AIR CONDITIONING SYSTEM TERMINALS OF ECU


  1. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

    A01EQY8E09

    1. Disconnect the E35 and E36 air conditioning amplifier connectors.

    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
      E35-6 (E2) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E36-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E36-2 (E1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E36-5 (IG+) - E36-1 (GND) G - W-B IG power supply Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      E36-6 (+B1) - E36-1 (GND) R - W-B Battery power supply Always 11 to 14 V
      E36-7 (+B2) - E36-1 (GND) R - W-B Battery power supply Always 11 to 14 V

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

    3. Reconnect the E35 and E36 air conditioning amplifier connectors.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      E35-1 (SG) - Body ground P - Body ground Ground for evaporator temperature sensor signal (for rear) Always Below 1 Ω
      E35-2 (SG-6) - Body ground G - Body ground Ground for room temperature sensor signal (for rear LH and rear RH) Always Below 1 Ω
      E35-7 (TSD) - Body ground LG - Body ground Driver side solar sensor signal

      Engine switch on (IG)

      Solar sensor subjected to electric light

      		 0.8 to 4.3 V
      E35-8 (TSP) - Body ground GR - Body ground Front passenger side solar sensor signal

      Engine switch on (IG)

      Solar sensor subjected to electric light

      		 0.8 to 4.3 V
      E35-9 (TR) - E35-32 (SG-1) W - B Room temperature sensor signal (for front)

      Engine switch on (IG)

      Front side interior temperature: 25°C (77°F)

      		 1.9 to 2.1 V

      Engine switch on (IG)

      Front side interior temperature: 50°C (122°F)

      		 1.0 to 2.0 V
      E35-10 (TAM) - E35-16 (SG-2) V - G Ambient temperature sensor signal

      Engine switch on (IG)

      Ambient temperature:

      25°C (77°F)

      		 1.4 to 1.6 V

      Engine switch on (IG)

      Ambient temperature:

      50°C (122°F)

      		 0.7 to 0.9 V
      E35-12 (SG-9) - Body ground L - Body ground Ground for duct sensor (for front passenger side) Always Below 1 Ω
      E35-16 (SG-2) - Body ground G - Body ground Ground for pressure sensor Always Below 1 Ω
      E35-17 (TEC) - E35-1 (SG) W - P Evaporator temperature sensor signal (for rear)

      Engine switch on (IG)

      Evaporator temperature:

      15°C (59°F)

      		 1.4 to 1.8 V
      E35-18 (TR) - E35-2 (SG-6) R - G Room temperature sensor signal (for rear LH)

      Engine switch on (IG)

      Vehicle interior temperature: 25°C (77°F)

      		 1.9 to 2.1 V

      Engine switch on (IG)

      Vehicle interior temperature: 50°C (122°F)

      		 1.0 to 1.2 V
      E35-19 (TR7) - E35-2 (SG-6) R - G Room temperature sensor signal (for rear RH)

      Engine switch on (IG)

      Vehicle interior temperature: 25°C (77°F)

      		 1.9 to 2.1 V

      Engine switch on (IG)

      Vehicle interior temperature: 50°C (122°F)

      		 1.0 to 1.2 V
      E35-20 (PRE) - E35-16 (SG-2) R - G Air conditioning pressure sensor signal

      Refrigerant pressure:

      Normal pressure (less than 3.0732 MPa [31.4 kgf/cm2, 445 psi] and more than 0.1762 MPa [1.8 kgf/cm2, 25 psi])

      		 1.0 to 4.8 V

      Refrigerant pressure:

      Abnormal (less than 0.1762 MPa [1.8 kgf/cm2, 25 psi])

      		 Below 1 V

      Refrigerant pressure:

      Abnormal (more than 3.0732 MPa [31.4 kgf/cm2, 445 psi])

