AIR CONDITIONING SYSTEM TERMINALS OF ECU


  1. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

    B0019EXE02

    1. Disconnect the E36 and E35 air conditioning amplifier assembly 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 (E1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E35-17 (RHTR) - E35-31 (SGND) W - GR Power supply for duct sensor RH

      • Engine switch on (IG)

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

      		 4850 to 5150 Ω
      E35-18 (RHTL) - E35-31 (SGND) V - GR Power supply for duct sensor LH

      • Engine switch on (IG)

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

      		 4850 to 5150 Ω
      E36-1 (GND) - Body ground BR - Body ground Ground Always Below 1 Ω
      E36-5 (IG+) - E36-1 (GND) G - BR Ignition power supply Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      E36-6 (+B1) - E36-1 (GND) LG - BR Battery power supply Always 11 to 14 V
      E36-7 (+B2) - E36-1 (GND) LG - BR Battery power supply Always 11 to 14 V

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

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      E35-1 (SG-1) - Body ground B - Body ground Ground for room temperature sensor (for front) Always Below 1 Ω
      E35-9 (PRE) - E35-32 (SG-2) R - G Air conditioning pressure sensor signal

      • Engine switch on (IG)

      • A/C switch off

      		 0.63 to 4.78 V

      • Engine idling

      • A/C switch on

      • Blower switch LO

      • Refrigerant pressure is normal

      		 0.63 to 4.78 V

      Refrigerant pressure: Abnormal (less than 177 kPa [1.8 kgf/cm2, 26 psi])

      		 Below 0.63 V

      Refrigerant pressure: Abnormal (more than 3079 kPa [31.4 kgf/cm2, 446 psi])

      		 4.78 V or higher
      E35-10 (TAM) - E35-32 (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
      E35-11 (TEC) - E35-33 (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
      E35-13 (S5-3) - E35-32 (SG-2) LG - G Power supply for air conditioner pressure Engine switch on (IG) 4.75 to 5.25 V
      E35-16 (TR) - E35-1 (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
      Room temperature sensor signal (for front)

      • Engine switch on (IG)

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

      		 1.0 to 2.0 V
      E35-21 (TR) - E35-33 (SG) R - P 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
      E35-22 (TSET) - E35-33 (SG) R - P 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
      E35-23 (NAIN) - Body ground*6 L - Body ground No. 1 ion generator sub-assembly condition signal

      • Engine switch on (IG)

      • Blower switch: LO

      • "nanoe": Off

      		 4.75 to 5.25 V

      • Engine switch on (IG)

      • Blower switch: LO

      • "nanoe": On

      		 Below 2.2 V
      E35-28 (SW 1) - Body ground*1, *5 P - Body ground Idle up switch*1 or Heater switch assembly*5 operation signal

      • Engine running

      • A/C switch on

      • Blower switch on (LO level)

      • Idle up switch off → on*1

      • Heater switch assembly off → on*5

      		 Below 1 V → 11 to 14 V
      E35-29 (COOL) - Body ground*4 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
      E35-30 (LOCK) - E35-32 (SG-2) L - G Compressor lock sensor signal

      • Engine idling

      • A/C switch on (magnet clutch on)

      • Blower switch: LO

      Pulse generation

      (see waveform 1)
      E35-31 (SGND) - Body ground GR - Body ground Ground for duct sensor RH Always Below 1 Ω
      E35-32 (SG-2) - Body ground G - Body ground Ground for pressure sensor, cooler compressor Always Below 1 Ω
      E35-33 (SG) - Body ground P - Body ground Ground for evaporator temperature sensor signal (for rear), rear room temperature sensor signal LH and RH Always Below 1 Ω
      E36-3 (BLW) - E36-1 (GND) R - BR Blower motor control signal

      • Engine switch on (IG)

      • Blower switch: LO

      Pulse generation

      (see waveform 2)

      • Engine switch on (IG)

      • Blower switch: Off

      		 4.5 to 5.5 V
      E36-8 (PTC1) - Body ground*2 W - Body ground Quick heater assembly operation signal

      • Engine idling

      • Set temperature: MAX HOT (HI)

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

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

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

      		 11 to 14 V → Below 1 V
      E36-10 (NANO) - Body ground*6 R - Body ground No. 1 ion generator sub-assembly operation signal

      • Engine switch on (IG)

      • Blower switch: LO

      • "nanoe": Off

      		 4.75 to 5.25 V

      • Engine switch on (IG)

      • Blower switch: LO

      • "nanoe": On

      		 Below 1 V
      E36-11 (AC1) - Body ground L - Body ground Compressor operation signal

      • Engine idling

      • Blower switch LO

      • A/C switch off

      		 11 to 14 V

      • Engine idling

      • Blower switch LO

      • A/C switch on

      		 Below 1 V
      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 - BR 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 - BR Magnet clutch operation signal

      • Engine idling

      • Blower switch: LO

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

      		 Below 1 V

      • Engine idling

      • Blower switch: LO

      • A/C switch on (magnet clutch on)

      		 11 to 14 V
      E36-19 (RMGV) - E36-1 (GND) B - BR Rear cooling unit expansion valve signal

      • Engine switch on (IG)

      • Blower switch LO

      • A/C switch on

      		 11 to 14 V
      E36-22 (ACT) - Body ground G - Body ground Compressor operation signal

