AIR CONDITIONING SYSTEM TERMINALS OF ECU


  1. AIR CONDITIONING AMPLIFIER ASSEMBLY

    B002KYUN05

    1. Disconnect the air conditioning amplifier assembly I50 connector.

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

      Tech Tips

      Check from the rear of the connector while it is connected to the air conditioning amplifier assembly.

      Terminal No.

      (Symbol)

      		 Wiring Color Terminal Description Condition Specified Condition
      I50-1 (IG+) - Body ground SB - Body ground Power source (IG) Power switch on (IG) 11 to 14 V
      Power switch off Below 1 V
      I50-14 (GND) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
      I50-21 (B) - Body ground GR - Body ground Power source (Back-up) Power switch off 11 to 14 V

    3. Reconnect the air conditioning amplifier assembly I50 connector.

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

      Tech Tips

      Check from the rear of the connector while it is connected to the air conditioning amplifier assembly.

      Terminal No.

      (Symbol)

      		 Wiring Color Terminal Description Condition Specified Condition
      I50-3 (PTC2) - I50-14 (GND)*1 GR - W-B Quick heater assembly operation signal

      • Power switch on (READY)

      • Driving module switch assembly (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

      • IDH terminal signal less than 1 V (Inverter with converter assembly overload not detected)

      • Blower switch: on

      		 Below 1 V

      • Power switch on (READY)

      • Driving module switch assembly (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

      • IDH terminal signal less than 1 V (Inverter with converter assembly overload not detected)

      • Blower switch: off

      		 11 to 14 V
      I50-4 (ECOS) - Body ground R - Body ground Integration control and panel assembly (ECO mode switch) signal

      Power switch on (IG)

      Integration control and panel assembly (ECO mode switch) on

      		 Below 1 V

      Power switch on (IG)

      Intergration control and panel assembly (ECO mode switch) off

      		 11 to 14 V
      I50-5 (TAM) - I50-13 (SG-2)*2 L - G Ambient temperature sensor signal

      Power switch on (IG) (do not start the engine and electric motor)

      Ambient temperature 10 °C (50 °F)

      		 1.8 to 2.4 V

      Power switch on (IG) (do not start the engine and electric motor)

      Ambient temperature 15 °C (59 °F)

      		 1.65 to 2.15 V

      Power switch on (IG) (do not start the engine and electric motor)

      Ambient temperature 20 °C (68 °F)

      		 1.5 to 1.95 V

      Power switch on (IG) (do not start the engine and electric motor)

      Ambient temperature 25°C (77°F)

      		 1.35 to 1.75 V

      Power switch on (IG) (do not start the engine and electric motor)

      Ambient temperature 30 °C (86 °F)

      		 1.2 to 1.55 V

      Power switch on (IG) (do not start the engine and electric motor)

      Ambient temperature 35 °C (95 °F)

      		 1.0 to 1.4 V

      Power switch on (IG) (do not start the engine and electric motor)

      Ambient temperature 40 °C (104 °F)

      		 0.85 to 1.25 V

      Power switch on (IG) (do not start the engine and electric motor)

      Ambient temperature 45 °C (113 °F)

      		 0.75 to 1.10 V

      Power switch on (IG) (do not start the engine and electric motor)

      Ambient temperature 50 °C (122 °F)

      		 0.8 to 1.0 V
      I50-9 (PRE) - I50-10 (S5-3) BE - B Air conditioner pressure sensor signal

      Engine running

      Air conditioning system operating

      Refrigerant pressure: Abnormal pressure (higher than 3025 kPa [30.8 kgf/cm2, 439 psi])

      		 4.73 V or higher

      Engine running

      Air conditioning system operating

      Refrigerant pressure: Abnormal pressure (below 176 kPa [1.8 kgf/cm2, 26 psi])

      		 Below 0.62 V

      Engine running

      Air conditioning system operating

      Refrigerant pressure: Normal pressure (below 3025 kPa [30.8 kgf/cm2, 439 psi] and higher than 176 kPa [1.8 kgf/cm2, 26 psi])

      		 0.62 to 4.73 V
      I50-10 (S5-3) - Body ground B - Body ground Ground for air conditioner pressure sensor, ambient temperature sensor, air conditioning lock sensor Always Below 1 Ω
      I50-11 (CANH)

      B (for LHD)

      P (for RHD)

      		 CAN communication line - -
      I50-12 (CANL) W CAN communication line - -
      I50-13 (SG-2) - Body ground G - Body ground Ground for ambient temperature sensor signal Always Below 1 Ω
      I50-19 (PTC3) - I50-14 (GND)*1 R - W-B Quick heater assembly operation signal

      • Power switch on (READY)

      • Driving module switch assembly (ECO mode switch) off

      • Temperature settings: MAX HOT

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

      • Engine coolant temperature: 60°C (140°F) or lower

      • IDH terminal signal less than 1 V (Inverter with converter assembly overload not detected)

      • Blower switch: on

      		 Below 1 V

      • Power switch on (READY)

