Air Conditioning System (For Manual Air Conditioning System) Terminals Of Ecu

  1. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

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

  1. CHECK INTEGRATION CONTROL AND PANEL ASSEMBLY

  1. CHECK AIR CONDITIONING CONTROL ASSEMBLY (w/ Rear Air Conditioning System, w/o Rear Seat Heater)

  1. CHECK AIR CONDITIONING CONTROL ASSEMBLY (w/ Rear Air Conditioning System, w/ Rear Seat Heater)

Air Conditioning System (For Manual Air Conditioning System) -- Terminals Of Ecu



CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Manual Air Conditioning System) Terminals Of Ecu

  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

  3. Reconnect the G24 and G25 amplifier connectors.

  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
    G25-3 (PTC1) - Body ground*8
    		V - Body ground
    		PTC NO.1 relay operation signal*9
    PTC HTR NO.1 relay operation signal*10
    1. Engine running (1250 rpm or more)
    2. Temperature setting MAX HOT
    3. Outside temperature 10°C (50°F) or less
    4. Engine coolant temperature 79°C (175°F) or less
    5. Headlight dimmer switch off
    6. Blower switch off → on
    		11 to 14 V → Below 1 V
    G25-4 (PTC3) - Body ground*8
    		P - Body ground
    		PTC NO.3 relay operation signal*9
    PTC HTR NO.3 relay operation signal*10
    1. Engine running (1250 rpm or more)
    2. Temperature setting MAX HOT
    3. Outside temperature 10°C (50°F) or less
    4. Engine coolant temperature 73°C (163°F) or less
    5. Headlight dimmer switch off
    6. Blower switch off → on
    		11 to 14 V → Below 1 V
    G25-5 (TAM) - G25-13 (SG-2)
    		V - G
    		Cooler thermistor (ambient temperature sensor) signal
    1. Ignition switch ON
    2. 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
    1. Ignition switch ON
    2. Ambient temperature 40°C (104°F)
    		0.9 to 1.2 V
    G25-8 (LOCK) - G25-13 (SG-2)*2
    		R - G
    		A/C compressor lock sensor signal
    1. Engine running
    2. Blower switch LO
    3. A/C switch on (magnet clutch on)
    		Pulse generation
    (See waveform 1)
    G25-9 (PRE) - G25-13 (SG-2)*3
    		G - G
    		Air conditioner pressure sensor signal
    1. Ignition switch ON
    2. 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
    1. Ignition switch ON
    2. 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
    1. Ignition switch ON
    2. 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
    1. Ignition switch ON
    2. 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
    1. Ignition switch ON
    2. 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
    1. Engine running
    2. Cooler control switch sub-assembly on
    		Below 1 V
    G25-16 (MG+) - G25-14 (GND)*7
    		V - W-B
    		Viscous with magnetic clutch heater assembly operation signal
    1. Engine running
    2. Power heater switch on
    		Below 1 V
    G25-17 (AC1) - G25-14 (GND)
    		LG - W-B
    		Compressor operation signal
    1. Engine running
    2. Blower switch LO
    3. A/C switch off
    		11 to 14 V
    1. Engine running
    2. Blower switch LO
    3. A/C switch on
    		Below 1 V
    G25-18 (HTR1) - G25-14 (GND)
    		G - W-B
    		Engine operating signal
    		Engine idling
    		11 to 14 V
    G25-20 (MGC) - G25-14 (GND)
    		R - W-B
    		Magnet clutch assembly operation signal
    1. Engine running
    2. A/C switch off → on
    3. Blower switch LO
    4. Magnet clutch assembly off → on
    		11 to 14 V → Below 1 V
    G25-22 (PTC2) - Body ground*8
    		LG - Body ground
    		PTC NO.2 relay operation signal*9
    PTC HTR NO.2 relay operation signal*10
    1. Engine running (1250 rpm or more)
    2. Temperature setting MAX HOT
    3. Outside temperature 10°C (50°F) or less
    4. Engine coolant temperature 76°C (169°F) or less
    5. Headlight dimmer switch off
    6. Blower switch off → on
    		11 to 14 V → Below 1 V
    G25-23 (BLW) - G25-14 (GND)
    		L - W-B
    		Blower with fan motor sub-assembly control signal
    1. Ignition switch ON
    2. Blower switch LO
    		Pulse generation
    (See waveform 2)
    G25-25 (ALT) - G25-14 (GND)*8
    		L - W-B
    		Generator signal (PTC heater control)
    		Engine started
    		Pulse generation
    G25-27 (ACT) - G25-14 (GND)
    		R - W-B
    		Compressor operation signal
    1. Engine running
    2. Blower switch LO
    3. A/C switch off (magnet clutch off)
    		Below 1 V
    1. Engine running
    2. Blower switch LO
    3. A/C switch on (magnet clutch on)
    		4.75 to 5.25 V
    G25-36 (SWVC) - G25-14 (GND)*6
    		W - W-B
    		Idle up switch operation signal
    1. Ignition switch ON
    2. Idle up switch on
    		Below 1 V
    G25-36 (SWVC) - G25-14 (GND)*7
    		W - W-B
    		Heater switch assembly operation signal
    1. Ignition switch ON
    2. Heater switch assembly on
    		Below 1 V
    G25-37 (LIN1) - Body ground
    		P - Body ground
    		LIN communication signal
    		Ignition switch ON
    		Pulse generation
    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
    1. Ignition switch ON
    2. Rear evaporator temperature 0°C (32°F)
    		2.0 to 2.4 V
    1. Ignition switch ON
    2. Rear evaporator temperature: 15°C (59°F)
    		1.4 to 1.8 V
    G24-12 (SWCB) - G25-14 (GND)*5
    		LG - W-B
    		Cooling box assembly operation signal
    1. Engine running
    2. A/C switch on
    3. Cooler control switch sub-assembly on
    		Below 1 V
    G24-13 (RLIN) - Body ground*1
    		L - Body ground
    		LIN communication signal
    		Ignition switch ON
    		Pulse generation
    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
    1. Ignition switch ON
    2. Rear blower switch on
    		Pulse generation
    (See waveform 3)
    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
    1. Ignition switch ON
    2. Evaporator temperature 0°C (32°F)
    		1.7 to 2.1 V
    1. Ignition switch ON
    2. Evaporator temperature 15°C (59°F)
    		0.9 to 1.3 V
    1. *1: w/ Rear Air Conditioning System
    2. *2: except 5L-E
    3. *3: for Sensor Type
    4. *4: for Switch Type
    5. *5: w/ Refrigerated Cool Box
    6. *6: w/ Idle Up Switch
    7. *7: w/ Viscous Heater
    8. *8: w/ PTC Heater
    9. *9: w/o Urea SCR System
    10. *10: w/ Urea SCR System


