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Terminals Of Ecu: Notes

WARNING: This page is about a different car, the 2002 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
  1. MULTI DISPLAY 
    Fig 1: Identifying Lexus Navigation System Multi Display Screen Connectors & Terminals
    G03150383Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    LEXUS NAVIGATION SYSTEM MULTI DISPLAY SCREEN CONNECTOR TERMINALS IDENTIFICATION

    Symbols (Terminals No.) Wiring Color Condition STD Voltage (V)
    M3-1 - M3-6 (+B1 - GND1) R-G - W-B Constant 10 - 14 V
    M3-2 - M3-6 (IG - GND1) LG-R - W-B Ignition switch OFF or ACC Below 1 V
    Ignition switch ON 10 - 14 V
    M3-4 - M3-6 (ACC - GND1) GR - W-B Ignition switch OFF Below 1 V
    Ignition switch ACC or ON 10 - 14 V
    M3-6 - Body ground (GND1 - Body ground) W-B - Body ground Constant Below 1 V
    M4-3 (TX+) G (1) See  SERVICE CHECK MODE under PRE-CHECK -
    M4-5 - M3-6 (SPD - GND1) V-W - W-B See VEHICLE SIGNAL CHECK MODE in  DISPLAY CHECK MODE under PRE-CHECK -
    M4-7 - M3-6 (PBEW - GND1) L - W-B Passenger seat belt buckle switch OFF (Belt unfastened) Below 1 V
    Passenger seat belt buckle switch ON (Belt fastened) 10 - 14 V
    M4-10 (TX-) R (1) See  SERVICE CHECK MODE under PRE-CHECK -
    M4-13 - M3-6 (PKB - GND1) LG - W-B See VEHICLE SIGNAL CHECK MODE in  DISPLAY CHECK MODE under PRE-CHECK -
    M4-14 - M3-6 (TC - GND1) R-B - W-B Ignition switch OFF and connect terminals TC and CG of DLC3. Below 1 V
    M5-1 - M5-6 (VR - VG) Y - Shielded Ignition switch OFF Below 1 V
    M5-2 - M5-6 (R - VG) R - Shielded Navigation map is switched Pulse generation (See Oscilloscope Waveform No. 2  under PULSE GENERATION)
    M5-3 - M5-6 (B - VG) B - Shielded Navigation map is switched Pulse generation (See Oscilloscope Waveform No. 2  under PULSE GENERATION)
    M5-6 - M3-6 (VG - GND1) Shielded - W-B Ignition switch OFF Below 1 V
    M5-7 - M5-6 (G - VG) W - Shielded Navigation map is switched Pulse generation (See Oscilloscope Waveform No. 2  under PULSE GENERATION)
    M5-8 - M5-6 (SYNC - VG) G - Shielded Navigation display is displayed Pulse generation (See Oscilloscope Waveform No. 1  under PULSE GENERATION)
    (1) With Lexus Navigation System.
    MULTI DISPLAY SCREEN CONNECTOR TERMINAL PROBLEM SYMPTOM IDENTIFICATION

    Terminal No. (Symbols) Problem Symptom When Open Circuit Is Detected. Problem Symptom When Short Circuit Is Detected.
    M3-1 - M3-6 (+B1 - GND1) Navigation system does not operate. Navigation system does not operate.
    M3-2 - M3-6 (IG - GND1) Navigation system does not operate. Navigation system does not operate.
    M3-4 - M3-6 (ACC - GND1) Navigation system does not operate. Navigation system does not operate.
    M3-6 - Body ground (GND1 - Body ground) Navigation system does not operate. Navigation system is normal.
    M4-3 (TX+) Screen is in disorder. Screen is in disorder.
    M4-5 - M3-6 (SPD - GND1) All switch operation is available during driving. All switch operation is available during driving.
    M4-7 - M3-6 (PBEW - GND1) Passenger seat belt warning does not light up. Passenger seat belt warning remains lit.
    M4-10 (TX-) Screen is in disorder. Screen is in disorder.
    M4-13 - M3-6 (PKB - GND1) The system can not enter diagnosis system mode. Navigation system is normal.
    M4-14 - M3-6 (TC - GND1) Navigation system is normal. The system can not exit service check mode.
    M5-1 - M5-6 (VR - VG) Screen noise or other types of noise occur. Screen noise or other types of noise occur.
    M5-2 - M5-6 (R - VG) Screen color turns to blue. Screen color turns to blue.
    M5-3 - M5-6 (B - VG) Screen color turns to yellow. Screen color turns to yellow.
    M5-6 - M3-6 (VG - GND1) Screen noise or other types of noise occur. Navigation system is normal.
    M5-7 - M5-6 (G - VG) Screen color turns to red-purple. Screen color turns to red-purple.
    M5-8 - M5-6 (SYNC - VG) Synchronous pulse fluctuates rapidly in map screen. Synchronous pulse fluctuates slowly in map screen.
  2. NAVIGATION ECU 
    Fig 2: Identifying Navigation System ECU Connectors & Terminals
    G03150386Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    NAVIGATION ECU CONNECTOR TERMINALS IDENTIFICATION

