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Terminals Of Ecu

WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
  1. RADIO AND PLAYER 
    Fig 1: Identifying Terminals Of ECU
    G03376611Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    VOLTAGE SPECIFICATION

    Symbols (Terminals No.) Wiring Color Condition STD Voltage (V)
    R3-2 (ATX+) G((1)) See "Service Check Mode" -
    R3-3 (TXS+) G See "Service Check Mode" -
    R3-5 (ATX-) R((1)). See "Service Check Mode" -
    R3-6 (TXS-) R See "Service Check Mode" -
    R2-1 - R2-20 (+B-GND) L-Y - BR Constant 10 - 14 V
    R3-2 - R2-20 (ATX+ - GND) ((1)) G - BR Light control switch TAIL or HEAD 10 - 14 V
    R2-5 (TX+) G See "Service Check Mode" -
    R2-7 - R2-20 (MUTE - GND) Y - BR Switching CD player <=> Cassette player Below 3.5 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 Headlight switch ON, Automatic light sensor ON and Tail cancel switch OFF simultaneously 10 - 14 V
    R2-15 (TX-) R See "Service Check Mode" -
    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
    R2-10 - Body ground (SGND - Body ground) Shielded - Body ground Constant Below 1 V
    (1) w/ LEXUS Navigation System
    TERMINAL SPECIFICATION

    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. System does not operate.
    R3-3 (TXS+) Steering pad switch does not operate. System does not operate.
    R3-5 (ATX-) Navigation system does not operate. System does not operate.
    R3-6 (TXS-) Steering pad switch does not operate. System does not operate.
    R2-1 - R2-20 (+B - GND) Radio and player does not operate. Fuse is blown.
    R3-2 - R2-20 (ATX+ - GND) Radio and player illumination does not light up. Fuse is blown.
    R2-5 (TX+) Navigation system does not operate. 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) Radio and player illumination does not light up. Light control rheostat does not operate.
    R2-15 (TX-) Navigation system does not operate. 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) System does not operate. Audio system is normal.
  2. STEREO COMPONENT AMPLIFIER 
    Fig 2: Identifying Stereo Component Amplifier Terminal
    G03376612Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    VOLTAGE SPECIFICATION

    Symbols (Terminals No.) Wiring Color Condition STD Voltage (V)
    S28-1 - S30-13 (MR+ - GND) B - W-B Audio system is sounding (Radio) A waveform synchronized with sound is output
    S28-2 - S30-13 (ML+ - GND) R - W-B Audio system is sounding (Radio) A waveform synchronized with sound is output
    S28-4 - S30-13 (MMUT - GND) Y - W-B Radio switch ON Below 3.5 V
    S28-6 - S30-13 (MR--GND) W - W-B Audio system is sounding (Radio) A waveform synchronized with sound is output
    S28-7 - S30-13 (ML--GND) G - W-B Audio system is sounding (Radio) A waveform synchronized with sound is output
    S28-9 (RTX-) LG See "Service Check Mode" -
    S28-10 (RTX+) L See "Service Check Mode" -
    S30-1 - S30-13 (FR+ - GND) G-W - W-B Audio system is sounding A waveform synchronized with sound is output
    S30-2 - S30-13 (FL+ - GND) V - 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) P((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
    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) V - W-B Audio system is sounding A waveform synchronized with sound is output
    S30-3 - S30-13 (TMUT - GND) LG-R - W-B Cellular mobile telephone is being used Below 3.5 V
    S29-4 (TX+) L((1)) See "Service Check Mode" -
    S29-5 (MTX+) G((2)) See "Service Check Mode" -
    S29-9 - S30-13 (N-MU - GND) G-R ((1)) - W-B Navigation voice sounding Below 3.5 V
    S29-11 - S30-13 (R+ - GND) B - W-B CD player or cassette player is sounding A waveform synchronized with sound is output
    S29-12 - S30-13 (L+ - GND) R - W-B CD player or cassette player is sounding A waveform synchronized with sound is output
    S29-13 - S30-13 (SPD - GND) V-W - W-B See "Vehicle Signal Check Mode" -
    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" -
    S29-18 (MTX-) R((2)) See "Service Check Mode" -
    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 Switching CD player o Cassette player Below 3.5 V
    S29-23 - S30-13 (R--GND) W - W-B CD player or cassette player is sounding A waveform synchronized with sound is output
    S29-24 - S30-13 (L--GND) G - W-B CD player or cassette player 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" -
    (1) w/ LEXUS Navigation System
    (2) w/ Rear Audio Controller
    TERMINAL SPECIFICATION

