Terminals Of Ecu

CHECK AIR CONDITIONING AMPLIFIER

Fig 1: Identifying Air Conditioning Amplifier Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the voltage of the connectors.

HINT:

Check from the rear of the connector while it is connected to the air conditioning amplifier.

AIR CONDITIONING AMPLIFIER CONNECTOR TERMINALS REFERENCE CHART

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
D37-1 (IG+) - D37-14 (GND)	GR - W-B	Power source (IG)	Ignition switch on (IG)	11 to 14 V
D37-2 (SOL+) - D37-14 (GND)	L-W-B	Air conditioning compressor operation signal	Engine idling	Pulse generation (see waveform 1 b)
			Blower switch LO
			Air Conditioning switch ON
D37-3 (PTC1) - Body ground (*1)	P - Body ground	PTC NO. 1 heater relay operation signal	Engine idling	Below 1 V → 11 to 14 V
			Set temperature: MAX HOT
			Engine coolant temperature: Below 65°C (149°F)
			Ambient temperature: Below 10°C(50°F)
			Blower switch OFF → LO
D37-4 (PTC3) - Body ground (*1)	W - Body ground	PTC NO. 3 heater relay operation signal	Engine idling	Below 1 V → 11 to 14 V
			Set temperature: MAX HOT
			Engine coolant temperature: Below 65°C (149°F)
			Ambient temperature: Below 10°C(50°F)
			Blower switch OFF → LO
D37-5 (TAM) - D37-14 (GND)	B-W-B	Ambient temperature sensor signal	Ignition switch on (IG)	1.8 to 2.2 V
D37-5 (TAM) - D37-14 (GND)	B-W-B	Ambient temperature sensor signal	Ambient temperature: 25°C (77°F)	1.8 to 2.2 V
D37-8 (LOCK) - D37-14 (GND)	V-W-B	Air compressor lock sensor signal	Engine idling	Pulse generation (see waveform 5 f)
			Air Conditioning switch ON
			Blower switch LO
D37-9 (PRE) - D37-13 (SG-2)	R-SB	Air conditioning pressure sensor signal	Refrigerant pressure: Normal	0.76 to 4.74 V
D37-9 (PRE) - D37-13 (SG-2)	R-SB	Air conditioning pressure sensor signal	Refrigerant pressure: Abnormal (less than 0.196 MPa [2.0 kgf/cm² , 28 psi])	0.5 to 4.83 V
D37-9 (PRE) - D37-13 (SG-2)	R-SB	Air conditioning pressure sensor signal	Refrigerant pressure: Abnormal (more than 3.03 MPa [32 kgf/cm² , 455 psi])	4.74 V or higher
D37-10 (S5-3) - D37-14 (GND)	O-W-B	Power supply for pressure sensor	Ignition switch on (IG)	4.5 to 5.5 V
D37-11 (CANH) - D37-14 (GND)	LG - W-B	Hi-level CAN bus line	Ignition switch on (IG)	Pulse generation (see waveform 3 d)
D37-12 (CANL) - D37-14 (GND)	W-W-B	Lo-level CAN bus line	Ignition switch on (IG)	Pulse generation (see waveform 4 e)
D37-13 (SG-2) - Body ground	SB - Body ground	Ground for pressure sensor	Always	Below 1 V
D37-14 (GND) - Body ground	W-B - Body ground	Ground for main power supply	Always	Below 1 V
D37-20 (MGC) - D37-14 (GND)	V-W-B	Air conditioning compressor magnetic clutch operation signal	Engine idling	Below 1 V
			Blower switch LO
			Air Conditioning switch ON
D37-21 (B) - D37-14 (GND)	LG - W-B	Power source (Back-up)	Always	11 to 14 V
D37-22 (PTC2) - Body ground (*1)	G - Body ground	PTC NO. 2 heater relay operation signal	Engine idling	Below 1 V → 11 to 14 V
			Set temperature: MAX HOT
			Engine coolant temperature: Below 65°C (149°F)
			Ambient temperature: Below 10°C (50°F)
			Blower switch OFF → LO
D37-23 (BLW) - D37-14 (GND)	R-W-B	Blower motor control signal	Ignition switch on (IG)	Pulse generation (see waveform 2 c)
D37-23 (BLW) - D37-14 (GND)	R-W-B	Blower motor control signal	Blower switch LO	Pulse generation (see waveform 2 c)
D37-25 (ALT) - Body ground (*1)	SB - Body ground	Generator signal	Engine idling	Pulse generation