    Symbols (Terminals No.) Wiring Color Condition STD Voltage (V)
    N4-1 - N4-17 (AUI+ - GND) P (1) - W-B Audio system is sounding A waveform synchronized with sounds is output
    N4 2 (AUO+) P (1) Sound quality test -
    N6-3 - N4-17 (MI1+ - GND) Y - W-B Ignition switch OFF Below 1 V
    N4-5 - N4-17 (SPD - GND) Y-R (1) - W-B See VEHICLE SIGNAL CHECK MODE in  DISPLAY CHECK MODE under PRE-CHECK -
    N6-4 - N4-17 (MACC - GND) LG - W-B Ignition switch ACC 5 V
    N4-9 - N4-17 (+B - GND) L-Y - W-B Constant 10 - 14 V
    N4-10 - N4-17 (AUI- - GND) V (1) Audio system is sounding A waveform synchronized with sounds is output
    N4-11 (AUO-) V (1) Sound quality test -
    N6-5 - N4-17 (MIC- - GND) BR - W-B Ignition switch OFF Below 1 V
    N4-14 (REV) L See VEHICLE SIGNAL CHECK MODE in  DISPLAY CHECK MODE under PRE-CHECK -
    N4-15 - N4-17 (NVMU - GND) G-R - W-B Navigation voice sounding Below 1 V
    N4-17 - Body ground (GND - Body ground) W-B - Body ground Constant Below 1 V
    N4-18 - N4-17 (ACC - GND) GR - W-B Ignition switch OFF Below 1 V
    Ignition switch ACC or ON 10 - 14 V
    N5-1 - N5-6 (VR - VG) Y - Shielded Ignition switch OFF Below 1 V
    N5-2 - N5-6 (R - VG) R - Shielded Navigation map is switched Pulse generation (See Oscilloscope Waveform No. 2  under PULSE GENERATION)
    N5-3 - N5-6 (B - VG) B - Shielded Navigation map is switched Pulse generation (See Oscilloscope Waveform No. 2  under PULSE GENERATION)
    N5-5 (TX+) L (1) See  SERVICE CHECK MODE under PRE-CHECK -
    N5-6 - N4-17 (VG - GND) Shielded - W-B Ignition switch OFF Below 1 V
    N5-7 - N5-6 (G - VG) W - Shielded Navigation map is switched Pulse generation (See Oscilloscope Waveform No. 2  under PULSE GENERATION)
    N5-8 - N5-6 (SYNC - VG) G - Shielded Navigation display is displayed Pulse generation (See Oscilloscope Waveform No. 1  under PULSE GENERATION)
    N5-10 (TX-) LG (1) See  SERVICE CHECK MODE under PRE-CHECK -
    (1) With Lexus Navigation System.
    NAVIGATION ECU CONNECTOR TERMINAL PROBLEM SYMPTOM IDENTIFICATION

    Terminal No. (Symbols) Problem Symptom When Open Circuit Is Detected. Problem Symptom When Short Circuit Is Detected.
    N4-1 - N4-17 (AUI+ - GND) Driver side speaker does not sound. Driver side speaker does not sound.
    N4-2 (AUO+) Navigation voice does not sound. Navigation voice does not sound.
    N4-3 - N4-17 (MI1+ - GND) Voice from cellular phone cannot be heard.
    Voice cannot be recognized.    		 Voice from cellular phone cannot be heard.
    Voice cannot be recognized.
    N4-5 - N4-17 (SPD - GND) Navigation operation is available during, or a cursor on present site does not move. Navigation operation is available during, or a cursor on present site does not move.
    N6-4 - N4-17 (MACC - GND) Voice from cellular phone cannot be heard.
    Voice cannot be recognized.    		 Voice from cellular phone cannot be heard.
    Voice cannot be recognized.
    N4-9 - N4-17 (+B - GND) Map screen does not appear. Map screen does not appear.
    N4-10 - N4-17 (AUI- - GND) Driver side speaker does not sound. Driver side speaker does not sound.
    N4-11 (AUO-) Navigation voice does not sound. Navigation voice does not sound.
    N6-5 - B4-17 (MIC- - GND) Voice from cellular phone cannot be heard.
    Voice cannot be recognized.    		 Voice from cellular phone cannot be heard.
    Voice cannot be recognized.
    N4-14 (REV) Moving direction of the vehicle is different from that of the cursor. Moving direction of the vehicle is different from that of the cursor.
    N4-15 - N4-17 (MUT2 - GND) Noise occurs when navigation phrase is changed. Speaker does not sound.
    N4-17 - Body ground (GND - Body ground) Audio system is normal. Audio system is normal.
    N4-18 - N4-17 (ACC - GND) Navigation system does not operate. Fuse is blown.
    N5-1 - N5-6 (VR - VG) Screen noise or other types of noise occur. Screen noise or other types of noise occur.
    N5-2 - N5-6 (R - VG) Screen color turns to blue. Screen color turns to blue.
    N5-3 - N5-6 (B - VG) Screen color turns to yellow. Screen color turns to yellow.
    N5-5 (TX+) Screen is in disorder. Screen is in disorder.
    N5-6 - N4-17 (VG - GND) Screen noise or other types of noise occur. Navigation system does not operate.
    N5-7 - N5-6 (G - VG) Screen color turns to red-purple Screen color turns to red-purple.
    N5-8 - N5-6 (SYNC - VG) Synchronous pulse fluctuates rapidly in map screen. Synchronous pulse fluctuates slowly in map screen.
    N5-10 (TX-)    
  3. RADIO & PLAYER 
    Fig 3: Identifying Radio & Player Connectors & Terminals
    G03150389Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    RADIO & PLAYER CONNECTOR TERMINALS IDENTIFICATION

