AIR CONDITIONING SYSTEM TERMINALS OF ECU


  1. AIR CONDITIONING AMPLIFIER ASSEMBLY

    B002ECZE10

    1. Disconnect the K64 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
      K64-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      K64-5 (IG+) - K64-1 (GND) B - W-B Power source (IG) Engine switch on (IG) 11 to 14 V
      K64-5 (IG+) - K64-1 (GND) B - W-B Power source (IG) Engine switch off Below 1 V
      K64-6 (+B1) - K64-1 (GND) W - W-B Power source (Back-up) Always 11 to 14 V

      Tech Tips

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Reconnect the K64 air conditioning amplifier assembly connector.

    4. Measure the resistance and voltage, and check for 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
      K64-3 (BLW) - K64-1 (GND) G - W-B Blower motor speed control signal

      Engine switch on (IG)

      Blower switch: Lo

      Pulse generation

      (See waveform 1)
      K64-4 (SOL+) - K64-1 (GND) P - W-B Compressor solenoid operation signal

      Engine running

      Blower switch: Lo

      A/C switch: on

      Pulse generation

      (See waveform 2)
      K64-21 (RLIN) - K64-1 (GND)*4 P - W-B LIN communication signal Engine switch on (IG) Pulse generation
      K64-29 (ECOS) - K64-1 (GND) B - W-B Combination switch assembly operation signal

      Engine switch on (IG)

      Combination switch assembly not turned

      		 11 to 14 V
      K64-29 (ECOS) - K64-1 (GND) B - W-B Combination switch assembly operation signal

      Engine switch on (IG)

      Combination switch assembly being turned and held at ECO position

      		 Below 1 V
      K65-1 (SG-1) - Body ground G - Body ground Ground for room temperature sensor Always Below 1 Ω
      K65-3 (CANH) - K65-4 (CANL)

      Y - W*1

      BE - W*2

      		 CAN communication system CAN communication occurring Pulse generation
      K65-7 (TSD) - K64-1 (GND)*1 B - W-B Solar sensor signal (for Driver side)

      Engine switch on (IG)

      Solar sensor subjected to electric light

      		 0.8 to 4.3 V
      K65-7 (TSD) - K64-1 (GND)*1 B - W-B Solar sensor signal (for Driver side)

      Engine switch on (IG)

      Solar sensor covered with a cloth

      		 Below 0.8 V
      K65-7 (TSD) - K64-1 (GND)*2 V - W-B Solar sensor signal (for Driver side)

      Engine switch on (IG)

      Solar sensor subjected to electric light

      		 0.8 to 4.3 V
      K65-7 (TSD) - K64-1 (GND)*2 V - W-B Solar sensor signal (for Driver side)

      Engine switch on (IG)

      Solar sensor covered with a cloth

      		 Below 0.8 V
      K65-8 (TSP) - K64-1 (GND)*1 W - W-B Solar sensor signal (for Front passenger side)

      Engine switch on (IG)

      Solar sensor subjected to electric light

      		 0.8 to 4.3 V
      K65-8 (TSP) - K64-1 (GND)*1 W - W-B Solar sensor signal (for Front passenger side)

      Engine switch on (IG)

      Solar sensor covered with a cloth

      		 Below 0.8 V
      K65-8 (TSP) - K64-1 (GND)*2 W - W-B Solar sensor signal (for Front passenger side)

      Engine switch on (IG)

      Solar sensor subjected to electric light

      		 0.8 to 4.3 V
      K65-8 (TSP) - K64-1 (GND)*2 W - W-B Solar sensor signal (for Front passenger side)

      Engine switch on (IG)

      Solar sensor covered with a cloth

      		 Below 0.8 V
      K65-9 (PRE) - K65-32 (SG-2) P - P Air conditioning pressure sensor signal

      Engine running

      Blower switch: Lo

      A/C switch: on

      Refrigerant pressure: normal pressure (more than 176 kPa [1.8 kgf/cm2, 26 psi] to less than 3025 kPa [30.8 kgf/cm2, 439 psi])

      		 0.74 to 4.61 V
      K65-10 (TAM) - K65-32 (SG-2) B - P Ambient temperature sensor signal

      Engine switch on (IG) (does not start the engine)

      Ambient temperature: 10°C (50°F)

      		 1.8 to 2.4 V

      Engine switch on (IG) (does not start the engine)

      Ambient temperature: 15°C (59°F)

      		 1.65 to 2.15 V

      Engine switch on (IG) (does not start the engine)

      Ambient temperature: 20°C (68°F)

      		 1.5 to 1.95 V

      Engine switch on (IG) (does not start the engine)

      Ambient temperature: 25°C (77°F)

      		 1.35 to 1.75 V

      Engine switch on (IG) (does not start the engine)

      Ambient temperature: 30°C (86°F)

      		 1.2 to 1.55 V

      Engine switch on (IG) (does not start the engine)

      Ambient temperature: 35°C (95°F)