D37-29 (TR) - D37-35 (SG-4)	BR-LG	Room temperature sensor signal (for Front)	Ignition switch on (IG)	1.8 to 2.2 V
D37-29 (TR) - D37-35 (SG-4)	BR-LG	Room temperature sensor signal (for Front)	Vehicle interior temperature: 25°C (77°F)	1.8 to 2.2 V
D37-32 (TSP) - D37-14 (GND)	Y-W-B	Front passenger side solar sensor signal	Ignition switch on (IG)	0.8 to 4.3 V
D37-32 (TSP) - D37-14 (GND)	Y-W-B	Front passenger side solar sensor signal	Solar sensor subject to electric light	0.8 to 4.3 V
D37-33 (TSD) - D37-14 (GND)	O-W-B	Driver side solar sensor signal	Ignition switch on (IG)	0.8 to 4.3 V
D37-33 (TSD) - D37-14 (GND)	O-W-B	Driver side solar sensor signal	Solar sensor subject to electric light	0.8 to 4.3 V
D37-35 (SG-4) - Body ground	LG - Body ground	Ground for room temperature sensor (for Front)	Always	Below 1 V
D37-37 (LIN1) - D37-14 (GND)	R-W-B	LIN communication signal	Ignition switch on (IG)	Pulse generation
D37-38 (RDEF) - D37-14 (GND)	W-W-B	Rear defogger switch signal	Ignition switch on (IG) Rear defogger switch OFF	11 to 14 V
D37-38 (RDEF) - D37-14 (GND)	W-W-B	Rear defogger switch signal	Ignition switch on (IG) Rear defogger switch ON	Below 1 V
D38-1 (RBUS) - D38-21 (RBUG) (*2)	R-V	BUS IC control signal (for Rear)	Ignition switch on (IG)	Pulse generation
D38-4 (TEC) - D38-19 (SGND) (*2)	B-GR	Evaporator temperature sensor signal (for Rear)	Ignition switch on (IG)	1.4 to 1.8 V
D38-4 (TEC) - D38-19 (SGND) (*2)	B-GR	Evaporator temperature sensor signal (for Rear)	Evaporator temperature: 15°C(59°F)	1.4 to 1.8 V
D38-7 (SG-6) - Body ground (*3)	W - Body ground	Ground for room temperature sensor signal (for Rear)	Always	Below 1 V
D38-13 (RLIN) - D38-20 (GND2) (*2)	B-SB	LIN communication signal (for Rear)	Ignition switch on (IG)	Pulse generation
D38-17 (TR) - D38-7 (SG-6) (*3)	BR-W	Room temperature sensor signal (for Rear)	Ignition switch on (IG)	1.8 to 2.2 V
D38-17 (TR) - D38-7 (SG-6) (*3)	BR-W	Room temperature sensor signal (for Rear)	Vehicle interior temperature: 25°C (77°F)	1.8 to 2.2 V
D38-19 (SGND) - Body ground (*2)	GR - Body ground	Ground for evaporator temperature sensor signal (for Rear)	Always	Below 1 V
D38-20 (GND2) - Body ground (*2)	SB - Body ground	Ground for power supply	Always	Below 1 V
D38-21 (RBUG) - Body ground (*2)	V - Body ground	Ground for BUS IC (for Rear)	Always	Below 1 V
D38-22 (BLWH) - D38-20 (GND2) (*2)	G-SB	Blower motor control signal (for Rear)	Ignition switch on (IG)	Pulse generation
D38-22 (BLWH) - D38-20 (GND2) (*2)	G-SB	Blower motor control signal (for Rear)	Blower switch LO	Pulse generation
D38-23 (RBBU) - D38-21 (RBUG) (*2)	Y-V	Power supply for BUS IC (for Rear)	Ignition switch on (IG)	11 to 14 V
D38-24 (+B2) - D38-20 (GND2) (*2)	LG-SB	Power source (Back-up) (for Rear)	Always	11 to 14 V
Z17-2 (BUS G) - Body ground	-	Ground for BUS IC	Always	Below 1 V
z17-3 (BUS) - z17-2 (BUS G)	-	BUS IC control signal	Ignition switch on (IG)	Pulse generation
z17-4 (BBUS) - z17-2 (BUS G)	-	Power supply for BUS IC	Ignition switch on (IG)	11 to 14 V
z17-5 (SGA) - Body ground	-	Ground for evaporator temperature sensor	Always	Below 1 V
z17-6 (TEA) - z17-5 (SGA)	-	Evaporator temperature sensor signal (for Front)	Ignition switch on (IG)	1.4 to 1.8V
z17-6 (TEA) - z17-5 (SGA)	-	Evaporator temperature sensor signal (for Front)	Evaporator temperature: 15°C(59°F)	1.4 to 1.8V

