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Terminals Of Ecu

  1. CHECK RADIO RECEIVER (w/Navigation System) 
    Fig 1: Identifying Radio Receiver Connector Terminals (W/Navigation System)
    G05846375Courtesy 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.
      RESISTANCE AND VOLTAGE SPECIFICATIONS

      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.
      VOLTAGE SPECIFICATIONS

      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 15 V
      R2-7 (STSW1) - R1-20 (GND) LG-R - BR Steering pad switch signal Steering pad switch Vol+ switch pushed Approx 0 9V
      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 5V
      R2-8 (STSW2) - R1-20 (GND) P-B - BR Steering pad switch signal Steering pad switch DISP switch pushed Below 2 5V
      R2-15 (AR1) - 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 (AL1) - 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 (AUX1) - R1-20 (GND) W-BR External device connection detection signal External device is connection Below 1 V
      R3-6 (MUTE) - R1-20 (GND) L-B - BR Mute signal Audio system is playing → changing mode Above 3 5 V → Below 1 V
      R3-2 (R+) - R1-20 (GND) B-BR Sound signal (right) Audio system is playing Waveform synchronized with sound is output
      R3-4 (L+) - R1-20 (GND) R-BR Sound signal (left) Audio system is playing Waveform synchronized with sound is output
      R3-3 (R-) - R1-20 (GND) W-BR Sound signal (right) Audio system is playing Waveform synchronized with sound is output
      R3-5 (L-) - R1-20 (GND) G-BR Sound signal (left) Audio system is playing Waveform synchronized with sound is output
      R3-1 (SGND) - Body ground Shielded - Body ground Shield ground Always 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 Connector Terminals (W/O Navigation System)
    G05846376Courtesy 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.
      RESISTANCE AND VOLTAGE SPECIFICATIONS

      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
      VOLTAGE SPECIFICATION

      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 5V
      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 15 V
      R2-7 (STSW1) - R1-20 (GND) LG-R - BR Steering pad switch signal Steering pad switch Vol+ switch pushed Approx 09 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 5V
      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 (AR1) - 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 (AL1) - 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 (AUX1) - R1-20 (GND) W-BR External device connection detection signal External device is connection Below 1 V
      R3-6 (MUTE) - R1-20 (GND) L-B - BR Mute signal Audio system is playing → changing mode Above 3 5 V → Below 1 V
      R3-2 (R+) - R1-20 (GND) B-BR Sound signal (right) Audio system is playing Waveform synchronized with sound is output
      R3-4 (L+) - R1-20 (GND) R-BR Sound signal (left) Audio system is playing Waveform synchronized with sound is output
      R3-3 (R-) - R1-20 (GND) W-BR Sound signal (right) Audio system is playing Waveform synchronized with sound is output
      R3-5 (L-) - R1-20 (GND) G-BR Sound signal (left) Audio system is playing Waveform synchronized with sound is output
      R3-1 (SGND) - Body ground Shielded - Body ground Shield ground Always 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 Connector Terminals (W/Navigation System)
    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.
      RESISTANCE AND VOLTAGE SPECIFIED CONDITIONS

      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.
      VOLTAGE SPECIFIED CONDITION

      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 Connector Terminals (W/O Navigation System)
    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.
      RESISTANCE AND VOLTAGE SPECIFIED CONDITIONS

      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.
      VOLTAGE SPECIFIED CONDITION

      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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