RM36D0EC _58 Vehicle Interior _083104 HEATING / AIR CONDITIONING _0402828 AIR CONDITIONING SYSTEM(for Gasoline Model) U

HEATING / AIR CONDITIONING AIR CONDITIONING SYSTEM(for Gasoline Model) TERMINALS OF ECU

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

2.115,0.115 2.615,0.365 0.5,0.25 3.573,0.115 4.073,0.365 0.5,0.25 4.823,0.115 5.323,0.365 0.5,0.25 3.646,1.385 4.146,1.635 0.5,0.25 5.063,1.385 5.563,1.635 0.5,0.25 6.229,1.385 6.729,1.635 0.5,0.25 2.219,0.156 2.677,0.354 0.458,0.198 10 false G47 3.688,0.156 4.146,0.354 0.458,0.198 10 false G46 4.958,0.156 5.417,0.354 0.458,0.198 10 false z11 6.354,1.427 6.813,1.625 0.458,0.198 10 false z11 5.167,1.427 5.625,1.625 0.458,0.198 10 false G46 3.76,1.427 4.219,1.625 0.458,0.198 10 false G47 0.073,0.052 0.531,0.25 0.458,0.198 10 false *A 0.104,1.385 0.563,1.583 0.458,0.198 10 false *B

w/o Climate Control Seat System

w/ Climate Control Seat System

Check air conditioning amplifier assembly.

Disconnect the G46 air conditioning amplifier assembly connector.

ii.

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

Standard:

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
G46-5 (B) - Body ground	Power source	Always	11 to 14 V
G46-6 (IG+) - Body ground	Power source (IG)	Ignition switch ON	11 to 14 V
G46-6 (IG+) - Body ground	Power source (IG)	Ignition switch off	Below 1 V
G46-17 (GND) - Body ground	Ground	Always	Below 1 Ω

iii.

Reconnect the G46 air conditioning amplifier assembly connector.

iv.

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

Standard:

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
G46-1 (CANL)	CAN communication signal	-	-
G46-2 (CANH)	CAN communication signal	-	-
G46-7 (LIN1) - Body ground	LIN communication signal	Ignition switch ON	Waveform generation (waveform 1)
G46-11 (ECOS) - Body ground	ECO switch input signal	· Ignition switch ON · Integration control and panel assembly (ECO switch): OFF → ON	11 to 14 V → Below 1 V
G46-18 (SOL+) - Body ground	Compressor solenoid operation signal	· Engine running · Blower switch: LO · A/C switch: On	Pulse generation (See waveform 4)
G46-21 (BLW) - Body ground	Blower operation signal	· Ignition switch ON · Blower switch: LO	Waveform generation (waveform 2)
G47-1 (TAM) - G47-14 (SG-2)	Ambient temperature sensor signal	· Ignition switch ON · Ambient temperature 25°C (77°F)	1.05 to 1.45 V
G47-1 (TAM) - G47-14 (SG-2)	Ambient temperature sensor signal	· Ignition switch ON · Ambient temperature 40°C (104°F)	0.64 to 0.87 V
G47-3 (SG-1) - Body ground	Room temperature sensor ground	Always	Below 1 Ω
G47-5 (TR) - Body ground	Room temperature sensor signal	· Ignition switch ON · Cabin temperature 25°C (77°F)	1.05 to 1.45 V
G47-5 (TR) - Body ground	Room temperature sensor signal	· Ignition switch ON · Cabin temperature 40°C (104°F)	0.64 to 0.87 V
G47-6 (PRE) - G46-15 (SG-4)	Air conditioning pressure sensor signal	· Engine running · Air conditioning system operating · Refrigerant pressure: Normal pressure (below 3025 kPa (30.8 kgf/cm², 439 psi) and higher than 176 kPa (1.8 kgf/cm², 26 psi)) (for HFC-134a(R134a)) · Refrigerant pressure: Normal pressure (below 2812 kPa (28.7 kgf/cm², 408 psi) and higher than 196 kPa (2.0 kgf/cm², 28 psi)) (for HFO-1234y(R1234yf))	0.74 to 4.61 V
		· Engine running · Air conditioning system operating · Refrigerant pressure: Abnormal pressure (less than 176 kPa (1.8 kgf/cm², 26 psi)) (for HFC-134a(R134a)) · Refrigerant pressure: Abnormal pressure (less than 196 kPa (2.0 kgf/cm², 28 psi)) (for HFO-1234y(R1234yf))	Below 0.74 V
		· Engine running · Air conditioning system operating · Refrigerant pressure: Abnormal pressure (more than 3025 kPa (30.8 kgf/cm², 439 psi)) (for HFC-134a(R134a)) · Refrigerant pressure: Abnormal pressure (more than 196 kPa (2.0 kgf/cm², 28 psi)) (for HFO-1234y(R1234yf))	4.61 V or higher
G47-11 (S5-3) - Body ground	Air conditioning pressure sensor power source	Ignition switch off → Ignition switch ON	Below 1 V → 4.75 to 5.25 V
G47-14 (SG-2) - Body ground	Ambient temperature sensor ground	Always	Below 1 Ω
G47-15 (SG-4) - Body ground	Air conditioning pressure sensor ground	Always	Below 1 Ω
z11-2 (BUS G) - Body ground	BUS IC ground	Always	Below 1 Ω
z11-3 (BUS) - z11-2 (BUS G)	BUS IC operation signal	Ignition switch ON	Waveform generation (waveform 3)
z11-4 (B BUS) - z11-2 (BUS G)	BUS IC power source	Ignition switch off	11 to 14 V
z11-5 (SGA) - Body ground	No. 1 cooler thermistor sensor ground	Always	Below 1 Ω
z11-6 (TEA) - z11-5 (SGA)	No. 1 cooler thermistor signal	· Ignition switch ON · No. 1 cooler thermistor ambient temperature 0°C (32°F)	1.7 to 2.1 V
z11-6 (TEA) - z11-5 (SGA)	No. 1 cooler thermistor signal	· Ignition switch ON · No. 1 cooler thermistor ambient temperature 15°C (59°F)	0.9 to 1.3 V