      		 1.0 to 1.4 V

      Engine switch on (IG) (does not start the engine)

      Ambient temperature: 40°C (104°F)

      		 0.85 to 1.25 V

      Engine switch on (IG) (does not start the engine)

      Ambient temperature: 45°C (113°F)

      		 0.75 to 1.10 V

      Engine switch on (IG) (does not start the engine)

      Ambient temperature: 50°C (122°F)

      		 0.65 to 1.0 V
      K65-13 (S5-3) - K65-32 (SG-2) LG - P Power supply for flow sensor Engine switch off Below 1 V
      K65-13 (S5-3) - K65-32 (SG-2) LG - P Power supply for flow sensor Engine switch on (IG) 4.75 to 5.25 V
      K65-16 (TR) - K65-1 (SG-1) P - G Room temperature sensor signal

      Engine switch on (IG)

      Cabin temperature: 25°C (77°F)

      		 1.8 to 2.2 V
      K65-24 (DGS) - K65-32 (SG-2)*3 R - P Smog ventilation sensor signal (CO, HC)

      Engine switch on (IG)

      Cabin temperature: 20°C (68°F)

      Glass humidity: 60%

      Spray the clean air

      		 15 to 40 kΩ
      K65-24 (DGS) - K65-32 (SG-2)*3 R - P Smog ventilation sensor signal (CO, HC)

      Engine switch on (IG)

      Cabin temperature: 20°C (68°F)

      Glass humidity: 40%

      Spray the clean air

      		 1.5 to 240 kΩ
      K65-25 (DGS1) - K65-32 (SG-2)*3 G - P Smog ventilation sensor signal (NOx)

      Engine switch on (IG)

      Cabin temperature: 20°C (68°F)

      Glass humidity: 65%

      Spray the clean air

      		 2.5 to 40 kΩ
      K65-32 (SG-2) - Body ground P - Body ground Ground for air conditioning pressure sensor, ambient temperature sensor and smog ventilation sensor*3 Always Below 1 Ω
      z1-1 (BUS G) - Body ground - Ground for BUS IC Always Below 1 Ω
      z1-2 (BUS) - z1-1 (BUS G) - BUS IC control signal Engine switch on (IG)

      Pulse generation

      (See waveform 3)
      z1-3 (B BUS) - z1-1 (BUS G) - Power supply for BUS IC Always 11 to 14 V
      z1-12 (SGA) - Body ground - Ground for evaporator temperature sensor Always Below 1 V
      z1-11 (TEA) - z1-12 (SGA) - Evaporator temperature sensor signal

      Engine switch on (IG)

      Evaporator temperature: 0°C (32°F)

      		 1.7 to 2.1 V
      z1-11 (TEA) - z1-12 (SGA) - Evaporator temperature sensor signal

      Engine switch on (IG)

      Evaporator temperature: 15°C (59°F)

      		 0.9 to 1.3 V

      • *1: for LHD

      • *2: for RHD

      • *3: w/ Smog Ventilation Sensor

      • *4: w/ Rear Control Switch

    5. A01Q8C8E41

      Waveform 1:

      Item Content
      Terminal No. (Symbol) K64-3 (BLW) - K64-1 (GND)
      Tool Setting 1 V/DIV., 500 μs/DIV.
      Vehicle Condition

      Engine switch on (IG)

      Blower switch: Lo
    6. A01Q8WCE24

      Waveform 2:

      Item Content
      Terminal No. (Symbol) K64-4 (SOL+) - K64-1 (GND)
      Tool Setting 5 V/DIV., 500 μs/DIV.
      Vehicle Condition

      Engine running

      Blower switch: Lo

      A/C switch: on
    7. A01Q96XE06

      Waveform 3:

      Item Content
      Terminal No. (Symbol) z1-2 (BUS) - z1-1 (BUS G)
      Tool Setting 1 V/DIV., 2 ms./DIV.
      Vehicle Condition Engine switch on (IG)

  2. REAR CONTROL SWITCH (w/ Rear Control Switch)

    A01QCCEE01

    1. Disconnect the e1 rear control switch connector.

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

      Terminal No.

      (Symbol)

      		 Wiring Color Terminal Description Condition Specified Condition
      e1-1 (+B) - e1-5 (E) R - W-B Power source (Back-up) Always 11 to 14 V
      e1-5 (E) - Body ground W-B - Body ground Ground Always Below 1 Ω
      e1-7 (IG+) - e1-5 (E) L - W-B Power source (IG) Engine switch off Below 1 V
      e1-7 (IG+) - e1-5 (E) L - W-B Power source (IG) Engine switch on (IG) 11 to 14 V

      Tech Tips

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Reconnect the e1 rear control switch 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 rear control switch.

      Terminal No.

      (Symbol)

      		 Wiring Color Terminal Description Condition Specified Condition
      e1-9 (RLIN) - e1-5 (E) P - W-B LIN communication signal Engine switch on (IG) Pulse generation