CHECK AT A/C-ECU TERMINALS


Terminal No.
 Check items
 Check conditions
 Normal conditions
1
 ILL power supply
 Lighting switch: ON
 System voltage
2
 ILL earth
 Always
 0 V
3 - 5
 -
 -
 -
6
 A/C compressor input
 A/C Compressor relay: ON
 System voltage
7
 -
 -
 -
8
 Sensor earth (front side)
 Always
 0 V
9
 Earth
 Always
 0 V
10
 -
 -
 -
11
 Power transistor output
 When the blower is operating
 0 - 3.5 V (alternative effective value)
12
 Engine-A/T-ECU <3800> or Engine-ECU <3200> output
 A/C low
 System voltage
13
 Engine-A/T-ECU <3800> or Engine-ECU <3200> output
 A/C: ON
 System voltage
14
 Engine-ECU <3200> output
 PTC heater: ON
 System voltage
15
 Rear window defogger relay
 Rear window defogger relay : ON
 0 - 1 V
16
 Front blower relay
 Ignition switch: ON
 0 - 1.5 V
17
 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
 0.5 V
18
 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
 0.5 V
19
 Back-up power supply
 Always
 System voltage
20
 IG2 power supply
 Ignition switch: ON
 System voltage
21
 -
 -
 -
22
 Mode selection damper control motor (Potentiometer input)
 DEF position
 0.7 - 1.3 V
23
 Front air mixing damper control motor (Potentiometer input)
 Front air mix damper motor MAX HOT position
 0.7 - 1.3 V
24
 A/C pressure sensor input
 Refer to
Refer to
25
 Heater water temperature sensor
 Sensor probe temperature: 25°C (5 kΩ)
 2.8 V
26
 Photo sensor input
 Brightness 0 lux
 5 V
Brightness 100000 lux or more
 0 V
27
 Air thermo sensor
 Sensor probe temperature: 25°C (1.5 kΩ)
 2.2 V
28
 Ambient air temperature sensor
 Sensor probe temperature 25°C (1.7 kΩ)
 1.9 V
29
 Interior temperature sensor
 Sensor probe temperature: 25°C (4 kΩ)
 2.1 - 2.7 V
30
 Sensor power supply (front side)
 Ignition switch: ON
 5 V
31
 Diagnosis code input
 -
 0 V
32
 -
 -
 -
33
 Outside/inside air selection damper motor (Air recirculation position)
 When setting the Fresh air position
 0.5 V
When setting the air recirculation position
 System voltage
34
 Outside/inside air selection damper motor (Fresh air position)
 When moving to air recirculation position
0.5 V
When moving to fresh air position
System voltage
35
 Air outlet changeover damper motor (FACE)
 When moving toward FACE position
System voltage
When moving toward DEF position
0.5 V
36
 Air outlet changeover damper motor (DEF)
 When moving toward DEF position
System voltage
When moving toward FACE position
0.5 V
41
 Sensor power supply (rear side) <Vehicles with dual A/C>
 Ignition switch: ON
 5 V
42
 Rear air mixing damper control motor (Potentiometer input) <Vehicles with dual A/C>
 Rear air mix damper motor MAX HOT position
 1 V
Rear air mix damper motor MAX COOL position
 4 V
43
 Sensor earth (rear side) <Vehicles with dual A/C>
 Always
 0 V
44
 Rear blower relay <Vehicles with dual A/C>
 Ignition switch: ON
 0 - 1 V
45
 Rear fan switch <Vehicles with dual A/C>
 Ignition switch: ON
Rear fan switch ON
 System voltage
46
 -
 -
 -
47
 Rear temperature adjustment dial
 Rear temperature adjustment dial : MAX HOT
 1 V
Rear temperature adjustment dial
 Rear temperature adjustment dial : MAX COOL
 4 V
48, 49
 Mode selection damper control motor
 Rear temperature adjustment dial : Halfway position
 1 - 12 V
50
 Rear mode selection damper control motor
 Ignition switch: ON
 1 - 12 V
51
 Rear air mix damper motor (HOT) <Dual 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
0.5 V
52
 Rear air mix damper motor (COOL) <Dual 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
0.5 V