-B - BR Steering pad switch signal Steering pad switch not pushed 4 V or more
    R2-8 (STSW2) - R1-20 (GND) P-B - BR Steering pad switch signal Steering pad switch MODE switch pushed Below 2.5 V
    R2-8 (STSW2) - R1-20 (GND) P-B - BR Steering pad switch signal Steering pad switch DISP switch pushed Below 2.5 V
    R2-15 (ARI) - R1-20 (GND) R - BR Sound signal (Right) External device is playing (When stereo jack is used) A waveform synchronized with sounds is output
    R2-16 (ASGN) - R1-20 (GND) Shielded - Body ground Shield ground Always Below 1 V
    R2-17 (ALI) - R1-20 (GND) G-BR Sound signal (Left) External device is playing (When stereo jack is used) A waveform synchronized with sounds is output
    R2-19 (AUXI) - R1-20 (GND) W-BR External device connection detection signal External device is connection Below 1 V
    HINT:
    *: w/ Rear Seat Entertainment System
    If the result is not as specified, the receiver may have a malfunction.
  3. CHECK STEREO COMPONENT AMPLIFIER (w/ Navigation System) 
    Fig 3: Identifying Stereo Component Amplifier (With Navigation System) Connector Terminals
    G05266072Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the S39 and S42 amplifier connectors.
    2. Measure the resistance and voltage according to the value(s) in the table below.
      STEREO COMPONENT AMPLIFIER (W/ NAVIGATION SYSTEM) RESISTANCE AND VOLTAGE

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      S42-2 (GND) - Body ground BR - Body ground Ground Always Below 1 Ω
      S42-6 (E) - Body ground BR - Body ground Ground Always Below 1 Ω
      S42-1 (+B) - S42-2 (GND) R-L - BR Battery Always 11 to 14 V
      S42-3 (+B2) - S42-2 (GND) R-L - BR Battery Always 11 to 14 V
      S39-12 (ACC) - S42-2 (GND) GR - BR Accessory (ON) Ignition switch OFF Below 1 V
      S39-12 (ACC) - S42-2 (GND) GR - BR Accessory (ON) Ignition switch ACC 11 to 14 V

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

    3. Reconnect the S39 and S42 amplifier connectors.
    4. Measure the voltage according to the value(s) in the table below.
    STEREO COMPONENT AMPLIFIER (W/ NAVIGATION SYSTEM) VOLTAGE

    Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
    S41-3 (CTR+) - S42-2 (GND) G - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S41-9 (CTR-) - S42-2 (GND) G-B - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S43-2 (FL+) - S42-2 (GND) P - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S43-6 (FL-) - S42-2 (GND) V - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S43-8 (FR+) - S42-2 (GND) Y - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S43-7 (FR-) - S42-2 (GND) B-BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S43-3 (RL+) - S42-2 (GND) B - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S43-9 (RL-) - S42-2 (GND) Y - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S43-4 (RR+) - S42-2 (GND) R - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S43-10 (RR-) - S42-2 (GND) W - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S41-4 (WFL+) - S42-2 (GND) G - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S41-10 (WFL-) - S42-2 (GND) G-B - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S43-1 (WFR+) - S42-2 (GND) L - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S43-5 (WFR-) - S42-2 (GND) LG - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S41-1 (WF1+) - S42-2 (GND) L-R - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S41-5 (WF1-) - S42-2 (GND) L-B - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S41-2 (SR+) - S42-2 (GND) R - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S41-6 (SR-) - S42-2 (GND) W - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S41-8 (SL+) - S42-2 (GND) B - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S41-7 (SL-) - S42-2 (GND) Y - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S39-15 (INT+) - S42-2 (GND) L - BR Voice guidance signal Voice guidance is proved Waveform synchronized with sound is output
    S39-14 (INT-) - S42-2 (GND) P - BR Voice guidance signal Voice guidance is proved Waveform synchronized with sound is output
    S39-11 (SPD) - S42-2 (GND) V-R - BR Speed signal Ignition switch ON, drive wheels are turned slowly Pulse generation
    S39-1 (MUTE) - S42-2 (GND) B - BR Mute signal Audio system is playing → change mode Above 3.5 V → Below 1 V
    S39-24 (TMUT) - S42-2 (GND)* G-R - BR Mute signal Audio system is playing → change mode Above 3.5 V → Below 1 V
    S39-8 (TX+) - S42-2 (GND) L - BR AVC-LAN communication signal Ignition switch ACC 2 to 3 V
    S39-7 (TX-) - S42-2 (GND) LG - BR AVC-LAN communication signal Ignition switch ACC 2 to 3 V
    S39-5 (R+) - S42-2 (GND) R - BR Sound signal (right) Audio system playing Waveform synchronized with sound is output
    S39-4 (R-) - S42-2 (GND) G - BR Sound signal (right) Audio system playing Waveform synchronized with sound is output
    S39-3 (L+) - S42-2 (GND) B - BR Sound signal (left) Audio system playing Waveform synchronized with sound is output
    S39-2 (L-) - S42-2 (GND) W - BR Sound signal (left) Audio system playing Waveform synchronized with sound is output
    S39-6 (ASGD) - S42-2 (GND) Shielded - Body ground Shielded ground Always Below 1 V
    S39-18 (SLD1) - S42-2 (GND) Shielded - Body ground Shielded ground Always Below 1 V
    HINT:
    *: w/ LEXUS Link System