    Symbols (Terminals No.) Wiring Color Condition STD Voltage (V)
    R3-2 (ATX+) G (*1) See  SERVICE CHECK MODE under PRE-CHECK -
    R3-3 (TXS+) G See  SERVICE CHECK MODE under PRE-CHECK -
    R3-5 (ATX-) R (1) See  SERVICE CHECK MODE under PRE-CHECK -
    R3-6 (TXS-) R See  SERVICE CHECK MODE under PRE-CHECK -
    R2-1 - R2-20 (+B - GND) L-Y - BR Constant 10 - 14 V
    R2-2 - R2-20 (ILL+ - GND) G - BR Light control switch TAIL or HEAD 10 - 14 V
    R2-5 (TX+) G See  SERVICE CHECK MODE under PRE-CHECK -
    R2-7 - R2-20 (MUTE - GND) Y - BR Radio switch ON Below 1 V
    R2-8 - R2-20 (R+ - GND) B - BR Audio system is sounding A waveform synchronized with sound is output
    R2-9 - R2-20 (L+ - GND) R - BR Audio system is sounding A waveform synchronized with sound is output
    R2-10 - Body ground (SGND - Body ground) Shielded - Body ground Constant Below 1 V
    R2-11 - R2-20 (ACC - GND) GR - BR Ignition switch OFF Below 1 V
    Ignition switch ACC or ON 10 - 14 V
    R2-12 - R2-20 (ILL- - GND) W-G - BR Light control switch HI or FLASH. 0 - 5 V
    R2-15 (TX-) R See  SERVICE CHECK MODE under PRE-CHECK -
    R2-18 - R2-20 (R- - GND) W - BR Audio system is sounding A waveform synchronized with sound is output
    R2-19 - R2-20 (L- - GND) G - BR Audio system is sounding A waveform synchronized with sound is output
    R2-20 - Body ground (GND - Body ground) BR - Body ground Constant Below 1 V
    (1) With Lexus Navigation System.
    RADIO & PLAYER CONNECTOR TERMINAL PROBLEM SYMPTOM IDENTIFICATION

    Terminal No. (Symbols) Problem Symptom When Open Circuit Is Detected. Problem Symptom When Short Circuit Is Detected.
    R3-2 (ATX+) Navigation system does not operate. Navigation system does not operate.
    R3-3 (TXS+) Navigation system does not operate. Navigation system does not operate.
    R3-5 (ATX-) Navigation system does not operate. Navigation system does not operate.
    R3-6 (TXS-) Navigation system does not operate. Navigation system does not operate.
    R2-1 - R2-20 (+B - GND) Radio and player does not operate. Fuse is blown.
    R2-2 - R2-20 (ILL+ - GND) Radio and player illumination does not light up. Fuse is blown.
    R2-5 (TX+) Navigation system does not operate. Navigation system does not operate.
    R2-7 - R2-20 (MUTE - GND) Pop sound etc. Speaker does not sound.
    R2-8 - R2-20 (R+ - GND) Sound from right side speaker is small. Sound from right side speaker is small.
    R2-9 - R2-20 (L+ - GND) Sound from left side speaker is small. Sound from left side speaker is small.
    R2-10 - Body ground (SGND - Body ground) Audio system is normal. Audio system is normal.
    R2-11 - R2-20 (ACC - GND) Navigation system does not operate. Fuse is blown.
    R2-12 - R2-20 (ILL- - GND) Light control rheostat does not operate. Light control rheostat does not operate.
    R2-15 (TX-) Navigation system does not operate. Navigation system does not operate.
    R2-18 - R2-20 (R- - GND) Sound from right side speaker is small. Sound from right side speaker is small.
    R2-19 - R2-20 (L- - GND) Sound from left side speaker is small. Sound from left side speaker is small.
    R2-20 - Body ground (GND - Body ground) Navigation system does not operate. Navigation system does not operate.
  4. STEREO COMPONENT AMPLIFIER 
    Fig 4: Identifying Stereo Component Amplifier Connectors & Terminals
    G03150390Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    STEREO COMPONENT AMPLIFIER CONNECTOR TERMINALS IDENTIFICATION