0.365,1.563 0.823,1.76 0.458,0.198 10 false GND

Waveform 1:

Item	Content
Terminal No.	G46-7 (LIN1) - Body ground
Tool Setting	2 V/DIV., 20 μs./DIV.
Vehicle Condition	Ignition switch ON

2.792,1.656 3.135,1.865 0.344,0.208 10 false GND

Waveform 2:

Item	Content
Terminal No.	G46-21 (BLW) - Body ground
Tool Setting	1 V/DIV., 500 μs./DIV.
Vehicle Condition	· Ignition switch ON · Blower switch: LO

HINT:: The waveform varies with the blower speed.

0.333,1.469 0.75,1.646 0.417,0.177 10 GND

Waveform 3:

Item	Content
Terminal No.	z11-3 (BUS) - z11-2 (BUS G)
Tool Setting	2 V/DIV., 20 μs./DIV.
Vehicle Condition	Ignition switch ON

2.979,1.271 3.354,1.438 0.375,0.167 10 false GND

Waveform 4:

Item	Content
Terminal No.	G46-18 (SOL+) - Body ground
Tool Setting	5 V/DIV., 500 μs./DIV.
Vehicle Condition	· Engine running · Blower switch: LO · A/C switch: On

AIR CONDITIONING CONTROL ASSEMBLY

3.354,0.167 3.854,0.417 0.5,0.25 3.469,0.208 3.927,0.406 0.458,0.198 10 false G24

Disconnect the G24 air conditioning control assembly connector.

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

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
G24-9 (IG+) - Body ground	Power source (IG)	Ignition switch off	Below 1 V
G24-9 (IG+) - Body ground	Power source (IG)	Ignition switch ON	10.5 to 16 V
G24-13 (GND) - Body ground	Ground	Always	Below 1 Ω

Reconnect the G24 air conditioning control assembly connector.

Check for waveform according to the value(s) in the table below.

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
G24-7 (LIN1) - Body ground	LIN communication signal	Ignition switch ON	Waveform generation (Waveform 1)

0.292,1.552 0.75,1.75 0.458,0.198 10 false GND

Waveform 1:

Item	Content
Terminal No.	G24-7 (LIN1) - Body ground
Tool Setting	2 V/DIV., 20 μs./DIV.
Vehicle Condition	Ignition switch ON