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


  1. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

    A01DPG7E23

    1. Disconnect the G24 and G25 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
      G25-21 (B) - G25-14 (GND) V - W-B Battery power source Always 11 to 14 V
      G25-1 (IG+) - G25-14 (GND) L - W-B Ignition power supply Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V
      G25-14 (GND) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
      G24-20 (RGND) - Body ground*1 W-B - Body ground Ground for main power supply Always Below 1 Ω
      G24-24 (+B2) - G24-20 (RGND)*1 GR - W-B Battery power source 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 G24 and G25 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
      G25-3 (PTC1) - Body ground*2 V - Body ground PTC NO. 1 relay operation signal

      • Engine running (1250 rpm or more)

      • Temperature setting MAX HOT

      • Outside temperature 10°C (50°F) or less

      • Engine coolant temperature 79°C (175°F) or less

      • Headlight dimmer switch off

      • Blower switch on

      		 11 to 14 V*10
      G25-4 (PTC3) - Body ground*2 P - Body ground PTC NO. 3 relay operation signal

      • Engine running (1250 rpm or more)

      • Temperature setting MAX HOT

      • Outside temperature 10°C (50°F) or less

      • Engine coolant temperature 73°C (163°F) or less

      • Headlight dimmer switch off

      • Blower switch on

      		 11 to 14 V*10
      G25-5 (TAM) - G25-13 (SG-2) V - G Cooler thermistor (ambient temperature sensor) signal

      • Ignition switch ON

      • Ambient temperature 25°C (77°F)

      		 1.35 to 1.75 V
      G25-5 (TAM) - G25-13 (SG-2) V - G Cooler thermistor (ambient temperature sensor) signal

      • Ignition switch ON

      • Ambient temperature 40°C (104°F)

      		 0.9 to 1.2 V
      G25-8 (LOCK) - G25-13 (SG-2) R - G A/C compressor lock sensor signal

      • Engine running

      • Blower switch LO

      • A/C switch on

      Pulse generation

      (See waveform 1)
      G25-9 (PRE) - G25-13 (SG-2)*3 G - G Air conditioner pressure sensor signal

      • Ignition switch ON

      • Refrigerant pressure normal (below 3.025 MPa [30.9 kgf/cm2, 438.6 psi] and higher than 0.176 MPa [1.8 kgf/cm2, 25.5 psi])

      		 0.63 to 4.72 V
      G25-9 (PRE) - G25-13 (SG-2)*3 G - G Air conditioner pressure sensor signal

      • Ignition switch ON

      • Refrigerant pressure abnormal (below 0.176 MPa [1.8 kgf/cm2, 25.5 psi])

      		 Below 0.63 V
      G25-9 (PRE) - G25-13 (SG-2)*3 G - G Air conditioner pressure sensor signal

      • Ignition switch ON

      • Refrigerant pressure abnormal (higher than 3.025 MPa [30.9 kgf/cm2, 438.6 psi])

      		 4.72 V or higher
      G25-9 (PRE) - Body ground*4 G - Body ground No. 1 pressure switch signal

      • Ignition switch ON

      • Refrigerant pressure normal (below 3.14 MPa [32.0 kgf/cm2, 455 psi] and higher than 0.196 MPa [2.0 kgf/cm2, 28 psi])

      		 Below 1 V
      G25-9 (PRE) - Body ground*4 G - Body ground No. 1 pressure switch signal

      • Ignition switch ON

      • Refrigerant pressure abnormal (below 0.196 MPa [2.0 kgf/cm2, 28 psi] or higher than 3.14 MPa [32.0 kgf/cm2, 455 psi])

      		 4.69 V or higher
      G25-10 (S5-3) - G25-13 (SG-2) B - G Power supply for air conditioner pressure sensor Ignition switch ON 4.75 to 5.25 V
      G25-15 (COOL) - G25-14 (GND)*5 V - W-B Cooling box assembly operation signal

      • Engine running

      • Cooler control switch sub-assembly on

      		 Below 1 V
      G25-16 (MG+) - G25-14 (GND)*6 V - W-B Viscous with magnetic clutch heater assembly operation signal

      • Engine running

      • Power heater switch on

      		 Below 1 V
      G25-17 (AC1) - G25-14 (GND) LG - W-B Compressor operation signal

      • Ignition switch ON

      • A/C switch on

      		 Below 1 V
      G25-18 (MHTR) - G25-14 (GND) G - W-B MIR HTR relay signal

      • Ignition switch ON

      • Mirror heater switch on

      		 Below 1 V
      G25-20 (MGC) - G25-14 (GND) R - W-B Magnet clutch assembly operation signal