Using an oscilloscope, check waveform 1.

Compressor and magnetic clutch operation signal

WAVEFORM REFERENCE CHART

Item	Content
Tester Connection	D37-2 (SOL+) - D37-14 (GND)
Tool Setting	5V/DIV., 500 μsec./DIV.
Condition	Engine idling, Blower switch LO, air conditioning switch ON

Fig 2: Waveform 1 Graph

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Using an oscilloscope, check waveform 2.

Blower motor control signal

WAVEFORM REFERENCE CHART

Item	Content
Tester Connection	D37-23 (BLW) - D37-14 (GND)
Tool Setting	1 V/DIV., 500 μsec/DIV.
Condition	Ignition switch on (IG), Blower switch LO

Fig 3: Waveform 2 Graph

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

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

Using an oscilloscope, check waveform 3.

CAN communication signal

WAVEFORM REFERENCE CHART

Item	Content
Tester Connection	D37-11 (CANH) - D37-14 (GND)
Tool Setting	1 V/DIV., 10 μsec./DIV.
Condition	Ignition switch on (IG)

HINT:

The waveform varies depending on the CAN communication signal.

Fig 4: Waveform 3 Graph

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Using an oscilloscope, check waveform 4.

CAN communication signal

WAVEFORM REFERENCE CHART

Item	Content
Tester Connection	D37-12 (CANL) - D37-14 (GND)
Tool Setting	1 V/DIV., 10 μsec./DIV.
Condition	Ignition switch on (IG)

HINT:

The waveform varies depending on the CAN communication signal.

Fig 5: Waveform 4 Graph

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Using an oscilloscope, check waveform 5.

Air Conditioning compressor lock sensor signal

WAVEFORM REFERENCE CHART

Item	Content
Tester Connection	D37-8 (LOCK) - D37-14 (GND)
Tool Setting	200 mV/DIV., 10 ms./DIV.
Condition	Engine is running Blower switch: LO Air conditioning switch: ON

Fig 6: Waveform 5 Graph

HINT:

The waveform varies depending on the engine speed.

*1:w/ PTC Heater

*2: for Rear Air Conditioning

*3: for Rear Automatic Air Conditioning

CHECK FRONT AIR CONDITIONING CONTROL

Fig 7: Identifying Front Air Conditioning Control Connector Terminals

Measure the voltage of the connectors.

FRONT AIR CONDITIONING CONTROL CONNECTOR TERMINALS REFERENCE CHART

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
E10-2 (IG+) - E10-10 (GND)	V-GR	Power source (IG)	Ignition switch on (IG)	11 to 14 V
E10-5 (LIN1) - E10-10 (GND)	R-GR	LIN communication signal	Ignition switch on (IG)	Pulse generation
E10-10 (GND) - Body ground	GR - Body ground	Ground for front air conditioning control	Always	Below 1 V

CHECK REAR AIR CONDITIONING CONTROL (for Rear Air Conditioning)

Fig 8: Identifying Rear Air Conditioning Control Connector Terminals

Measure the voltage of the connectors.

REAR AIR CONDITIONING CONTROL CONNECTOR TERMINALS REFERENCE CHART

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
R1-2 (IG+) - R1-10 (E)	V-W-B	Power source (IG)	Ignition switch on (IG)	11 to 14 V
R1-5 (MPX-) - R1-10 (E)	B-W-B	LIN communication signal	Ignition switch on (IG)	Pulse generation
R1-10 (E) - Body ground	W-B - Body ground	Ground for rear air conditioning control	Always	Below 1 V