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


  1. AIR CONDITIONING AMPLIFIER ASSEMBLY

    B0026OBC01
    *A w/ Rear Face Resister *B w/o Rear Face Resister

    1. Disconnect the G33 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
      G33-1 (IG+) - Body ground G - Body ground Power source (IG) Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V
      G33-14 (GND) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
      G33-21 (B) - Body ground W - Body ground Power source (Back-up) Always 11 to 14 V

    3. Reconnect the G33 air conditioning amplifier assembly connector.

    4. 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
      G33-3 (PTC3) - Body ground*1 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
      G33-4 (SWVC) - Body ground*2, *3 R - Body ground

      • Heater switch assembly operation signal*2

      • Idle up switch operation signal*3

      • Engine running

      • "A/C" switch: On

      • Blower switch: On (LO level)

      • Heater switch assembly: Off → on*2

      • Idle up switch: Off → on*3

      		 Below 1 V → 11 to 14 V
      G33-9 (PSW) - Body ground L - Body ground Air conditioner pressure switch signal

      • Engine running

      • Refrigerant pressure normal

      • Blower switch: On (LO level)

      • "A/C" switch: On

      		 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)

      • Blower switch: On (LO level)

      • "A/C" switch: On

      		 11 to 14 V
      G33-11 (TX+) GR CAN communication line - -
      G33-12 (TX-) W CAN communication line - -
      G33-17 (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
      G33-19 (MG+) - Body ground*2 P - Body ground Viscous with magnetic clutch heater assembly operation signal

      • Engine running

      • Blower switch: On (LO level)

      • Heater switch assembly: Off or on (magnet clutch off)

      		 11 to 14 V

      • Engine running

      • Blower switch: On (LO level)

      • Heater switch assembly: On (magnet clutch on)

      		 Below 1 V
      G33-20 (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
      G33-22 (BLW) - Body ground P - Body ground Blower motor speed control signal

      • Ignition switch ON

      • Blower switch: On (LO level)

      Pulse generation

      (See Waveform 1)
      G33-24 (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
      G33-29 (TR) - G33-34 (SG-2) V - L Room temperature sensor signal

      • Ignition switch ON

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

      		 1.8 to 2.2 V

      • Ignition switch ON

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

      		 1.2 to 1.6 V
      G33-30 (S5-3) - Body ground G - Body ground Power supply for solar sensor Ignition switch ON 4.5 to 5.5 V
      G33-33 (TSD) - Body ground P - Body ground Solar sensor signal

      • Ignition switch ON

      • Solar sensor subjected to electric light

      		 0.8 to 4.3 V

      • Ignition switch ON

      • Solar sensor covered with cloth

      		 Below 0.8 V
      G33-34 (SG-2) - Body ground L - Body ground Ground for room temperature sensor Always Below 1 Ω
      G33-37 (LIN1) - Body ground R - Body ground LIN communication signal Ignition switch ON Pulse generation
      G33-39 (PTC1) - Body ground*1 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
      G33-40 (PTC2) - Body ground*1 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

      z5-3 (BUS) - z5-2 (BUSG)*4

      z6-3 (BUS) - z6-2 (BUSG)*5

      		 - BUS IC control signal Ignition switch ON

      Pulse generation

      (See Waveform 2)

      z5-2 (BUSG) - Body ground*4

      z6-2 (BUSG) - Body ground*5

      		 - Ground for BUS IC Always Below 1 Ω

      z5-4 (BBUS) - z5-2 (BUSG)*4

      z6-4 (BBUS) - z6-2 (BUSG)*5

      		 - Power supply for BUS IC Always 11 to 14 V

      z5-5 (SG-4) - Body ground*4

      z6-5 (SG-4) - Body ground*5

      		 - Ground for evaporator temperature sensor Always Below 1 Ω

      z5-6 (TE) - z5-5 (SG-4)*4

      z6-6 (TE) - z6-5 (SG-4)*5

      		 - Evaporator temperature sensor signal

      • Ignition switch ON

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

      		 1.7 to 2.1 V

      • Ignition switch ON

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

      		 0.9 to 1.3 V

      • *1: w/ PTC Heater

      • *2: w/ Viscous Heater

      • *3: w/ Idle Up Switch

      • *4: w/ Rear Face Resister

      • *5: w/o Rear Face Resister

    5. B0024JHN01

      Waveform 1:

      Item Content
      Terminal No. G33-22 (BLW) - Body ground
      Tool Setting 2 V/DIV., 500 μs/DIV.
      Vehicle Condition

      • Ignition switch ON

      • Blower switch: On (LO level)
    6. B00254WN03

      Waveform 2:

      Item Content
      Terminal No.

      z5-3 (BUS) - z5-2 (BUSG)*1

      z6-3 (BUS) - z6-2 (BUSG)*2
      Tool Setting 2 V/DIV., 2 ms/DIV.
      Vehicle Condition Ignition switch ON

      • *1: w/ Rear Face Resister

      • *2: w/o Rear Face Resister

  2. AIR CONDITIONING CONTROL ASSEMBLY

    B00253TN02

    1. Disconnect the G32 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
      G32-2 (IG) - Body ground L - Body ground Power source (IG) Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V
      G32-4 (GND) - Body ground W-B - Body ground Ground for air conditioning control assembly Always Below 1 Ω

    3. Reconnect the G32 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
      G32-3 (LIN1) - Body ground R - Body ground LIN communication signal Ignition switch ON Pulse generation

  3. ECM