AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System) TERMINALS OF ECU


  1. AIR CONDITIONING AMPLIFIER ASSEMBLY (for Front)

    B003LEMN01
    *1 za

    1. Disconnect the G37 air conditioning amplifier assembly connector.

    2. Measure the resistance and voltage according to the value(s) in the table below.

      Terminal No.

      (Symbol)

      		 Wiring Color Terminal Description Condition Specified Condition
      G37-1 (IG+) - Body ground G - Body ground Power source (IG) Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      G37-14 (GND) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
      G37-21 (B) - Body ground W - Body ground Power source (Back-up) Always 11 to 14 V

    3. Reconnect the G37 air conditioning amplifier assembly connector.

    4. Disconnect the za air conditioning harness assembly connector.

    5. Measure the resistance, voltage and check for waveform according to the value(s) in the table below.

      Terminal No.

      (Symbol)

      		 Wiring Color Terminal Description Condition Specified Condition
      G37-3 (PTC3) - Body ground SB - Body ground Quick heater assembly operation signal

      • Engine starts

      • ECO mode switch: Off

      • Temperature settings: MAX HOT

      • Ambient temperature: 10°C (50°F) or lower

      • Engine coolant temperature: 64°C (147°F) or lower

      • Light control switch: Off

      • Blower switch: Off → on (after 30 seconds)

      		 11 to 14 V → Below 1 V
      G37-4 (SWVC) - Body ground R - Body ground Idle up switch operation signal

      • Engine running

      • "A/C" switch: On

      • Blower switch: On (LO level)

      • Idle up switch: Off → on

      		 Below 1 V → 11 to 14 V
      G37-9 (PSW) - Body ground L - Body ground Air conditioner pressure switch signal

      • Engine running

      • Refrigerant pressure normal

      		 Below 1 V

      • Engine running

      • Refrigerant pressure less than 0.196 MPa (2.0 kgf/cm2, 28 psi) or more than 3.14 MPa (32.0 kgf/cm2, 455 psi)

      		 11 to 14 V
      G37-11 (TX+) GR CAN communication line - -
      G37-12 (TX-) W CAN communication line - -
      G37-17 (AC1) - Body ground GR - Body ground Idle-up request signal

      • Engine running

      • Blower switch: On (LO level)

      • "A/C" switch: Off

      		 11 to 14 V

      • Engine running

      • Blower switch: On (LO level)

      • "A/C" switch: On

      		 Below 1 V
      G37-20 (MGC) - Body ground V - Body ground Magnet clutch drive output signal

      • Engine running

      • Blower switch: On (LO level)

      • "A/C" switch: Off or on (magnet clutch off)

      		 11 to 14 V

      • Engine running

      • Blower switch: On (LO level)

      • "A/C" switch: On (magnet clutch on)

      		 Below 1 V
      G37-22 (BLW) - Body ground P - Body ground Blower motor speed control signal

      • Engine switch on (IG)

      • Blower switch: LO

      Pulse generation

      (See Waveform 1)
      G37-23 (RCRL) - Body ground Y - Body ground Rear blower motor speed control signal

      • Engine switch on (IG)

      • Blower switch: LO

      Pulse generation

      (See Waveform 1)
      G37-24 (ACT) - Body ground LG - Body ground Magnet clutch on permit input signal

      • Engine running

      • Blower switch: On (LO level)

      • "A/C" switch: Off or on (magnet clutch off)

      		 Below 1 V

      • Engine running

      • Blower switch: On (LO level)

      • "A/C" switch: On (magnet clutch on)

      		 4.5 to 5.5 V
      G37-29 (TR) - G37-34 (SG-2) V - L Room temperature sensor signal

      • Engine switch on (IG)

      • Cabin temperature: 25°C (77°F)

      		 1.8 to 2.2 V

      • Engine switch on (IG)

      • Cabin temperature: 40°C (104°F)

      		 1.2 to 1.6 V
      G37-30 (S5-3) - Body ground G - Body ground Power supply for solar sensor Engine switch on (IG) 4.5 to 5.5 V
      G37-33 (TSD) - Body ground P - Body ground Solar sensor signal

      • Engine switch on (IG)

      • Solar sensor subjected to electric light

      • Vehicle indoors

      		 0.8 to 4.3 V

      • Engine switch on (IG)