    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. Speaker does not sound.
    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.
    S29-1 - S30-13 (FR+ - GND) Front right side speaker does not sound. *5: Front right side speaker does not sound.
    *6: All speakers does not sound.
    S29-2 - S30-13 (FL+ - GND) Front left side speaker does not sound. *5: Front left side speaker does not sound.
    *6: All speakers does not sound.
    S30-3 - S30-13 (RR+ - GND) Rear right side speaker does not sound. *5: Rear right side speaker does not sound.
    *6: All speakers does not sound.
    S30-4 - S30-13 (RL+ - GND) Rear left side speaker does not sound. *5: Rear left side speaker does not sound.
    *6: All speakers does not sound.
    S30-5 - S30-13 (WFR+ - GND) *5: Woofer does not sound.
    *6: Sound from woofer is small.    		 *5, *6: Woofer does not sound.
    S30-6 - S30-13 (WFL+ - GND) *5: Woofer does not sound.
    *6: Sound from woofer is small.    		 *5, *6: 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. *5: Audio system is normal.
    *6: All speakers does not sound.
    S29-15 - S30-13 (FL--GND) Front left side speaker does not sound. *5: Front left side speaker is normal.
    *6: All speakers does not sound.
    S30-10 - S30-13 (RR--GND) Rear right side speaker does not sound. *5: Rear right side speaker is normal.
    *6: All speakers does not sound.
    S30-11 - S30-13 (RL--GND) Rear left side speaker does not sound. *5: Rear left side speaker is normal.
    *6: All speakers does not sound.
    S30-13 - Body ground (GND - Body ground) If terminal 13 is disconnected, system does not function. Audio system is normal.
    S30-13 - Body ground (GND - Body ground) If terminal 12 is disconnected, system does not function. Audio system is normal.
    S29-14 - S30-13 (WFR--GND) *5:-
    *6: Sound from woofer is small.    		 *5:-
    *6: All speakers does not sound.
    S29-15 - S30-13 (WFL--GND) *5:-
    *6: Sound from woofer is small.    		 *5:-
    *6: All speakers does not sound.
    S29-16 - S30-13 (+B2 - GND) If terminal 7 is disconnected, system does not function. Fuse is blown.
    S30-1 - S30-13 (FR+ - GND) Right side tweeter speaker does not sound. *5: Right side tweeter speaker does not sound.
    *6: All speakers does not sound.
    S29-2 - S30-13 (FL+ - GND) Left side tweeter speaker does not sound. *5: Left side tweeter speaker does not sound.
    *6: All speakers does not sound.
    S29-3 - S30-13 (TMUT - GND) Mute cannot be activated during telephone call. All speakers does not sound.
    S29-4 (TX+) Navigation system does not operate. System does not operate.
    S29-5 (MTX+) Audio rear A/C control switch does not operate. System does not operate.
    S29-9 - S30-13 (N-MU - GND) Pop sound etc. Front right 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) Navigation operation is available during, or a cursor on present site does not move. (ASL does not operate) Navigation operation is available during, or a cursor on present site does not move. (ASL does not operate)
    S30-14 - S30-13 (FR--GND) Right side tweeter speaker does not sound. *5: Audio system is normal.
    *6: All speakers do not sound.
    S30-15 - S30-13 (FL--GND) Left side tweeter speaker does not sound. *5: Audio system is normal.
    *6: All speakers do not sound.
    S29-17 (TX-) Navigation system does not operate. System does not operate.
    S29-18 (MTX-) Does not operate. System does not operate.
    S29-20 - S30-13 (ACC - GND) Audio & rear A/C control switch does not sound. 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) Navigation operation is available during, or a cursor on present site does not move. (ASL does not operate) Navigation operation is available during, or a cursor on present site does not move. (ASL does not operate)
  3. STEREO COMPONENT TUNER 
    Fig 3: Identifying Stereo Component Tuner Terminal
    G03376613Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    VOLTAGE SPECIFICATION