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

  4. CHECK STEREO COMPONENT AMPLIFIER (w/o Navigation System) 
    Fig 4: Identifying Stereo Component Amplifier (W/O Navigation System) Connector Terminals
    G05266073Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the S39 and S42 amplifier connectors.
    2. Measure the resistance and voltage according to the value(s) in the table below.
      STEREO COMPONENT AMPLIFIER (W/O NAVIGATION SYSTEM) RESISTANCE AND VOLTAGE

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      S42-2 (GND) - Body ground BR - Body ground Ground Always Below 1 Ω
      S42-6 (E) - Body ground BR - Body ground Ground Always Below 1 Ω
      S42-1 (+B) - S42-2 (GND) R-L - BR Battery Always 11 to 14 V
      S42-3 (+B2) - S42-2 (GND) R-L - BR Battery Always 11 to 14 V
      S39-12 (ACC) - S42-2 (GND) GR - BR Accessory (ON) Ignition switch OFF Below 1 V
      S39-12 (ACC) - S42-2 (GND) GR - BR Accessory (ON) Ignition switch ACC 11 to 14 V

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

    3. Reconnect the S39 and S42 amplifier connectors.
    4. Measure the voltage according to the value(s) in the table below.
    STEREO COMPONENT AMPLIFIER (W/O NAVIGATION SYSTEM) VOLTAGE

    Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
    S41-3 (CTR+) - S42-2 (GND)*2 G - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S41-9 (CTR-) - S42-2 (GND)*2 G-B - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S43-2 (ML+) - S42-2 (GND) P - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S43-6 (ML-) - S42-2 (GND) V - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S43-8 (MR+) - S42-2 (GND) Y - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S43-7 (MR-) - S42-2 (GND) B - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S43-3 (RL+) - S42-2 (GND)*2 B - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S43-9 (RL-) - S42-2 (GND)*2 Y - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S43-4 (RR+) - S42-2 (GND)*2 R - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S43-10 (RR-) - S42-2 (GND)*2 W - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S40-3 (RL+) - S42-2 (GND)*1 B - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S40-9 (RL-) - S42-2 (GND)*1 Y - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S40-4 (RR+) - S42-2 (GND)*1 R - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S40-10 (RR-) - S42-2 (GND)*1 W - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S40-2 (FL+) - S42-2 (GND) G - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S40-6 (FL-) - S42-2 (GND) G-B - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S40-1 (FR+) - S42-2 (GND) L - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S40-5 (FR-) - S42-2 (GND) LG - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S41-1 (WF1+) - S42-2 (GND) L-R - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S41-5 (WF1-) - S42-2 (GND) L-B - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S41-2 (WF2+) - S42-2 (GND)*1 L - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S41-6 (WF2-) - S42-2 (GND)*1 LG - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S41-2 (SR+) - S42-2 (GND)*2 R - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S41-6 (SR-) - S42-2 (GND)*2 W - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S41-8 (SL+) - S42-2 (GND)*2 B - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S41-7 (SL-) - S42-2 (GND)*2 Y - BR Sound signal Audio system is playing Waveform synchronized with sound is output
    S39-11 (SPD) - S42-2 (GND) V-R - BR Speed signal Ignition switch ON, drive wheels are turned slowly Pulse generation
    S39-1 (MUTE) - S42-2 (GND) B-BR Mute signal Audio system is playing → change mode Above 3.5 V → Below 1 V
    S39-24 (TMUT) - S42-2 (GND)*3 G-R - BR Mute signal Audio system is playing → change mode Above 3.5 V → Below 1 V
    S39-8 (TX+) - S42-2 (GND) L - BR AVC-LAN communication signal Ignition switch ACC 2 to 3 V
    S39-7 (TX-) - S42-2 (GND) LG - BR AVC-LAN communication signal Ignition switch ACC 2 to 3 V
    S39-5 (R+) - S42-2 (GND) R - BR Sound signal (right) Audio system playing Waveform synchronized with sound is output
    S39-4 (R-) - S42-2 (GND) G - BR Sound signal (right) Audio system playing Waveform synchronized with sound is output
    S39-3 (L+) - S42-2 (GND) B - BR Sound signal (left) Audio system playing Waveform synchronized with sound is output
    S39-2 (L-) - S42-2 (GND) W - BR Sound signal (left) Audio system playing Waveform synchronized with sound is output
    S39-6 (ASGD) - S42-2 (GND) Shielded - Body ground Shielded ground Always Below 1 V
    HINT:
    *1: for 9 Speaker Models
    *2: for 12 Speaker Models
    *3: w/ LEXUS Link System

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

  5. CHECK TELEVISION DISPLAY (See  TERMINALS OF ECU   ) 
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