    Symbols (Terminals No.) Wiring Color Condition STD Voltage (V)
    S28-1 - S30-13 (MR+ - GND) B - W-B Audio system is sounding A waveform synchronized with sound is output
    S28-2 - S30-13 (ML+ - GND) R - W-B Audio system is sounding A waveform synchronized with sound is output
    S28-4 - S30-13 (MMUT - GND) Y - W-B Radio switch ON Below 1 V
    S28-6 - S30-13 (MR- - GND) W - W-B Audio system is sounding A waveform synchronized with sound is output
    S28-7 - S30-13 (ML- - GND) G - W-B Audio system is sounding A waveform synchronized with sound is output
    S28-9 (RTX-) LG See  SERVICE CHECK MODE under PRE-CHECK -
    S28-10 (RTX+) L See  SERVICE CHECK MODE under PRE-CHECK -
    S30-1 - S30-13 (FR+ - GND) LG - W-B Audio system is sounding A waveform synchronized with sound is output
    S30-2 - S30-13 (FL+ - GND) P (1) - W-B Audio system is sounding A waveform synchronized with sound is output
    S30-3 - S30-13 (RR+ - GND) W - W-B Audio system is sounding A waveform synchronized with sound is output
    S30-4 - S30-13 (RL+ - GND) B - W-B Audio system is sounding A waveform synchronized with sound is output
    S30-5 - S30-13 (WFR+ - GND) Y - W-B Audio system is sounding A waveform synchronized with sound is output
    S30-6 - S30-13 (WFL+ - GND) LG - W-B Audio system is sounding A waveform synchronized with sound is output
    S30-7 - S30-13 (+B - GND) L-R - W-B Constant 10 - 14 V
    S30-8 - S30-13 (FR- - GND) L - W-B Audio system is sounding A waveform synchronized with sound is output
    S30-9 - S30-13 (FL- - GND) V (1) - W-B Audio system is sounding A waveform synchronized with sound is output
    S30-10 - S30-13 (RR- - GND) R - W-B Audio system is sounding A waveform synchronized with sound is output
    S30-11 - S30-13 (RL- - GND) Y - W-B Audio system is sounding A waveform synchronized with sound is output
    S30-12 - Body ground (E - Body ground) W-B - Body ground Constant Below 1 V
    S30-13 - Body ground (GND - Body ground) W-B - Body ground Constant Below 1 V
    S30-14 - S30-13 (WFR- - GND) B - W-B Audio system is sounding A waveform synchronized with sound is output
    S30-15 - S30-13 (WFL- - GND) L - W-B Audio system is sounding A waveform synchronized with sound is output
    S30-16 - S30-13 (+B2 - GND) L-R - W-B Constant 10 - 14 V
    S29-1 - S30-13 (FR+ - GND) G-W - W-B Audio system is sounding A waveform synchronized with sound is output
    S29-2 - S30-13 (FL+ - GND) V - W-B Audio system is sounding A waveform synchronized with sound is output
    S29-3 - S30-13 (TMUT - GND) LG-R - W-B Cellular mobile telephone is being used Below 1 V
    S29-4 (TX+) L (1) See  SERVICE CHECK MODE under PRE-CHECK -
    S29-5 (MTX+) G (2) See  SERVICE CHECK MODE under PRE-CHECK -
    S29-9 - S30-13 (N-MU - GND) G-R (1) - W-B Navigation voice sounding Below 1 V
    S29-11 - S30-13 (R+ - GND) B - W-B Audio system is sounding A waveform synchronized with sound is output
    S29-12 - S30-13 (L+ - GND) R - W-B Audio system is sounding A waveform synchronized with sound is output
    S29-13 - S30-13 (SPD - GND) V-W - W-B See VEHICLE SIGNAL CHECK MODE in  DISPLAY CHECK MODE under PRE-CHECK -
    S29-14 - S30-13 (FR- - GND) BR - W-B Audio system is sounding A waveform synchronized with sound is output
    S29-15 - S30-13 (FL- - GND) P - W-B Audio system is sounding A waveform synchronized with sound is output
    S29-17 (TX-) LG (1) See  SERVICE CHECK MODE under PRE-CHECK -
    S29-18 (MTX-) R (2) See  SERVICE CHECK MODE under PRE-CHECK -
    S29-20 - S30-13 (ACC - GND) GR - W-B Ignition switch OFF Below 1 V
    Ignition switch ACC or ON 10 - 14 V
    S29-21 - S30-13 (MUTE - GND) Y - W-B Radio switch ON Below 1 V
    S29-23 - S30-13 (R- - GND) W - W-B Audio system is sounding A waveform synchronized with sound is output
    S29-24 - S30-13 (L- - GND) G - W-B Audio system is sounding A waveform synchronized with sound is output
    S29-25 - S30-13 (SPDO - GND) Y-R (1) - W-B See VEHICLE SIGNAL CHECK MODE in  DISPLAY CHECK MODE under PRE-CHECK -
    (1) w/LEXUS Navigation System.
    (2) w/Rear Audio Controller.
    STEREO COMPONENT AMPLIFIER CONNECTOR TERMINAL PROBLEM SYMPTOM IDENTIFICATION