      • Engine idling

      • Blower switch LO

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

      		 Below 1 V

      • Engine idling

      • Blower switch LO

      • A/C switch on (magnet clutch on)

      		 11 to 14 V
      E36-23 (ALT) - Body ground R - Body ground Generator assembly signal Engine switch on (IG) Pulse generation
      E36-24 (PTC3) - Body ground*2 R - Body ground Quick heater assembly operation signal

      • Engine idling

      • Set temperature: MAX HOT (HI)

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

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

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

      		 11 to 14 V → Below 1 V
      E36-26 (PTC2) - Body ground*2 B - Body ground Quick heater assembly operation signal

      • Engine idling

      • Set temperature: MAX HOT (HI)

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

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

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

      		 11 to 14 V → Below 1 V
      E36-27 (CFN+) - Body ground*3 R - Body ground Condenser fan operation signal Engine switch on (IG) 11 to 14 V
      E36-29 (ECOS) - Body ground B - Body ground Integration control and panel assembly (ECO mode switch) operation signal

      • Engine switch on (IG)

      • Integration control and panel assembly (ECO mode switch) on

      		 Below 1 V

      • Engine switch on (IG)

      • Integration control and panel assembly (ECO mode switch) off

      		 11 to 14 V
      E36-32 (MGCA) - Body ground*5 P - Body ground Viscous with magnet clutch operation signal

      • Engine idling

      • Blower switch LO

      • Heater switch assembly on

      		 Below 1 V
      z66-1 (BUS G) - Body ground - Ground for BUS IC (for front) Always Below 1 Ω
      z66-2 (BUS) - z66-1 (BUS G) - BUS IC control signal (for front) Engine switch on (IG) Pulse generation
      z66-3 (B BUS) - z66-1 (BUS G) - Power supply for BUS IC (for front) Always 11 to 14 V
      z66-11 (TE) - z66-12 (SG) - Evaporator temperature sensor signal

      • Engine switch on (IG)

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

      		 1.0 to 1.2 V
      z66-12 (SG) - Body ground - Ground for evaporator temperature sensor Always Below 1 Ω

      • *1: w/ Idle Up Switch

      • *2: w/ PTC Heater

      • *3: w/ Condenser Fan

      • *4: w/ Cool Box

      • *5: w/ Heater Switch

      • *6: w/ Ion Generator

    5. B001AI4E03

      Using an oscilloscope, check waveform 1.

      Tech Tips

      When the engine speed is increased, the duty ratio changes accordingly.

      Item Content
      Terminal No. (Symbol) E35-30 (LOCK) - E35-32 (SG-2)
      Tool Setting 200 mV/DIV., 10 ms/DIV.
      Condition

      • Engine idling

      • A/C switch on (magnet clutch on)

      • Blower switch: LO
    6. B0018VDE12

      Using an oscilloscope, check waveform 2.

      Tech Tips

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

      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
    7. B001AJRE02

      Using an oscilloscope, check waveform 3.

      Tech Tips

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

      Item Content
      Terminal No. (Symbol) E36-17 (BLWH) - E36-1 (GND)
      Tool Setting 2 V/DIV., 500 μs/DIV.
      Condition

      • Engine switch on (IG)

      • Blower switch: LO

  2. CHECK COOLER CONTROL SWITCH ASSEMBLY

    B001B0JE02
    Text in Illustration
    *A for LHD
    *B for RHD

    • *1: for LHD

    • *2: for RHD


    1. Disconnect the r2*1 or r1*2 cooler control switch 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
      r2-6 (IG) - Body ground*1 B - Body ground Ignition power supply Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      r1-6 (IG) - Body ground*2 B - Body ground Ignition power supply Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      r2-5 (E) - Body ground*1 W-B - Body ground Ground Always Below 1 Ω
      r1-5 (E) - Body ground*2 W-B - Body ground Ground Always Below 1 Ω

    3. Reconnect the r2*1 or r1*2 cooler control switch assembly connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      r2-10 (RLIN) - Body ground*1 GR - Body ground LIN communication signal Engine switch on (IG) Pulse generation
      r1-10 (RLIN) - Body ground*2 GR - Body ground LIN communication signal Engine switch on (IG) Pulse generation
      r2-12 (RLSB) - Body ground*1 B - Body ground Rear seat LH detection sensor signal line

      • Engine switch on (IG)

      • Rear seat LH not occupied

      		 11 to 14 V

      • Engine switch on (IG)

      • Rear seat LH occupied

      		 Below 1 V
      r1-12 (RLSB) - Body ground*2 B - Body ground Rear seat LH detection sensor signal line

      • Engine switch on (IG)

      • Rear seat LH not occupied

      		 11 to 14 V

      • Engine switch on (IG)

      • Rear seat LH occupied

      		 Below 1 V
      r2-13 (RRSB) - Body ground*1 P - Body ground Rear seat RH detection sensor signal line

      • Engine switch on (IG)

      • Rear seat RH not occupied

      		 11 to 14 V

      • Engine switch on (IG)

      • Rear seat RH occupied

      		 Below 1 V
      r1-13 (RRSB) - Body ground*2 P - Body ground Rear seat RH detection sensor signal line

      • Engine switch on (IG)

      • Rear seat RH not occupied

      		 11 to 14 V

      • Engine switch on (IG)

      • Rear seat RH occupied

      		 Below 1 V

  3. MULTI-DISPLAY ASSEMBLY Click here

  4. MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here