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Home >> Lexus >> 2007 >> LX 470 >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Air Conditioning >> Air Conditioning System >> Terminals Of Ecu

Terminals Of Ecu

  1. CHECK FRONT AIR CONDITIONING AMPLIFIER 
    Fig 1: Identifying Front Air Conditioning Amplifier ECU Terminals
    G05284107Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TERMINALS REFERENCE

    Symbols (Terminal No.) Wiring Color Condition Specified Condition
    AIF (A47-1) - GND (A49-12) G-W - W-B IG ON. Air inlet control switch "FRESH" Battery voltage
    IG ON. Air inlet control switch "RECIRC" Below 1.0 V
    AIR (A47-2) - GND (A49-12) LG-B - W-B IG ON. Air inlet control switch "RECIRC" Battery voltage
    IG ON. Air inlet control switch "FRESH" Below 1.0 V
    MRRHR (A47-6) - GND (A49-12) R - W-B IG ON. Mirror heater switch "OFF" Battery voltage
    IG ON. Mirror heater switch "ON" Below 1.0 V
    MGC (A47-7) - GND (A49-12) L - W-B Compressor does not operate Battery voltage
    Compressor operates Below 1.0 V
    FRHR (A47-9) - GND (A49-12) Y-R - W-B IG ON. Front A/C blower motor does not operate Battery voltage
    IG ON. Front A/C blower motor operates Below 1.0 V
    RDFGR (A47-10) - GND (A49-12) LG - W-B IG ON. Rear defogger switch "OFF" Battery voltage
    IG ON. Rear defogger switch "ON" Below 1.0 V
    AC1 (A47-11) - GND (A49-12) W-G - W-B Compressor does not operate Battery voltage
    Compressor operates Below 1.0 V
    DEF (A47-12) - GND (A49-12) B-W - W-B IG ON. Mode control switch "Except DEF" Battery voltage
    IG ON. Mode control switch "DEF" Below 0.7 V
    F/D (A47-13) - GND (A49-12) P-L - W-B IG ON. Mode control switch "Except FOOT/DEF" Battery voltage
    IG ON. Mode control switch "FOOT/DEF" Below 0.7 V
    FOOT (A47-14) - GND (A49-12) W - W-B IG ON. Mode control switch "Except FOOT/DEF" Battery voltage
    IG ON. Mode control switch "FOOT/DEF" Below 0.7 V
    B/L (A47-15) - GND (A49-12) BR-W - W-B IG ON. Mode control switch "Except BI-LEVEL" Battery voltage
    IG ON. Mode control switch "BI-LEVEL" Below 0.7 V
    FACE (A47-16) - GND (A49-12) GR - W-B IG ON. Mode control switch "Except FACE" Battery voltage
    IG ON. Mode control switch "FACE" Below 0.7 V
    FRAMH (A47-21) - GND (A49-12) P-B - W-B IG ON. Temperature control dial "MAX. WARM" Battery voltage
    IG ON. Temperature control dial "MAX. COOL" Below 1.0 V
    FRAMC (A47-22) - GND (A49-12) P-G - W-B IG ON. Temperature control dial "MAX. COOL" Battery voltage
    IG ON. Temperature control dial "MAX. WARM" Below 1.0 V
    FRBLW (A47-23) - GND (A49-12) W-R - W-B IG ON. Front A/C blower motor does not operate Battery voltage
    IG ON. Front A/C blower motor operates Pulse generation
    HZD (A47-24) * - GND (A49-12) W - W-B Hazard switch "ON" Continuity
    DEFC (A47-27) * - GND (A49-12) R-L - W-B Diff. lock switch "ON." Continuity
    ANTU (A47-28) * - GND (A49-12) L-Y - W-B Push in antenna up switch Continuity
    ANTD (A47-29) * - GND (A49-12) L-W - W-B Push in antenna down switch Continuity
    RRMGV (A47-40) - GND (A49-12) LG-R - W-B IG ON. Rear cooler switch "OFF" Battery voltage
    IG ON. Rear cooler switch "ON" Below 1.0 V