      • Driving module switch assembly (ECO mode switch) off

      • Temperature settings: MAX HOT

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

      • Engine coolant temperature: 60°C (140°F) or lower

      • IDH terminal signal less than 1 V (Inverter with converter assembly overload not detected)

      • Blower switch: off

      		 11 to 14 V
      I50-22 (BLW) - Body ground R - Body ground Blower motor speed control signal

      Power switch on (IG)

      Blower switch LO

      Pulse generation

      (See Waveform 1)
      I50-27 (IDH) - I50-14 (GND) W - W-B Inverter with converter assembly current over signal

      • Power switch on (IG)

      • Quick heater assembly operation permitted

      		 Below 1 V

      • Power switch on (IG)

      • Quick heater assembly operation not permitted

      		 4.75 to 5.25 V
      I50-29 (TR) - I50-34 (SG-1) GR - V Room temperature sensor signal

      Power switch on (IG)

      Cabin temperature: 25°C (77°F)

      		 1.8 to 2.2 V

      Power switch on (IG)

      Cabin temperature: 40°C (104°F)

      		 1.2 to 1.6 V
      I50-34 (SG-1) - Body ground V - Body ground Ground for room temperature sensor Always Below 1 Ω
      I50-37 (LIN1) - Body ground B - Body ground LIN communication signal Power switch on (IG) Pulse generation
      I50-40 (PTC1) - I50-14 (GND)*1 B - W-B Quick heater assembly operation signal

      • Power switch on (READY)

      • Driving module switch assembly (ECO mode switch) off

      • Temperature settings: MAX HOT

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

      • Engine coolant temperature: 60°C (140°F) or lower

      • IDH terminal signal less than 1 V (Inverter with converter assembly overload not detected)

      • Blower switch: on

      		 Below 1 V

      • Power switch on (READY)

      • Driving module switch assembly (ECO mode switch) off

      • Temperature settings: MAX HOT

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

      • Engine coolant temperature: 60°C (140°F) or lower

      • IDH terminal signal less than 1 V (Inverter with converter assembly overload not detected)

      • Blower switch: off

      		 11 to 14 V
      z2-2 (BUS G) - Body ground - Ground for BUS IC Always Below 1 V
      z2-3 (BUS) - z2-2 (BUS G) - BUS IC control signal Power switch on (IG)

      Pulse generation

      (See Waveform 1)
      z2-4 (B BUS) - z2-2 (BUS G) - Power supply for BUS IC Always 11 to 14 V
      z2-5 (SGA) - Body ground GR - Body ground Ground for evaporator temperature sensor Always Below 1 V
      z2-6 (TEA) - z2-5 (SGA) GR - GR Evaporator temperature sensor signal

      Power switch on (IG)

      Evaporator temperature: 0°C (32°F)

      		 1.7 to 2.1 V
      z2-6 (TEA) - z2-5 (SGA) GR - GR Evaporator temperature sensor signal

      Power switch on (IG)

      Evaporator temperature: 15°C (59°F)

      		 0.9 to 1.3 V

      *1: w/ PTC Heater

      *2: Using a thermometer, to detects the ambient temperature around the installation area of the thermistor assembly (ambient temperature sensor) is installed

    5. A01CO74N16

      Waveform 1:

      Item Content
      Terminal No. I50-22 (BLW) - Body ground
      Tool Setting 1 V/DIV., 500 μs/DIV.
      Vehicle Condition

      Power switch on (IG)

      Blower switch LO
    6. A01CRMHN03

      Waveform 2:

      Item Content
      Terminal No. z2-3 (BUS) - z2-2 (BUS G)
      Tool Setting 2 V/DIV., 2 ms/DIV.
      Vehicle Condition Power switch on (IG)

  2. AIR CONDITIONING CONTROL ASSEMBLY

    A01COW5E01

    1. Disconnect the I13 air conditioning control assembly connector.

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

      Tech Tips

      Check from the rear of the connector while it is connected to the air conditioning control assembly.

      Terminal No.

      (Symbol)

      		 Wiring Color Terminal Description Condition Specified Condition
      I13-5 (ACC) - I13-14 (GND) W - W-B Power source (ACC) Power switch on (ACC) 11 to 14 V
      Power switch off Below 1 V
      I13-7 (+B) - I13-14 (GND) L - W-B Power source (Back-up) Power switch off 11 to 14 V
      I13-8 (IG+) - I13-14 (GND) LG - W-B Power source (IG) Power switch on (IG) 11 to 14 V
      Power switch off Below 1 V
      I13-14 (GND) - Body ground W-B - Body ground Ground for center cluster module control assembly Always Below 1 Ω

    3. Reconnect the I13 air conditioning control assembly connector.

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

      Tech Tips

      Check from the rear of the connector while it is connected to the air conditioning control assembly.

      Terminal No.

      (Symbol)

      		 Wiring Color Terminal Description Condition Specified Condition
      I13-6 (LIN1) - I13-14 (GND) B - W-B LIN communication signal Power switch on (IG) Pulse generation