    Terminal No. (Symbols) Problem System When Open Circuit Is Detected. Problem Symptom When Short Circuit Is Detected.
    S28-1 - S30-13 (MR+ - GND) Sound from right side speaker is small. Sound from right side speaker is small.
    S28-2 - S30-13 (ML+ - GND) Sound from left side speaker is small. Sound from left side speaker is small.
    S28-4 - S30-13 (MMUT - GND) Pop sound etc. Pop sound etc.
    S28-6 - S30-13 (MR- - GND) Sound from right side speaker is small. Sound from right side speaker is small.
    S28-7 - S30-13 (ML- - GND) Sound from left side speaker is small. Sound from left side speaker is small.
    S28-9 (RTX-) Navigation system does not operate. Navigation system does not operate.
    S28-10 (RTX+) Navigation system does not operate. Navigation system does not operate.
    S30-1 - S30-13 (FR+ - GND) Front right side speaker does not sound. Front right side speaker does not sound.
    S30-2 - S30-13 (FL+ - GND) Front left side speaker does not sound. Front left side speaker does not sound.
    S30-3 - S30-13 (RR+ - GND) Rear right side speaker does not sound. Rear right side speaker does not sound.
    S30-4 - S30-13 (RL+ - GND) Rear left side speaker does not sound. Rear left side speaker does not sound.
    S30-5 - S30-13 (WFR+ - GND) Woofer does not sound. Woofer does not sound.
    S30-6 - S30-13 (WFL+ - GND) Woofer does not sound. Woofer does not sound.
    S30-7 - S30-13 (+B - GND) If terminal 16 is disconnected, system does not function. Fuse is blown.
    S30-8 - S30-13 (FR- - GND) Front right side speaker does not sound. Front right side speaker does not sound.
    S30-9 - S30-13 (FL- - GND) Front left side speaker does not sound. Front left side speaker does not sound.
    S30-10 - S30-13 (RR- - GND) Rear right side speaker does not sound. Rear right side speaker does not sound.
    S30-11 - S30-13 (RL- - GND) Rear left side speaker does not sound. Rear left side speaker does not sound.
    S30-12 - Body ground (E - Body ground) If terminal 13 is disconnected, system does not function. If terminal 13 is disconnected, system does not function.
    S30-13 - Body ground (GND - Body ground) If terminal 12 is disconnected, system does not function. If terminal 12 is disconnected, system does not function.
    S30-14 - S30-13 (WFR- - GND) Woofer does not sound. Woofer does not sound.
    S30-15 - S30-13 (WFL- - GND) Woofer does not sound. Woofer does not sound.
    S30-16 - S30-13 (+B2 - GND) If terminal 7 is disconnected, system does not function. Fuse is blown.
    S29-1 - S30-13 (FR+ - GND) Right side tweeter speaker does not sound. Right side tweeter speaker is small.
    S29-2 - S30-13 (FL+ - GND) Left side tweeter speaker does not sound. Left side tweeter speaker is small.
    S29-3 - S30-13 (TMUT - GND) Mute cannot be activated during telephone call. Speaker does not sound.
    S29-4 (TX+) Navigation system does not operate. Navigation system does not operate.
    S29-5 (MTX+) Navigation system does not operate. Navigation system does not operate.
    S29-9 - S30-13 (N-MU - GND) Pop sound etc. Speaker does not sound.
    S29-11 - S30-13 (R+ - GND) Sound from right side speaker is small. Sound from right side speaker is small.
    S29-12 - S30-13 (L+ - GND) Sound from left side speaker is small. Sound from left side speaker is small.
    S29-13 - S30-13 (SPD - GND) All switch operation is available during driving. All switch operation is available during driving.
    S29-14 - S30-13 (FR- - GND) Right side tweeter speaker does not sound. Right side tweeter speaker is small.
    S29-15 - S30-13 (FL- - GND) Left side tweeter speaker does not sound. Left side tweeter speaker is small.
    S29-17 (TX-) Navigation system does not operate. Navigation system does not operate.
    S29-18 (MTX-) Navigation system does not operate. Navigation system does not operate.
    S29-20 - S30-13 (ACC - GND) Navigation system does not operate. Fuse is blown.
    S29-21 - S30-13 (MUTE - GND) Pop sound etc. Audio system does not sound.
    S29-23 - S30-13 (R- - GND) Sound from right side speaker is small. Sound from right side speaker is small.
    S29-24 - S30-13 (L- - GND) Sound from left side speaker is small. Sound from left side speaker is small.
    S29-25 - S30-13 (SPDO - GND) All switch operation is available during driving. Navigation operation is available during, or a cursor on present site does not move.
  5. STEREO COMPONENT TUNER 
    Fig 5: Identifying Stereo Component Tuner Connectors & Terminals
    G03150391Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    STEREO COMPONENT TUNER CONNECTOR TERMINALS IDENTIFICATION

    Symbols (Terminals No.) Wiring Color Condition STD Voltage (V)
    S31-1 - S31-25 (B - GND) L-Y - W-B Constant 10 - 14 V
    S31-2 - S31-25 (SG - GND) Shielded - W-B Constant Below 1 V
    S31-3 - S31-25 (R+ - GND) B - W-B Audio system is sounding A waveform synchronized with sound is output
    S31-4 - S31-25 (L+ - GND) R - W-B Audio system is sounding A waveform synchronized with sound is output
    S31-8 (ATX+) L See  SERVICE CHECK MODE under PRE-CHECK -
    S31-9 (TXS+) G See  SERVICE CHECK MODE under PRE-CHECK -
    S31-11 - S31-25 (MUTE - GND) Y - W-B Radio switch ON Below 1 V
    S31-14 - S31-25 (ACC GND) GR - W-B Ignition switch OFF Below 1 V
    Ignition switch ACC or OFF 10 - 14 V
    S31-16 - S31-25 (R- - GND) W - W-B Audio system is sounding A waveform synchronized with sound is output
    S31-17 - S31-25 (L- - GND) G - W-B Audio system is sounding A waveform synchronized with sound is output
    S31-20 (ATX-) LG See  SERVICE CHECK MODE under PRE-CHECK -
    S31-21 (TXS-) R See  SERVICE CHECK MODE under PRE-CHECK -
    S31-25 - Body ground (GND - Body ground) W-B - Body ground Constant Below 1 V
    STEREO COMPONENT TUNER CONNECTOR TERMINAL PROBLEM SYMPTOM IDENTIFICATION