    FRTP (A48-5) - FRSG (A48-18) B-Y - Y-G IG ON. Temperature control dial "MAX. COOL" Approx. 4.0 V
    IG ON. Temperature control dial "MAX. WARM" Approx. 1.0 V
    TAM (A48-7) - FRSG (A48-18) L-Y - Y-G IG ON. Ambient temperature at 25°C (77°F) 1.35 to 1.75 V
    TS (A48-8) - FRSG (A48-18) B-Y - Y-G IG ON. Sensor subject electric light 0.8 to 4.3 V
    IG ON. Sensor covered by a cloth Below 0.8 V
    FRS5 (A48-9) - FRSG (A48-18) G-R - Y-G Turn ignition switch "ON" 5.0 V
    Turn ignition switch "OFF" No voltage
    TPI (A48-14) - FRSG (A48-18) L-R - Y-G IG ON. Air inlet control switch "FRESH" Approx. 1.0 V
    IG ON. Air inlet control switch "RECIRC" Approx. 4.0 V
    FRTE (A48-16) - FRSG (A48-18) GR-B - Y-G IG ON. Evaporator temperature at 15°C (59°F) 1.4 to 1.8 V
    FRTR (A48-17) - FRSG (A48-18) B-Y-G IG ON. Cabin temperature at 25°C (77°F) 1.8 to 2.2 V
    FRSG (A48-18) - Body ground Y-G - Body ground Always Continuity
    ACT (A49-4) - GND (A49-12) L-B - W-B Compressor operates Below 1.0 V
    Compressor does not operate No voltage
    TW (A49-5) - GND (A49-12) Y-B - W-B IGON. Pulse generation
    SPD (A49-6) - GND (A49-12) V - W-B Turn propeller shaft slowly Pulse generation
    PSW (A49-8) - GND (A49-12) L-W - W-B A/C refrigerant pressure: less than 0.9 MPa (2.0 kgf/cm2 ) or more than 3.14 MPa (32 kgf/cm2 , 455.1 psi) From 10 to 14 V to below 1.0 V
    +B (A49-11) - GND (A49-12) L-W - W-B Always Battery voltage
    GND (A49-12) - Body ground W-B - Body ground Always Continuity
    VER4 (A49-15) * - GND (A49-12) W-B - W-B Always Continuity
    VER2 (A49-17) - GND (A49-12) W-B - W-B Always Continuity
    VER1 (A49-18) - Body ground W-B - Body ground Always Continuity
    IG (A49-22) - GND (A49-12) R-L- W-B IG ON. Light control switch "ON" Battery voltage
    IG ON. Light control switch "OFF" No voltage
    HINT:
    *: w/o Navigation system
  2. CHECK REAR AIR CONDITIONING AMPLIFIER 
    Fig 2: Identifying Rear Air Conditioning Amplifier Connectors Terminals
    G05284108Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TERMINALS REFERENCE

    Symbols (Terminal No.) Wiring Color Condition Specified Condition
    +B (A33-1) - GND (A33-22) L-W - W-B Always Battery voltage
    IG (A33-2) - GND (A33-22) B-W - W-B IG ON. Battery voltage
    VMC (A33-3) - GND (A33-22) W-L - W-B Rr FACE mode. Rr blower switch: LO → MIDDLE → HI 7.2 → 4.2 → 0.5 V
    BLWC (A33-4) - GND (A33-22) R- W-B Rr FACE mode. Rr blower switch: OFF → LO Below 1.0 V → 1.5 to 3.0 V
    S5 (A33-5) - SG (A33-9) R-Y - Y-G IGON. 4.5 to 5.5 V
    TPH (A33-6) - SG(A33-9) GR-R - Y-G Rr temp. control switch: Max. COOL → Max. HOT 4.0 to 1.0 V
    TEC (A33-7) - SG (A33-9) Y-Y-G Rr evaporator temp.: 0°C (32°F) 2.0 to 2.4 V
    Rr evaporator temp.: 15°C (59°F) 2.0 to 2.4 V
    TINH (A33-8) - SG(A33-9) GR-G - Y-G Rr inlet air temp.: 25°C (77°F) 1.5 to 1.9 V
    Rr inlet air temp.: 40°C (104°F) 1.2 to 1.6 V
    SG (A33-9) - GND (A33-22) Y-G - W-B Always Continuity
    MCH (A33-11) - GND (A33-22) W-L - W-B Rr temp. control switch: Max. HOT → Max. COOL Below 1.0 V → Battery voltage for 16 sec.
    MHH (A33-12) - GND (A33-22) Y - W-B Rr temp, control switch: Max. COOL → Max. HOT Below 1.0 V → Battery voltage for 16 sec.