    5. Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Manual Air Conditioning System) Terminals Of Ecu

  5. Using an oscilloscope, check waveform 1.

    A/C Compressor Lock Sensor Signal
    Item
    		Content
    Terminal No. (Symbol)
    		G25-8 (LOCK) - G25-14 (GND)
    Tool Setting
    		200 mV/DIV., 10 ms./DIV.
    Condition
    1. Engine running
    2. Blower switch LO
    3. A/C switch on (magnet clutch on)


    6. Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Manual Air Conditioning System) Terminals Of Ecu

  6. Using an oscilloscope, check waveform 2.

    Blower Motor Control Signal
    Item
    		Content
    Terminal No. (Symbol)
    		G25-23 (BLW) - H46-14 (GND)
    Tool Setting
    		1 V/DIV., 500 μs/DIV.
    Condition
    1. Ignition switch ON
    2. Blower switch LO
    HINT:
    When the blower level is increased, the duty ratio changes accordingly.


    7. Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Manual Air Conditioning System) Terminals Of Ecu

  7. Using an oscilloscope, check waveform 3.

    Blower Motor Control Signal
    Item
    		Content
    Terminal No. (Symbol)
    		G24-22 (BLWH) - G24-20 (RGND)
    Tool Setting
    		2 V/DIV., 500 μs/DIV.
    Condition
    1. Ignition switch ON
    2. Blower switch LO
    HINT:
    When the blower level is increased, the duty ratio changes accordingly.

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

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Manual Air Conditioning System) Terminals Of Ecu

  1. Disconnect the air conditioning amplifier (for cooling box) connectors.

  2. Measure the 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
    Ignition switch off
    		Below 1 V

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

  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
    1. Engine running
    2. Cooler control switch on
    		Below 1 V
    6 (CBI) - 4 (GND)
    		L-G - W-B
    		Cooler compressor permission signal
    1. Engine running
    2. Cooler control switch sub-assembly on
    		Below 1 V
    7 (LED) - 4 (GND)
    		L-B - W-B
    		Cooling box indicator signal
    1. Engine running
    2. Cooler control switch sub-assembly on
    		Below 1 V
    8 (CBT) - 4 (GND)
    		BR-Y - W-B
    		Air conditioning amplifier assembly request signal
    1. Engine running
    2. 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
    1. Engine running
    2. Cooler control switch sub-assembly on
    		Below 1 V
    10 (SG) - 4 (GND)
    		W-L - W-B
    		Ground
    		Always
    		Below 1 Ω

CHECK INTEGRATION CONTROL AND PANEL ASSEMBLY

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Manual Air Conditioning System) Terminals Of Ecu

  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
    Ignition switch off
    		Below 1 V
    G23-6 (ACC) - G23-4 (GND)
    		P - W-B
    		ACC power supply
    		Ignition switch ACC
    		11 to 14 V
    Ignition switch off
    		Below 1 V
    G23-4 (GND) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω

  3. Reconnect the G23 panel connector.

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

    Terminal No. (Symbol)
    		Wiring Color
    		Terminal Description
    		Switch Condition
    		Specified Condition
    G23-3 (LIN1) - Body ground
    		P - Body ground
    		LIN communication signal
    		Ignition switch ON
    		Pulse generation

CHECK AIR CONDITIONING CONTROL ASSEMBLY (w/ Rear Air Conditioning System, w/o Rear Seat Heater)

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Manual Air Conditioning System) Terminals Of Ecu

  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
    Ignition switch off
    		Below 1 V
    T3-8 (E) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω

  3. Reconnect the T3 control connector.

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

    Terminal No. (Symbol)
    		Wiring Color
    		Terminal Description
    		Switch Condition
    		Specified Condition
    T3-3 (RLIN) - Body ground
    		L - Body ground
    		LIN communication signal
    		Ignition switch ON
    		Pulse generation

CHECK AIR CONDITIONING CONTROL ASSEMBLY (w/ Rear Air Conditioning System, w/ Rear Seat Heater)

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Manual Air Conditioning System) Terminals Of Ecu

  1. Disconnect the T7 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
    T7-1 (IG) - T7-8 (E)
    		L - W-B
    		IG power supply
    		Ignition switch ON
    		11 to 14 V
    Ignition switch off
    		Below 1 V
    T7-8 (E) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω

  3. Reconnect the T7 control connector.

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

    Terminal No. (Symbol)
    		Wiring Color
    		Terminal Description
    		Switch Condition
    		Specified Condition
    T7-6 (RLIN) - Body ground
    		L - Body ground
    		LIN communication signal
    		Ignition switch ON
    		Pulse generation