      		 4.8 V or higher
      E35-23 (DGS) - E35-30 (SG-4) L - L Exhaust gas sensor signal (CO, HC) 30 seconds after engine switch on (IG) and sensor exposed to exhaust gas 1.0 to 4.5 V
      E35-24 (DGS1) - E35-30 (SG-4) W - L Exhaust gas sensor signal (NOx) 30 seconds after engine switch on (IG) and sensor exposed to exhaust gas 1.0 to 4.5 V
      E35-25 (TR3) - Body ground V - Body ground Power supply for driver side duct sensor

      • Engine switch on (IG)

      • Driver side duct sensor temperature: 25°C (77°F)

      		 4.8 to 5.2 kΩ
      E35-26 (TR4) - Body ground W - Body ground Power supply for front passenger side duct sensor

      • Engine switch on (IG)

      • Front passenger side duct sensor temperature: 25°C (77°F)

      		 4.8 to 5.2 kΩ
      E35-27 (S5-1) - E35-16 (SG-2) LG - G Power supply for pressure sensor Engine switch on (IG) 4.5 to 5.5 V
      E35-28 (LOCK) - E35-29 (SG-5) L - G Air compressor lock sensor signal

      Engine idling

      A/C switch: On

      Blower switch: Lo

      Pulse generation

      (See waveform 1)
      E35-29 (SG-5) - Body ground G - Body ground Ground for compressor signal Always Below 1 Ω
      E35-32 (SG-1) - Body ground B - Body ground Ground for room temperature sensor (for front) Always Below 1 Ω
      E35-34 (SGND) - Body ground BR - Body ground Ground for duct sensor (for driver side) Always Below 1 Ω
      E36-3 (BLW) - E36-1 (GND) R - W-B Blower motor control signal

      Engine switch on (IG)

      Blower switch: Lo

      Pulse generation

      (See waveform 2)
      E36-12 (RBUG) - Body ground BR - Body ground Ground for BUS IC (for rear) Always Below 1 Ω
      E36-13 (RBUS) - E36-12 (RBUG) R - BR BUS IC control signal (for rear) Engine switch on (IG) Pulse generation
      E36-14 (RBBU) - E36-12 (RBUG) L - BR Power supply for BUS IC (for rear) Always 11 to 14 V
      E36-17 (BLWH) - E36-1 (GND) L - W-B Blower motor control signal (for rear)

      Engine switch on (IG)

      Blower switch: Lo

      Pulse generation

      (See waveform 3)
      E36-18 (MGC) - E36-1 (GND) R - W-B Compressor magnet clutch operation signal

      Engine idling

      Blower switch: Lo

      A/C switch: Off or on (magnet clutch not on permitted)

      		 11 to 14 V

      Engine idling

      Blower switch: Lo

      A/C switch: On (magnet clutch on permitted)

      		 Below 1 V
      E36-19 (RMGV) - E36-1 (GND) B - W-B Rear cooling unit expansion valve signal Engine switch on (IG) 11 to 14 V
      E36-22 (ACT) - Body ground G - Body ground Compressor operation signal

      Engine switch on (IG)

      A/C switch: Off

      		 4.5 to 5.5 V

      Engine switch on (IG)

      A/C switch: On (magnet clutch on)

      		 Below 1 V
      E36-25 (CFN+) - Body ground R - Body ground Condenser FAN operation signal Engine switch on (IG) 11 to 14 V
      E36-26 (PTC2) - Body ground* R - Body ground PTC2 heater relay operation signal

      Engine idling

      Set temperature: Hi

      Engine coolant temperature: Below 65°C (149°F)

      Ambient temperature: Below 10°C (50°F)

      Blower switch: Off → lo

      		 Below 1 V → 11 to 14 V
      E36-27 (PTC1) - Body ground* R - Body ground PTC1 heater relay operation signal
      E36-35 (PTC3) - Body ground* R - Body ground PTC3 heater relay operation signal
      E36-29 (AC1) - Body ground L - Body ground Compressor operation signal

      Engine switch on (IG)