      • Solar sensor covered with cloth

      • Vehicle indoors

      		 Below 0.8 V
      G37-34 (SG-2) - Body ground L - Body ground Ground for room temperature sensor Always Below 1 Ω
      G37-37 (LIN1) - Body ground R - Body ground LIN communication signal Engine switch on (IG) Pulse generation
      G37-39 (PTC1) - Body ground L - Body ground Quick heater assembly operation signal

      • Engine starts

      • ECO mode switch: Off

      • Temperature settings: MAX HOT

      • Ambient temperature: 10°C (50°F) or lower

      • Engine coolant temperature: 64°C (147°F) or lower

      • Light control switch: Off

      • Blower switch: Off → on (after 10 seconds)

      		 11 to 14 V → Below 1 V
      G37-40 (PTC2) - Body ground W - Body ground Quick heater assembly operation signal

      • Engine starts

      • ECO mode switch: Off

      • Temperature settings: MAX HOT

      • Ambient temperature: 10°C (50°F) or lower

      • Engine coolant temperature: 64°C (147°F) or lower

      • Light control switch: Off

      • Blower switch: Off → on (after 20 seconds)

      		 11 to 14 V → Below 1 V
      za-2 (BUS) - za-2 (BUSG) - BUS IC control signal Engine switch on (IG)

      Pulse generation

      (See Waveform 2)
      za-3 (BUSG) - Body ground - Ground for BUS IC Always Below 1 Ω
      za-4 (BBUS) - za-2 (BUSG) - Power supply for BUS IC Always 11 to 14 V
      za-5 (SG-4) - Body ground GR - Body ground Ground for evaporator temperature sensor Always Below 1 Ω
      za-6 (TE) - za-5 (SG-4) GR - GR Evaporator temperature sensor signal

      • Engine switch on (IG)

      • Evaporator temperature: 0°C (32°F)

      		 1.7 to 2.1 V

      • Engine switch on (IG)

      • Evaporator temperature: 15°C (59°F)

      		 0.9 to 1.3 V
    6. B003JBDN01

      Waveform 1:

      Item Content
      Terminal No.

      G37-22 (BLW) - Body ground

      G37-23 (RCRL) - Body ground
      Tool Setting 2 V/DIV., 500 μs/DIV.
      Vehicle Condition

      • Engine switch on (IG)

      • Blower switch: LO
    7. B003L7SN03

      Waveform 2:

      Item Content
      Terminal No. za-3 (BUS) - za-2 (BUSG)
      Tool Setting 2 V/DIV., 2 ms/DIV.
      Vehicle Condition Engine switch on (IG)

  2. AIR CONDITIONING CONTROL ASSEMBLY

    B003PV9N01

    1. Disconnect the G36 air conditioning control assembly connector.

    2. Measure the resistance and voltage according to the value(s) in the table below.

      Terminal No.

      (Symbol)

      		 Wiring Color Terminal Description Condition Specified Condition
      G36-2 (IG+) - Body ground L - Body ground Power source (IG) Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      G36-4 (GND) - Body ground W-B - Body ground Ground for air conditioning control assembly Always Below 1 Ω

    3. Reconnect the G36 air conditioning control assembly connector.

    4. Measure the waveform according to the value(s) in the table below.

      Terminal No.

      (Symbol)

      		 Wiring Color Terminal Description Condition Specified Condition
      G36-3 (LIN1) - Body ground R - Body ground LIN communication signal Engine switch on (IG) Pulse generation

  3. INTEGRATION CONTROL AND PANEL ASSEMBLY

    B003J68N01

    1. Disconnect the N34 integration control and panel assembly connector.

    2. Measure the resistance and voltage according to the value(s) in the table below.

      Terminal No.

      (Symbol)

      		 Wiring Color Terminal Description Condition Specified Condition
      N34-8 (IG+) - Body ground G - Body ground Power source (IG) Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      N34-5 (GND) - Body ground W-B - Body ground Ground for air conditioning control assembly Always Below 1 Ω

    3. Reconnect the N34 integration control and panel assembly connector.

    4. Measure the waveform according to the value(s) in the table below.

      Terminal No.

      (Symbol)

      		 Wiring Color Terminal Description Condition Specified Condition
      N34-6 (LIN1) - Body ground R - Body ground LIN communication signal Engine switch on (IG) Pulse generation

  4. ECM

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