    Terminal No. (Symbols) Problem Symptom When Open Circuit Is Detected. Problem Symptom When Short Circuit Is Detected.
    S31-1 - S31-25 (B - GND) Navigation system does not operate. Fuse is blown.
    S31-2 - S31-25 (SG - GND) Audio system is normal. Audio system is normal.
    S31-3 - S31-25 (R+ - GND) Sound from right side speaker is small. Sound from right side speaker is small.
    S31-4 - S31-25 (L+ - GND) Sound from left side speaker is small. Sound from left side speaker is small.
    S31-8 (ATX+) Navigation system does not operate. Navigation system does not operate.
    S31-9 (TXS+) Navigation system does not operate. Navigation system does not operate.
    S31-11 - S31-25 (MUTE - GND) Pop sound, etc. Speaker does not sound.
    S31-14 - S31-25 (ACC - GND) Navigation system does not operate. Fuse is blown.
    S31-16 - S31-25 (R- - GND) Sound from right side speaker is small. Sound from right side speaker is small.
    S31-17 - S31-25 (L- - GND) Sound from left side speaker is small. Sound from left side speaker is small.
    S31-20 (ATX-) Navigation system does not operate. Navigation system does not operate.
    S31-21 (TXS-) Navigation system does not operate. Navigation system does not operate.
    S31-25 - Body ground (GND - Body ground) Navigation system does not operate. -
  6. AUDIO & REAR A/C CONTROL SWITCH 
    Fig 6: Identifying Audio & Rear A/C Control Switch Connector & Terminals
    G03150392Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    AUDIO & REAR A/C CONTROL SWITCH CONNECTOR TERMINALS IDENTIFICATION

    Symbols (Terminals No.) Wiring Color Condition STD Voltage (V)
    A35-5 (1) - A35-10 (+B - GND) L-W - W-B Constant 10 - 14 V
    A35-1 (1), (TX+) G See  SERVICE CHECK MODE under PRE-CHECK -
    A35-10 (1) - Body ground (GND - Body ground) W-B - Body ground Constant Below 1 V
    A35-9 (1) - A35-10 (ACC+ - GND) GR - W-B Ignition switch OFF Below 1 V
    Ignition switch ACC or ON 10 - 14 V
    A35-13 (2) - A35-8 (1) (LP+ - GND) G - W-B Light control switch OFF Below 1 V
    Light control switch TAIL or HEAD 10 - 14 V
    A35-7 (2) - A35-8 (1) (ILL- - GND) W-B - W-B Rear center arm-rest is opening (rear center arm-rest courtesy switch ON) Below 1 V
    A35-6(1), (TX-) R See  SERVICE CHECK MODE under PRE-CHECK -
    (1) W/Rear Power Seat.
    (2) W/O Rear Power Seat.
    AUDIO & REAR A/C CONTROL SWITCH CONNECTOR TERMINAL PROBLEM SYMPTOM IDENTIFICATION

    Terminal No. (Symbols) Problem Symptom When Open Circuit Is Detected. Problem Symptom When Short Circuit Is Detected.
    A35-5 (1) - A35-10 (+B - GND) Navigation system does not operate. Fuse is blown.
    A35-1 (1), (TX+) Navigation system does not operate. Navigation system does not operate.
    A35-10 (1) - Body ground (GND - Body ground) Navigation system does not operate.  
    A35-9 (1) - A35-10 (ACC - GND) Navigation system does not operate. Fuse is blown.
    A35-13 (2) - A35-8 (1) (LP+ - GND) Audio and rear A/C control switch illumination does not light up. Audio and rear A/C control switch illumination does not light up.
    A35-7 (2) - A35-8 (1) (ILL- - GND) Audio and rear A/C control does not displayed. Audio and rear A/C control display is normal.
    A35-6 (1), (TX-) Navigation system does not operate. Navigation system does not operate.
    (1) W/Rear Power Seat.
    (2) W/O Rear Power Seat.
  7. TELEPHONE TRANSCEIVER & SPEAKER RELAY 
    Fig 7: Identifying Telephone Transceiver & Speaker Relay Connectors & Terminals
    G03150393Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TELEPHONE TRANSCEIVER & SPEAKER RELAY CONNECTOR TERMINALS IDENTIFICATION