      • Ignition switch ON

      • Blower switch LO

      • A/C switch on

      		 Below 1 V
      G25-22 (PTC2) - Body ground*2 LG - Body ground PTC NO. 2 relay operation signal

      • Engine running (1250 rpm or more)

      • Temperature setting MAX HOT

      • Outside temperature 10°C (50°F) or less

      • Engine coolant temperature 76°C (169°F) or less

      • Headlight dimmer switch off

      • Blower switch on

      		 11 to 14 V*10
      G25-23 (BLW) - G25-14 (GND) L - W-B Blower with fan motor sub-assembly control signal

      • Ignition switch ON

      • Blower switch LO

      Pulse generation

      (See waveform 2)
      G25-25 (ALT) - G25-14 (GND)*2 L - W-B Generator signal (PTC heater control) Engine started Pulse generation
      G25-27 (ACT) - G25-14 (GND) R - W-B Compressor operation signal

      • Ignition switch ON

      • A/C switch on

      		 4.75 to 5.25 V
      G25-29 (TR) - G25-34 (SG-1) GR - P Cooler thermistor (room temperature sensor) signal

      • Ignition switch ON

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

      		 1.8 to 2.2 V

      • Ignition switch ON

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

      		 1.2 to 1.6 V
      G25-32 (TSP) - G25-14 (GND)

      V - W-B*8

      G - W-B*9

      		 Automatic light control sensor (solar sensor) power signal (for front passenger side)

      • Ignition switch ON

      • Solar sensor subjected to electric light

      • Vehicle indoors

      		 0.8 to 4.3 V

      • Ignition switch ON

      • Automatic light control sensor (solar sensor) covered with cloth

      • Vehicle indoors

      		 Below 0.8 V
      G25-33 (TSD) - G25-14 (GND)

      G - W-B*8

      V - W-B*9

      		 Automatic light control sensor (solar sensor) power signal (for driver side)

      • Ignition switch ON

      • Solar sensor subjected to electric light

      • Vehicle indoors

      		 0.8 to 4.3 V

      • Ignition switch ON

      • Automatic light control sensor (solar sensor) covered with cloth

      • Vehicle indoors

      		 Below 0.8 V
      G25-36 (SWVC) - G25-14 (GND)*6, *7 W - W-B

      • Heater switch assembly operation signal*6

      • Idle up switch operation signal*7

      • Ignition switch ON

      • A/C switch on

      • Heater switch assembly on*5

      • Idle up switch on*6

      		 Below 1 V
      G24-1 (RBUS) - G24-21 (RBUG)*1 LG - L BUS IC control signal (for Rear) Ignition switch ON Pulse generation
      G24-4 (TEC) - G24-19 (SGND)*1 SB - V Rear evaporator temperature sensor signal

      • Ignition switch ON

      • Rear evaporator temperature 0°C (32°F)

      		 2.0 to 2.4 V

      • Ignition switch ON

      • Rear evaporator temperature 15°C (59°F)

      		 1.4 to 1.8 V
      G24-7 (SG-6) - Body ground*1 R - Body ground Ground for cooler thermistor (rear room temperature sensor) Always Below 1 V
      G24-12 (SWCB) - G25-14 (GND)*5 LG - W-B Cooling box assembly operation signal

      • Ignition switch ON

      • A/C switch on

      • Cooler control switch sub-assembly on

      		 Below 1 V
      G24-17 (TR) - G24-7 (SG-6)*1 B - R Cooler thermistor (rear 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
      G24-19 (SGND) - Body ground*1 V - Body ground Ground for rear evaporator temperature sensor Always Below 1 V
      G24-20 (RGND) - Body ground*1 W-B - Body ground Ground for power supply Always Below 1 V
      G24-22 (BLWH) - G24-20 (RGND)*1 W - W-B Rear blower with fan motor sub-assembly control signal

      • Ignition switch ON

      • Rear blower switch on

      Pulse generation

      (See waveform 2)
      G24-23 (RBBU) - G24-21 (RBUG)*1 P - L Power supply for BUS IC (for Rear) Always 11 to 14 V
      z1-2 (BUS G) - Body ground - Ground for BUS IC Always Below 1 V
      z1-3 (BUS) - z1-2 (BUS G) - BUS IC control signal Ignition switch ON Pulse generation
      z1-4 (B BUS) - z1-2 (BUS G) - Power supply for BUS IC Always 11 to 14 V
      z1-6 (TEA) - z1-5 (SGA) - No. 1 cooler thermistor 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/ Rear Air Conditioning System

      • *2: w/ PTC Heater

      • *3: for 1KD-FTV or w/ Rear Air Conditioning System

      • *4: except 1KD-FTV and w/o Rear Air Conditioning System

      • *5: w/ Refrigerated Cool Box

      • *6: w/ Viscous Heater

      • *7: w/ Idle Up Switch

      • *8: for LHD

      • *9: for RHD

      Tech Tips

      *10: After the measurement conditions are met, wait 30 seconds before performing measurements.


