CHECK AT A/C-ECU TERMINALS




Terminal No.
 Check items
 Check conditions
 Normal conditions
1
 Sensor earth
 Always
 0 V
2
 Front power transistor (DRAIN)
 Air volume control dial: Maximum air volume (Preset temperature 18°C)
 0 - 2 V
3
 Front power transistor (GATE)
 Air volume control dial: Maximum air volume (Preset temperature 18°C)
 System voltage
4
 Back-up power supply
 Always
 System voltage
5
 ACC power supply
 Ignition switch: ACC
 System voltage
6
 IG2 power supply
 Ignition switch: IG2
 System voltage
7
 Earth
 Always
 0 V
8~10
 -
 -
 -
11
 Compressor relay input
 Compressor relay: ON
 System voltage
12
 Rear window defogger relay
 Rear window defogger relay : ON
 0 - 1 V
13
 PTC heater switch indicator <Vehicles with rear heater or dual automatic A/C>
 PTC heater switch: ON
 0 - 1 V
PTC switch: OFF
 0 V
14
 Sensor power supply:
 Ignition switch: IG2
 5 V
15
 Rear temperature control lever <Vehicles with dual automatic A/C>
 Rear temperature control lever MAX HOT position
 0 V
16, 17
 -
 -
 -
18
 Interior temperature sensor
 Sensor probe temperature: 25°C (4kΩ)
 2.1 - 2.7 V
19
 Air thermo sensor
 Sensor probe temperature: 25°C (4kΩ)
 2.1 - 2.7 V
20
 Front air mix damper motor (Potentiometer input)
 Front air mix damper motor MAX HOT position
 1.2 - 1.6 V
21
 Air outlet changeover damper motor (Potentiometer input)
 DEF position
 0.5 - 0.8 V
22
 Rear air mix damper motor (Potentiometer input) <Vehicles with dual automatic A/C>
 Rear air mix damper motor MAX HOT position
 0.8 - 1.2 V
23
 Solar sensor input
 Brightness 0 lux
 5 V
Brightness 100000 lux or more
 0 V
24
 Ambient temperature sensor
 Sensor probe temperature 25°C (1.5k Ω)
 2.1 - 2.7 V
25
 A/C pressure sensor input
 Refer to
Refer to
26
 Heat switch <Vehicles with dual automatic A/C>
 Ignition switch: IG2
Heater switch ON
 System voltage
31
 Front air mix damper motor (COOL)
 When the front air conditioner is moved to the COOL position
System voltage
When the front air conditioner is moved to the HOT position
0 - 1 V
32
 Front air mix damper motor (HOT)
 When the front air conditioner is moved to the HOT position
System voltage
When the front air conditioner is moved to the COOL position
0 - 1 V
33
 Air outlet changeover damper motor (FACE)
 When moving toward FACE position
System voltage
When moving toward DEF position
0 - 1 V
34
 Air outlet changeover damper motor (DEF)
 When moving toward DEF position
System voltage
When moving toward FACE position
0 - 1 V
35
 Rear air mix damper motor (COOL) <Vehicles with dual automatic A/C>
 When the rear air conditioner is moved to the COOL position
System voltage
When the rear air conditioner is moved to the HOT position
0 - 1 V
36
 Rear air mix damper motor (HOT) <Vehicles with dual automatic A/C>
 When the rear air conditioner is moved to the HOT position
System voltage
When the rear air conditioner is moved to the COOL position
0 - 1 V
37
 Outside/inside air selection damper motor (Fresh air position)
 When setting the Fresh air position
 0 - 1 V
When setting the air recirculation position
 System voltage
38
 Outside/inside air selection damper motor (Air recirculation position)
 When moving to air recirculation position
0 - 1 V
When moving to fresh air position
System voltage
35~42
 -
 -
 -
43
 ILL power supply
 Lighting switch: ON
 System voltage
44
 ILL earth
 Always
 0 V
45
 Front blower relay
 Ignition switch: IG2
 0 - 1 V
46
 PTC heater relay <Vehicles with dual automatic A/C>
 PTC heater : ON
0 - 1 V
PTC heater : OFF
System voltage
51
 Rear temperature control lever indicator <Vehicles with dual automatic A/C>
 Rear air volume adjusting switch : OFF
 System voltage
Rear air volume adjusting switch : Other than OFF
 0 - 1 V
52
 Rear air conditioner switch indicator (AUTO) <Vehicles with dual automatic A/C>
 Rear air volume adjusting switch : AUTO
 0 - 1 V
53
 Rear air conditioner switch indicator (Lo) <Vehicles with rear heater, rear cooler or dual automatic A/C>
 Rear air volume adjusting switch : 1
 0 - 1 V
54
 Rear air conditioner switch indicator (Me) <Vehicles with rear heater, rear cooler or dual automatic A/C>
 Rear air volume adjusting switch : 2
 0 - 1 V
55
 Rear air conditioner switch indicator (Hi) <Vehicles with rear heater, rear cooler or dual automatic A/C>
 Rear air volume adjusting switch : 3
 0 - 1 V
56
 Rear blower relay
 Ignition switch: ON
0 - 1 V
57
 -
 -
 -
58
 Rear fan switch indicator <Vehicles with rear heater, rear cooler or dual automatic A/C>
 Rear fan switch: Other than OFF
 0 V
59
 Rear power transistor (DRAIN)
 Rear air volume adjusting switch : 3 (Preset temperature 20°C)
 0 - 2 V
60
 Rear power transistor (GATE)
 Rear air volume adjusting switch : 3 (Preset temperature 20°C)
 System voltage
61-64
 -
 -
 -
65
 Rear air conditioner switch (Shielded wire) <Vehicles with rear heater, rear cooler or dual automatic A/C>
 Always
 0 V
66
 Rear air conditioner switch (Hi) <Vehicles with rear heater, rear cooler or dual automatic A/C>
 Rear air volume adjusting switch : 3
 Approximately 5 V
67
 Rear air conditioner switch (Me) <Vehicles with rear heater, rear cooler or dual automatic A/C>
 Rear air volume adjusting switch : 2
 Approximately 5 V
68
 Rear air conditioner switch (Lo) <Vehicles with rear heater, rear cooler or dual automatic A/C>
 Rear air volume adjusting switch : 1
 Approximately 5 V
69
 Rear air conditioner switch (AUTO) <Vehicles with dual automatic A/C>
 Rear air volume adjusting switch : AUTO
 Approximately 5 V
70
 Rear air conditioner switch (OFF) <Vehicles with rear heater, rear cooler or dual automatic A/C>
 Rear air volume adjusting switch : OFF
 Approximately 5 V
71
 Rear fan switch input
 Rear fan switch: ON (switch pushed)
Ignition switch: IG2
 System voltage
72
 Rear air conditioner switch indicator power supply
 Rear air volume adjusting switch : Other than OFF
 System voltage