      A/C switch: Off

      		 11 to 14 V

      Engine switch on (IG)

      A/C switch: On

      		 Below 1 V
      E36-31 (ALT) - Body ground* R - Body ground Generator signal Engine idling Pulse generation
      E36-33 (COOL) - Body ground W - Body ground Cool box operation signal

      Engine switch on (IG)

      Cool box switch: On

      		 Below 1 V

      Engine switch on (IG)

      Cool box switch: Off

      		 11 to 14 V
      z45-1 (BUS G) - Body ground - Ground for BUS IC (for front) Always Below 1 Ω
      z45-2 (BUS) - z45-1 (BUS G) - BUS IC control signal (for front) Engine switch on (IG) Pulse generation
      z45-3 (B BUS) - z45-1 (BUS G) - Power supply for BUS IC (for front) Always 11 to 14 V
      z45-6 (SGA) - Body ground - Ground for evaporator temperature sensor Always Below 1 Ω
      z45-7 (TEA) - z45-6 (SGA) - Evaporator temperature sensor signal

      Engine switch on (IG)

      Evaporator temperature: 15°C (59°F)

      		 1.0 to 1.2 V
      z45-8 (BUS G) - Body ground - Ground for BUS IC (for front) Always Below 1 Ω
      z45-9 (BUS) - z45-8 (BUS G) - BUS IC control signal (for front) Engine switch on (IG) Pulse generation
      z45-10 (B BUS) - z45-8 (BUS G) - Power supply for BUS IC (for front) Always 11 to 14 V

      • *: w/ PTC Heater

    5. A01EPCOE01

      Using an oscilloscope, check waveform 1.

      Compressor Lock Sensor Signal
      Item Content
      Terminal No. (Symbol) E35-28 (LOCK) - E35-29 (SG-5)
      Tool Setting 200 mV/DIV., 10 ms/DIV.
      Condition

      Engine idling

      Blower switch: Lo

      A/C switch: On

      Tech Tips

      When the rear blower level is increased, the duty ratio changes accordingly.

    6. A01EOHSE12

      Using an oscilloscope, check waveform 2.

      Blower Motor Control Signal
      Item Content
      Terminal No. (Symbol) E36-3 (BLW) - E36-1 (GND)
      Tool Setting 1 V/DIV., 500 μs/DIV.
      Condition

      Engine switch on (IG)

      Blower switch: Lo

      Tech Tips

      When the blower level is increased, the duty ratio changes accordingly.

    7. A01EOHSE12

      Using an oscilloscope, check waveform 3.

      Rear Blower Motor Control Signal
      Item Content
      Terminal No. (Symbol) E36-17 (BLWH) - E36-1 (GND)
      Tool Setting 1 V/DIV., 500 μs/DIV.
      Condition

      Engine switch on (IG)

      Blower switch: Lo

      Tech Tips

      When the rear blower level is increased, the duty ratio changes accordingly.

  2. CHECK MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here

  3. CHECK MULTI-DISPLAY ASSEMBLY Click here

  4. CHECK NO. 2 AIR CONDITIONING CONTROL ASSEMBLY

    A01ESEHE01

    1. Disconnect the E55 switch 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
      E55-6 (IG) - E55-1 (E) G - W-B IG power supply Always 11 to 14 V
      E55-1 (E) - Body ground W-B - Body ground Ground Always Below 1 Ω

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

  5. CHECK MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)

    A01EOYJE03

    1. Disconnect the 2A, 2D, E1, E2 and E3 ECU connectors.

    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
      2D-62 (GND2) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E3-1 (GND3) - Body ground BR - Body ground Ground Always Below 1 Ω
      E1-6 (AM1) - 2D-62 (GND2) W - W-B Battery power supply Always 11 to 14 V
      E2-1 (AM2) - 2D-62 (GND2) W - W-B Battery power supply Always 11 to 14 V
      2A-1 (IG) - 2D-62 (GND2) B - W-B IG power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V

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