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Terminals Of Ecu

WARNING: This page is about a different car, the 2006 Scion tC. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY 
    1. Disconnect the connector from the air conditioning amplifier assembly and inspect the connector on the wire harness side, as shown in the table below.
      Fig 1: Disconnecting Connector From Air Conditioning Amplifier Assembly
      G04223487Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      WIRING COLOR AND TERMINAL DESCRIPTION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (C4-9) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
      IG (C4-20) - GND (C4-9) P - W-B Power source (IG) Ignition switch: ON 10 to 14 V
      +B (C4-40) - GND (C4-9) V - W-B Power source (Back-up) Always 10 to 14 V

      If the results are not as specified, inspect the circuits connected to the other parts.

    2. Connect the connector to the air conditioning amplifier assembly and inspect the wire harness side connector from the backside, as shown in the table below.
      Fig 2: Connecting Connector To Air Conditioning Amplifier Assembly
      G04223488Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      WIRING COLOR AND TERMINAL DESCRIPTION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      REC (C4-1) - GND (C4-9) L - W-B Air inlet control servomotor operation voltage Ignition switch: ON
      R/F switch: FRESH --> RECIRCULATION      		 10 to 14 V --> Below 1 V
      FRS (C4-21) - GND (C4-9) R - W-B Air inlet control servomotor operation voltage Ignition switch: ON
      R/F switch: FRESH --> RECIRCULATION      		 10 to 14 V --> Below 1 V
      AOF (C4-3) - GND (C4-9) W - W-B Air vent mode control servomotor operation voltage Ignition switch: ON
      Mode switch: DEF --> FACE      		 10 to 14 V --> Below 1 V
      DEF (C4-4) - C4-9 (GND) LG - W-B Air vent mode control servomotor operation voltage Ignition switch: ON
      Mode switch: FACE --> DEF      		 10 to 14 V --> Below 1 V
      AMC (C4-5) - GND (C4-9) G - W-B Air mix control servomotor operation voltage Ignition switch: ON
      Set temperature switch: MAX HOT --> MAX COOL      		 10 to 14 V --> Below 1 V
      AMH (C4-6) - GND (C4-9) GR - W-B Air mix control servomotor operation voltage Ignition switch: ON
      Set temperature switch: MAX HOT --> MAX COOL      		 10 to 14 V --> Below 1 V
      A/CS (C4-7) - GND (C4-9) P - W-B Magnetic clutch operation signal Ignition switch: ON
      Magnetic clutch: OFF --> ON      		 10 to 14 V --> Below 1 V
      S5-TP (C4-8) - SG-TP (C4-30) V - Y Power supply for air mix control servomotor Ignition switch: ON 4.5 to 5.5 V
      GND (C4-9) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
      RrDEF (C4-11) - GND (C4-9) P - W-B Rear defogger relay signal Ignition switch: ON
      DEF switch: OFF --> ON      		 10 to 14 V --> Below 1 V
      FrHR (C4-12) - GND (C4-9) BR - W-B A/C switch relay signal Ignition switch: ON
      Blower switch: LO
      A/C switch: OFF --> ON      		 10 to 14 V --> Below 1 V
      BLC (C4-13) - GND (C4-9) L - W-B Blower motor speed control signal Ignition switch: ON
      Blower switch: ON      		 Pulse generation (see waveform 1 )
      SPD (C4-14) - GND (C4-9) O - W-B Vehicle speed signal Ignition switch: ON
      Turn front wheel slowly      		 Pulse generation (see waveform 2)
      TAMOUT (C4-15) - GND (C4-9) B - W-B A/C ambient temperature signal Ignition switch: ON
      Ambient temperature: 25°C (77°F) --> 40°C (104°F)      		 Pulse generation
      IG (C4-20) - GND (C4-9) P - W-B Power source (IG) Ignition switch: ON 10 to 14 V
      REC (C4-21) - GND (C4-9) V - W-B Air vent mode control servomotor position signal Ignition switch: ON
      Mode switch: DEF --> FACE      		 0.7 to 4.3 V
      TP (C4-22) - GND (C4-9) B - W-B Air vent mode control servomotor position signal Ignition switch: ON
      Set temperature switch: MAX HOT --> MAX COOL      		 0.7 to 4.3 V
      TAM (C4-23) - GND (C4-9) B - W-B A/C ambient temperature sensor signal Ignition switch: ON
      Ambient temperature: 25°C (77°F) --> 40°C (104°F)      		 1.35 to 1.75 V --> 0.85 to 1.25 V
      HAZ (C4-25) - GND (C4-9) O - W-B Hazard switch signal Ignition switch: ON
      Hazard switch: OFF --> ON      		 10 to 14 V --> Below 1 V
      S5-TPM (C4-28) - SGTPM (C4-29) L - G Air vent mode control servomotor position signal Ignition switch: ON 4.5 to 5.5 V
      SG-TAM (C4-31) - Body ground B - Body ground Ground for ambient temperature sensor Always Below 1 Ω
      +B (C4-401) - GND (C4-9) V - W-B Power source (Back-up) Always 10 to 14 V
      Fig 3: Identifying Waveform 1 (Reference)
      G04223489Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Waveform 1:

        Measure the waveform between terminals C4-13 (BLC) and A4-9 (GND).

        OK: A waveform should be output as shown in the illustration. 

        HINT:

        Waveform cycle varies with the blower level.

      2. Waveform 2:

        Measure the waveform between terminals C4-13 (BLC) and A4-9 (GND).

        OK: A waveform should be output as shown in the illustration. 

        HINT:

        As vehicle speed increases, the cycle of the signal waveform becomes narrow.

        Fig 4: Identifying Waveform 2 (Reference)
        G04223490Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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