CHECK AT A/C-ECU TERMINALS




Terminal No.
 Terminal code
 Check item
 Check condition
 Normal condition
1
 CANL
 CANC-L
 -
 -
2
 CANH
 CANC-H
 -
 -
3
 SENG
 Sensor earth
 Always
 1 V or less
4
 BASE
 Power transistor (GATE)
 Air volume control dial: Maximum air volume
 System voltage
5
 P/TC
 Power transistor (DRAIN)
 Air volume control dial: Maximum air volume
 0 to 2 V
6 - 7
 -
 -
 -
 -
8
 INC
 Interior temperature sensor
 Sensor probe temperature: 25°C (2.2 kΩ)
 2.2 to 2.7 V
9
 HTR
 -
 -
 -
10
 A/C
 A/C for engine
 A/C ON
 1.2 V or less
11
 -
 -
 -
 -
12
 MD4
 Mode selection damper control motor
 -
 -
13
 MD2
14
 MD3
15
 MD1
16
 FR4
 Outside/inside damper control motor
 -
 5 V
17
 E
 Earth
 Always
 1 V or less
18
 B/UP
 Battery power supply
 Always
 System voltage
19
 IG1
 IG power supply
 Ignition switch: ON
 System voltage
20
 A/C+B
 STEP-M supply
 Always
 System voltage
21
 ILL+
 Illuminations
 -
 -
22
 AM1P
 Air mixing damper control motor (Front passenger’s side) <Vehicles with dual-zone auto A/C>
 -
 -
23
 AM3P
24
 AM2P
25
 AM4P
26
 AM1
 Air mixing damper control motor
 -
 -
27
 AM3
28
 AM2
29
 AM4
30
 FR1
 Outside/inside damper control motor
 -
 -
31
 FR3
32
 FR2