    Terminals No Symbols Condition STD Voltage (V)
    AA1 - AA24 SPI+ - GND Audio system is sounding A waveform synchronized with sounds is output
    AA2 - AA24 SPO+ - GND Audio system is sounding A waveform synchronized with sounds is output
    AA3 - AA24 TLSW - GND Steering pad switch is not operating 5 V
    "3" switch is pushed 3.8 V
    "2" switch is pushed 2.5 V
    "1" switch is pushed 1.2 V
    "TEL" switch is pushed 0 V
    AA4 - AA24 TELI - GND Ignition switch ACC Below 1 V
    AA5 - AA24 MACC - GND Ignition switch ACC 5 V
    AA6 - AA24 MICN - GND Ignition switch ACC 5 V
    AA7 TX+ See  SERVICE CHECK MODE under PRE-CHECK -
    AA8 - AA21 SYNC - VG Cellular phone display is displayed Pulse generation (See Oscilloscope Waveform No. 1  under PULSE GENERATION)
    AA9 - AA21 R - VG Cellular phone display is displayed Pulse generation (See Oscilloscope Waveform No. 2  under PULSE GENERATION)
    AA10 - AA21 VR - VG Ignition switch OFF or ACC Below 1 V
    AA12 AA24 IG GND1 Ignition switch OFF or ACC Below 1 V
    Ignition switch ON 10 - 14 V
    AA13 - AA24 +B - GND Constant 10 - 14 V
    AA14 - AA24 SPI- - GND Audio system is sounding A waveform synchronized with sounds is output
    AA15 - AA24 SPO- - GND During voice guidance of cellular phone A waveform synchronized with sounds is output
    AA16 - AA24 SW- - GND Ignition switch OFF Below 1 V
    AA17 - AA24 CNRL - GND LEXUS link system is operating Below 1 V
    AA18 - AA24 MUTE - GND While communicating over cellular phone Below 1 V
    AA19 - Body ground MIGND - Body ground Constant Below 1 V
    AA20 TX- See  SERVICE CHECK MODE under PRE-CHECK -
    AA21 - AA24 VG - GND Ignition switch OFF Below 1 V
    AA22 - AA21 G - VG Cellular phone display is displayed Pulse generation (See Oscilloscope Waveform No. 2  under PULSE GENERATION)
    AA23 - AA21 B - VG Cellular phone display is displayed Pulse generation (See Oscilloscope Waveform No. 2  under PULSE GENERATION)
    AA24 - Body ground GND1 - Body ground Constant Below 1 V
    AA25 - AA24 ACC - GND Ignition switch OFF Below 1 V
    BB1 TX1+ See  SERVICE CHECK MODE under PRE-CHECK -
    BB5 - BB16 R1 - VG1 Navigation map display is displayed Pulse generation (See Oscilloscope Waveform No. 2  under PULSE GENERATION)
    BB6 - BB16 G1 - VG1 Navigation map display is displayed Pulse generation (See Oscilloscope Waveform No. 2  under PULSE GENERATION)
    BB7 - BB16 B1 - VG1 Navigation map display is displayed Pulse generation (See Oscilloscope Waveform No. 2  under PULSE GENERATION)
    BB8 - BB16 VR1 - VG1 Ignition switch OFF Below 1 V
    BB9 TX1- See  SERVICE CHECK MODE under PRE-CHECK -
    B15 - BB16 SYNC1 - VG1 Navigation map display is displayed Pulse generation (See Oscilloscope Waveform No. 1  under PULSE GENERATION)
    BB16 - AA24 VG1 - GND Ignition switch OFF Below 1 V
    CC1 - AA24 PCMCLK - GND While communicating over cellular phone Pulse generation (3 V)
    CC2 - AA24 PCMRA - GND While communicating over cellular phone Pulse generation (3 V)
    CC3 - AA24 ASYNCTXD - GND Cellular phone display is displayed Pulse generation (3 V)
    CC4 - AA24 ASYNCRXD - GND Cellular phone display is displayed Pulse generation (3 V)
    CC5 - AA24 CALL - GND While communicating over cellular phone Below 1 V
    CC6 - AA24 PCMSYNC - GND While communicating over cellular phone Pulse generation (3 V)
    CC10 - AA24 VBATX - GND Cellular phone display is displayed 2 V or more
    CC11 - AA24 VCHG - GND Ignition switch OFF Below 1 V
    CC12 - Body ground GND - Body ground Constant Below 1 V
    CC13 - Body ground GND - Body ground Constant Below 1 V
    CC14 - Body ground GND - Body ground Constant Below 1 V
    CC18 - AA24 PCMTA - GND While communicating over cellular phone Pulse generation (3 V)
    CC19 - AA24 S- - GND Cellular phone display is displayed Pulse generation (See Oscilloscope Waveform No. 2  under PULSE GENERATION)
    CC20 - AA24 IDVAL - GND Ignition switch OFF 18.2 kΩ
    CC21 - AA24 S+ - GND Cellular phone display is displayed 5 V
    TELEPHONE TRANSCEIVER & SPEAKER RELAY CONNECTOR TERMINAL PROBLEM SYMPTOM IDENTIFICATION