    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) -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" -
    S31-9 (TXS+) G See "Service check Mode" -
    S31-11 - S31-25 (MUTE - GND) Y - W-B Switching AM switch °FM switch Below 3.5 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" -
    S31-21 (TXS-) R See "Service check Mode" -
    S31-25 - Body ground (GND - Body ground) W-B - Body ground Constant Below 1 V
    TERMINAL SPECIFICATION

    Terminal No. (symbols) Problem symptom when open circuit is detected. Problem symptom when short circuit is detected.
    S31-1 - S31-25 (B - GND) Stereo component tuner 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. System does not operate.
    S31-9 (TXS+) Navigation system does not operate. System does not operate.
    S31-11 - S31-25 (MUTE - GND) Pop sound ETC. Does not sound.
    S31-14 - S31-25 (ACC - GND) Stereo component tuner 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. System does not operate.
    S31-21 (TXS-) Navigation system does not operate. System does not operate.
    S31-25 - Body ground (GND - Body ground) Stereo component tuner does not operate. Audio system is normal.
  4. AUDIO AND REAR A/C CONTROL SWITCH 
    Fig 4: Identifying Audio And Rear A/C Control Switch Terminal
    G03376614Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    VOLTAGE SPECIFICATION

    Symbols (Terminals No.) Wiring Color Condition STD Voltage (V)
    A35-1 - A35-10 (TX+ - GND) G((1)) - W-B ((1)) Constant 10 - 14 V
    A35-1 (TX+) G ((1)) See "Service Check Mode" -
    A35-10 - Body ground (GND - Body ground) W-B ((1)) - Body ground Constant Below 1 V
    A35-9 - A35-10 (ACC - GND) GR - W-B ((1)) Ignition switch OFF Below 1 V
    Ignition switch ACC or ON 10 - 14 V
    A35-6 - A35-10 (TX--GND) R ((1)) - W-B ((1)) Light control switch OFF Below 1 V
    Light control switch TAIL or HEAD 10 - 14 V
    A35-7 - A35-10 (ILL--GND) W-B ((2)) - W-B ((1))
    Rear center arm-rest is closing.
    (rear center arm-rest courtesy switch ON)    		 Below 3 V
    A35-6 (TX-) R ((1)) See "Service Check Mode" -
    (1) w/ Rear Audio Controller
    (2) w/o Rear Power Seat
    TERMINAL SPECIFICATION

    Terminal No. (Symbols) Problem symptom when open circuit is detected. Problem symptom when short circuit is detected.
    A35-1 - A35-10 (TX+ - GND) Audio and rear A/C control switch does not operate. Fuse is blown.
    A35-1 (TX+) Audio and rear A/C control switch does not operate. System does not operate.
    Audio and rear A/C control switch does not operate. Audio and rear A/C control switch does not operate. -
    A35-9 - A35-10 (ACC - GND) Audio and rear A/C control switch does not operate. Fuse is blown.
    A35-6 - A35-10 (TX--GND) Rear seat control switch illumination does not light up. Rear seat control switch illumination does not light up.
    A35-7 - A35-10 (ILL--GND) Audio and rear A/C control does not displayed. Audio and rear A/C control switch illumination does not light up.
    A35 - 6 (TX-) Audio and rear control switch does not operate. System does not operate.
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