    HRC (A33-13) - GND (A33-22) R-Y - W-B Rr FACE mode. Rr blower control switch: OFF → LO Battery voltage → Below 1.0 V
    HRH (A33-14) - GND (A33-22) L-B - W-B Rr FOOT mode. Rr blower control switch: OFF → LO Battery voltage → Below 1.0 V
    VMH (A33-15) - GND (A33-22) R-W - W-B Rr FOOT mode. Rr blower control switch: LO → MIDDLE → HI 7.2 → 4.2 → 0.5 V
    BLWH (A33-16) - GND (A33-22) R-G - W-B Rr FOOT mode. Rr blower control switch: OFF → LO Below 1.0 V → 1.5 to 3.0 V
    CID (A33-18) - GND (A33-22) B - W-B IG ON. Pulse generation
    CSD (A33-19) - GND (A33-22) R- W-B IG ON. Pulse generation
    CLKF (A33-20) - GND (A33-22) W- W-B IG ON. Pulse generation
    GND (A33-22) - Body ground W-B - Body ground Always Continuity
    IG+ (A35-1) - RG (A34-8) L-R - G-W IG ON. 10 to 14 V
    ILL- (A35-5) - RG (A34-8) G - G-W IG ON. Light switch OFF → TAIL 0 → Below 1.0 V
    TR (A35-7) - SGND (A35-12) B - G-Y IG ON. Rr room temperature: 25°C (77°F) 1.8 to 2.2 V
    IG ON. Rr room temperature: 40°C (104°F) 1.2 to 1.6 V
    TSET (A35-8) - SGND (A35-12) L-O - G-Y Rr temperature control switch: Max. COOL → Max. HOT 5.0 → 0 V
    SGND (A34-12) - SG(A33-9) G-Y - Y-G Always Continuity
    RRAT (A34-1) - RG (A34-8) W-G - G-W Rr A/C control panel AUTO switch: OFF → ON (during pushed switch) Battery voltage → Below 1.0 V
    RRAO (A34-2) - RG (A34-8) Y-B - G-W Rr A/C control panel OFF switch: OFF → ON (during pushed switch) Battery voltage → Below 1.0 V
    RRLO (A34-3)- RG (A34-8) GR - G-W Rr A/C control panel LO switch: OFF → ON (during pushed switch) Battery voltage → Below 1.0 V
    RRME (A34-4) - RG (A34-8) L-Y - G-W Rr A/C control panel ME switch: OFF → ON (during pushed switch) Battery voltage → Below 1.0 V
    ATIN (A34-5) - GND (A33-22) L-R - W-B Rr A/C control panel switch: except AUTO → AUTO Battery voltage → Below 1.0 V
    LOIN (A34-6) - GND (A33-22) L-W - W-B Rr A/C control panel switch: except LO → LO Battery voltage → Below 1.0 V
    MEIN (A34-7) - GND (A33-22) L- W-B Rr A/C control panel switch: except MIDDLE → MIDDLE Battery voltage → Below 1.0 V
    RG (A34-8) - GND (A33-22) G-W - W-B Always Continuity
    RRHI (A34-9) - GND (A33-22) GR-R - W-B Rr A/C control panel HI switch: OFF → ON (during pushed switch) Battery voltage → Below 1.0 V
    FACE (A34-10) - GND (A33-22) R-L - W-B Rr A/C control panel FACE switch: OFF → ON (during pushed switch) Battery voltage → Below 1.0 V
    B/L (A34-11) - GND (A33-22) R-Y - W-B Rr A/C control panel B/L switch: OFF → ON (during pushed switch) Battery voltage → Below 1.0 V
    FOOT (A34-12) - GND (A33-22) R-G - W-B Rr A/C control panel FOOT switch: OFF → ON (during pushed switch) Battery voltage → Below 1.0 V
    FCIN (A34-15) - GND (A33-22) G- W-B Rr A/C control panel switch: except FACE → FACE Battery voltage → Below 1.0 V
    BLIN (A34-16) - GND (A33-22) W-G - W-B Rr A/C control panel switch: except B/L → B/L Battery voltage → Below 1.0 V
    FTIN (A34-17) - GND (A33-22) W-R - W-B Rr A/C control panel switch: except FOOT → FOOT Battery voltage → Below 1.0 V
    HIIN (A34-18) - GND (A33-22) L- W-B Rr A/C control panel switch: except HI → HI Battery voltage → Below 1.0 V
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