    Terminal No. (Symbols) Problem Symptom When Open Circuit Is Detected. Problem Symptom When Short Circuit Is Detected.
    AA1 - AA24 (SPI+ - GND) Sound from rear left side speaker is small. Sound from rear left side speaker is small.
    AA2 - AA24 (SPO+ - GND) Sound from rear left side speaker is small. Sound from rear left side speaker is small.
    AA3 - AA24 (TLSW - GND) Steering pad switch can not operate. Steering pad switch can not operate.
    AA4 - AA24 (TELI - GND) Even when voice is recognized or registered, air conditioner blower is on. Air conditioning blower is constantly operating.
    AA5 - AA24 (MACC - GND) No voice can be heard from cellular phone and voice recognition cannot be done. No voice can be heard from cellular phone and voice recognition cannot be done.
    AA6 - AA24 (MICIN - GND) No voice can be heard from cellular phone and voice recognition cannot be done. No voice can be heard from cellular phone and voice recognition cannot be done.
    AA7 (TX+) Cellular phone screen is disorder and navigation system does not operate. Cellular phone screen is disorder and navigation system does not operate.
    AA8 - AA21 (SYNC - VG) Synchronous pulse fluctuates rapidly in map screen. Synchronous pulse fluctuates rapidly in map screen.
    AA9 - AA21 (R - VG) Screen color turns to blue. Screen color turns to blue.
    AA10 - AA21 (VR - VG) Navigation system is normal. Navigation system is normal.
    AA12 - AA24 (IG - GND1) Navigation operation is available during, or a cursor on present site does not move. Navigation operation is available during, or a cursor on present site does not move.
    AA13 - AA24 (+B - GND) Cellular phone does not operate. Fuse is blown.
    AA14 - AA24 (SPI- - GND) Sound from rear left side speaker is small. Sound from rear left side speaker is small.
    AA15 - AA24 (SPO- - GND) Sound from rear left side speaker is small. Sound from rear left side speaker is small.
    AA16 - AA24 (SW - GND) Steering pad switch illumination does not light up and switch can not be operation. Steering pad switch illumination does not light up and switch can not be operation.
    AA17 - AA24 (CNRL - GND) Activation of LEXUS link system cannot be detected. Activation of LEXUS link system cannot be detected.
    AA18 - AA24 (MUTE - GND) Audio system sounds during communication over cellular phone. Audio system does not sound.
    AA19 - Body ground (MIGND - Body ground) No voice can be heard from cellular phone and voice recognition cannot be done. No voice can be heard from cellular phone and voice recognition cannot be done.
    AA20 (TX-) Cellular phone screen is disorder and navigation system does not operate. Cellular phone screen is disorder and navigation system does not operate.
    AA21 - AA24 (VG - GND) Navigation system is normal. Navigation system is normal.
    AA22 - AA21 (G - VG) Screen color turns to red-purple. Screen color turns to red-purple.
    AA23 - AA21 (B - VG) Screen color turns to yellow. Screen color turns to yellow.
    AA24 - Body ground (GND1 - Body ground) Cellular phone does not operate or operates abnormally. (Noise occurs during communication over cellular phone, noise appears on cellular phone screen, etc.) Cellular phone does not operate or operates abnormally. (Noise occurs during communication over cellular phone, noise appears on cellular phone screen, etc.)
    AA25 - AA24 (ACC - GND) Cellular phone does not operate. Cellular phone does not operate.
    BB1 (TX1+) Cellular phone screen is disorder and navigation system does not operate. Cellular phone screen is disorder and navigation system does not operate.
    BB5 - BB16 (R1 - VG1) Screen color turns to red-purple. Screen color turns to red-purple.
    BB6 - BB16 (G1 - VG1) Screen color turns to red-purple. Screen color turns to red-purple.
    BB7 - BB16 (B1 - VG1) Screen color turns to yellow. Screen color turns to yellow.
    BB8 - BB16 (VR1 - VG1) Navigation system is normal. Navigation system is normal.
    BB9 (TX1-) Cellular phone screen is disorder and navigation system does not operate. Cellular phone screen is disorder and navigation system does not operate.
    B15 - BB16 (SYNC1 - VG1) Synchronous pulse fluctuates rapidly in map screen. Synchronous pulse fluctuates slowly in map screen.
    BB16 - AA24 (VG1 - GND) Navigation system is normal. Navigation system is normal.
    CC1 - AA24 (PCMCLK - GND) No voice can be heard from cellular phone. No voice can be heard from cellular phone.
    CC2 - AA24 (PCMRA - GND) No voice can be heard from cellular phone. No voice can be heard from cellular phone.
    CC3 - AA24 (ASYNCTXD - GND) Communication between cellular phone and telephone transceiver & speaker relay is impossible. Communication between cellular phone and telephone transceiver & speaker relay is impossible.
    CC4 - AA24 (ASYNCRXD - GND) Communication between cellular phone and telephone transceiver & speaker relay is impossible. Communication between cellular phone and telephone transceiver & speaker relay is impossible.
    CC5 - AA24 (CALL - GN) Cellular phone does not operate. Cellular phone does not operate.
    CC6 - AA24 (PCMSYNC - GND) Cellular phone does not operate. Cellular phone does not operate.
    CC10 - AA24 (VBATX - GND) Connection of cellular phone cannot be detected. Connection of cellular phone cannot be detected.
    CC11 - AA24 (VCHG - GND) Recharge and power supply to cellular phone cannot be done. Recharge and power supply to cellular phone cannot be done.
    CC12 - Body ground (GND - Body ground) Noise occurs during communication over cellular phone. Noise occurs during communication over cellular phone.
    CC13 - Body ground (GND - Body ground) Noise occurs during communication over cellular phone. Noise occurs during communication over cellular phone.
    CC14 - Body ground (GND - Body ground) Noise occurs during communication over cellular phone. Noise occurs during communication over cellular phone.
    CC18 - AA24 (PCMTA - GND) No voice can be heard from cellular phone. No voice can be heard from cellular phone.
    CC19 - AA24 (S- - GND) Recharge and power supply to cellular phone cannot be done. Recharge and power supply to cellular phone cannot be done.
    CC20 - AA24 (IDVAL - GND) Connection of cellular phone cannot be detected. Connection of cellular phone cannot be detected.
    CC21 - AA24 (S+ - GND) Recharge and power supply to cellular phone cannot be done. Recharge and power supply to cellular phone cannot be done.
  8. CELLULAR MOBILE TELEPHONE SYSTEM WIRING DIAGRAM 
    Fig 8: Cellular Mobile Telephone System Wiring Schematic
    G03150394Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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