      • If the result is not as specified, the air conditioning amplifier assembly may have a malfunction.

    5. A01DLZNE01

      Using an oscilloscope, check waveform 1.

      A/C Compressor Lock Sensor Signal
      Item Content
      Terminal No. (Symbol) G25-8 (LOCK) - G25-13 (SG-2)
      Tool Setting 200 mV/DIV., 10 ms./DIV.
      Condition

      • Engine running

      • A/C switch on

      • Blower switch LO
    6. A01DRWEE12

      Using an oscilloscope, check waveform 2.

      Blower Motor Control Signal
      Item Content
      Terminal No. (Symbol)

      • G25-23 (BLW) - G25-14 (GND)

      • G24-22 (BLWH) - G24-20 (RGND)
      Tool Setting 1 V/DIV., 500 μs/DIV.
      Condition

      • Ignition switch ON

      • Blower switch LO

      Tech Tips

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

  2. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (FOR COOLING BOX) (w/ Refrigerated Cool Box)

    A01DSPW

    1. Disconnect the air conditioning amplifier (for cooling box) 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
      1 (+B) - 4 (GND) W-R - W-B Battery power source Always 11 to 14 V
      2 (IG+) - 4 (GND) GR - W-B IG power supply Ignition switch ON 11 to 14 V

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

    3. Reconnect the air conditioning amplifier (for cooling box) connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      5 (SW) - 4 (GND) LG-R - W-B Cooler control switch sub-assembly operation signal

      • Engine running

      • Cooler control switch sub-assembly on

      		 Below 1 V
      6 (CBI) - 4 (GND) L-G - W-B Cooler compressor permission signal

      • Engine running

      • Cooler control switch sub-assembly on

      		 Below 1 V
      7 (LED) - 4 (GND) L-B - W-B Cooling box indicator signal

      • Engine running

      • Cooler control switch sub-assembly on

      		 Below 1 V
      8 (CBT) - 4 (GND) BR-Y - W-B Air conditioning amplifier assembly request signal

      • Engine running

      • Cooler control switch sub-assembly on

      		 Below 1 V
      9 (BLW) - 4 (GND) W - W-B No. 1 cooler blower motor sub-assembly operation signal

      • Engine running

      • Cooler control switch sub-assembly on

      		 Below 1 V
      10 (SG) - 4 (GND) W-L - W-B Ground Always Below 1 Ω

  3. CHECK INTEGRATION CONTROL AND PANEL ASSEMBLY

    A01DP0GE04

    1. Disconnect the G23 panel 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
      G23-1 (+B) - G23-4 (GND) L - W-B Battery power source Always 11 to 14 V
      G23-5 (IG) - G23-4 (GND) L - W-B IG power supply Ignition switch ON 11 to 14 V
      G23-6 (ACC) - G23-4 (GND) P - W-B ACC power supply Ignition switch ACC 11 to 14 V
      G23-4 (GND) - 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.

  4. CHECK AIR CONDITIONING CONTROL ASSEMBLY (w/ Rear Air Conditioning System)

    A01DP0GE05

    1. Disconnect the T3 control 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
      T3-5 (IG) - T3-8 (E) L - W-B IG power supply Ignition switch ON 11 to 14 V
      T3-8 (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 DRIVER SIDE JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    A01DMMGE09

    1. Remove the main body ECU Click here.

    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
      A-11 (GND1) - Body ground - Ground Always Below 1 Ω
      A-29 (ACC) - Body ground - ACC power supply Ignition switch ACC 11 to 14 V
      A-31 (ALTB) - Body ground - Battery power supply Always 11 to 14 V
      A-32 (IG) - Body ground - Ignition switch power supply Ignition switch ON 11 to 14 V

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

    3. Install the main body ECU Click here.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      G64-20 (CLTB) - Body ground P - Body ground Automatic light control sensor power supply output Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      G64-22 (CLTE) - Body ground L - Body ground Automatic light control sensor ground Always Below 1 Ω

      • If the result is not as specified, the main body ECU or driver side junction block assembly may have a malfunction.