Hyundai Ioniq (AE): Hybrid Control System / HCU (Hybrid Control Unit). Schematic diagrams

Hyundai Ioniq (AE) 2017-2022 Service & Repair Manual / Hybrid Control System / Hybrid Control System / HCU (Hybrid Control Unit). Schematic diagrams

HCU Terminal and Input / Output Signal

Terminal Function
Connector [C133-S]
Pin No
Description
Connected to
1
HCU Ground
Chassis ground
2
HCU Ground
Chassis ground
3
HCU Ground
Chassis ground
4
Battery power (B+)
Battery
5
Battery power (B+)
Battery
6
Battery power (B+)
Battery
7
-
　
8
-
　
9
-
　
10
-
　
11
-
　
12
-
　
13
-
　
14
-
　
15
Brake Switch 2 signal input
Brake Switch (NC, IG1)
16
Brake Switch 1 signal input
Brake Switch (NO, B+)
17
-
　
18
-
　
19
-
　
20
-
　
21
-
　
22
-
　
23
-
　
24
-
　
25
-
　
26
-
　
27
-
　
28
-
　
29
-
　
30
-
　
31
-

32
-

33
-

34
-
　
35
-
　
36
-
　
37
-
　
38
Start signal input
Smart Key Unit
39
-
　
40
-
　
41
-
　
42
-
　
43
-
　
44
-
　
45
-
　
46
-
　
47
-
　
48
-
　
49
-
　
50
-
　
51
-
　
52
-
　
53
-
　
54
-
　
55
-
　
56
-
　
57
-
　
58
-
　
59
-
　
60
-
　
61
-
　
62
-
　
63
-
　
64
-
　
65
-
　
66
-
　
67
-
　
68
-
　
69
-
　
70
-
　
71
-
　
72
-
　
73
IGN signal input
Smart Key Unit
74
-
　
75
-
　
76
-
　
77
-
　
78
Powertrain CAN [High] signal input
Other control modules
79
Powertrain CAN [Low] signal input
Other control modules
80
-
　
81
Hybrid CAN [High] signal input
Other control modules
82
Hybrid CAN [Low] signal input
Other control modules
83
-
　
84
-
　
85
-
　
86
-
　
87
-
　
88
-
　
89
-
　
90
-
　
91
-
　
92
-
　
93
-
　
94
-
　

Input/Output signal
Connector [C133-S]
Pin no
Description
Condition
Type
Level
1
HCU Ground
Always
DC Voltage
Max. 50 mV
2
HCU Ground
Always
DC Voltage
Max. 50 mV
3
HCU Ground
Always
DC Voltage
Max. 50 mV
4
Battery power (B+)
Always
DC Voltage
Battery Voltage
5
Battery power (B+)
Always
DC Voltage
Battery Voltage
6
Battery power (B+)
Always
DC Voltage
Battery Voltage
7
-
　
　
　
8
-
　
　
　
9
-
　
　
　
10
-
　
　
　
11
-
　
　
　
12
-
　
　
　
13
-
　
　
　
14
-
　
　
　
15
Brake Switch 2 signal input
IG ON
DC Voltage
Battery Voltage
16
Brake Switch 1 signal input
Always
DC Voltage
Battery Voltage
17
-
　
　
　
18
-
　
　
　
19
-
　
　
　
20
-
　
　
　
21
-
　
　
　
22
-
　
　
　
23
-
　
　
　
24
-
　
　
　
25
-
　
　
　
26
-
　
　
　
27
-
　
　
　
28
-
　
　
　
29
-
　
　
　
30
-
　
　
　
31
-



32
-



33
-



34
-
　
　
　
35
-
　
　
　
36
-
　
　
　
37
-
　
　
　
38
Start signal input
IG ST
DC Voltage
Battery Voltage
39
-
　
　
　
40
-
　
　
　
41
-
　
　
　
42
-
　
　
　
43
-
　
　
　
44
-
　
　
　
45
-
　
　
　
46
-
　
　
　
47
-
　
　
　
48
-
　
　
　
49
-
　
　
　
50
-
　
　
　
51
-
　
　
　
52
-
　
　
　
53
-
　
　
　
54
-
　
　
　
55
-
　
　
　
56
-
　
　
　
57
-
　
　
　
58
-
　
　
　
59
-
　
　
　
60
-
　
　
　
61
-
　
　
　
62
-
　
　
　
63
-
　
　
　
64
-
　
　
　
65
-
　
　
　
66
-
　
　
　
67
-
　
　
　
68
-
　
　
　
69
-
　
　
　
70
-
　
　
　
71
-
　
　
　
72
-
　
　
　
73
IGN Signal input
IG ON
DC Voltage
Battery Voltage
74
-
　
　
　
75
-
　
　
　
76
-
　
　
　
77
-
　
　
　
78
Powertrain CAN [High] signal input
IG ON
Pulse
Dominant : 2.75 - 4.5 (3.5)V
Receive : 2.0 - 3.0 (2.5)V
79
Powertrain CAN [Low] signal input
IG ON
Pulse
Receive : 2.0 - 3.0 (2.5)V
Dominant : 0.5 - 2.25 (1.5)V
80
-
　
　
　
81
Hybrid CAN [High] signal input
IG ON
Pulse
Dominant : 2.75 - 4.5 (3.5)V
Receive : 2.0 - 3.0 (2.5)V
82
Hybrid CAN [Low] signal input
IG ON
Pulse
Receive : 2.0 - 3.0 (2.5)V
Dominant : 0.5 - 2.25 (1.5)V
83
-
　
　
　
84
-
　
　
　
85
-
　
　
　
86
-
　
　
　
87
-
　
　
　
88
-
　
　
　
89
-
　
　
　
90
-
　
　
　
91
-
　
　
　
92
-
　
　
　
93
-
　
　
　
94
-
　
　
　

Circuit Diagram

    Removal    â€¢ Be sure to read and follow the "General Safety Information and Caution" before doing any work related with the high voltage system.

    Removal    â€¢ Be sure to read and follow the "General Safety Information and Caution" before doing any work related with the high voltage system.

    Other information:

    Hyundai Ioniq (AE) 2017-2022 Service & Repair Manual: Evaporator Temperature Sensor. Description and operation

    DescriptionThe evaporator temperature sensor will detect the evaporator core temperature and interrupt compressor relay power in order to prevent evaporator from freezing by excessive cooling. The evaporator temperature sensor has the Negative Temperature Coefficient (NTC).

    Hyundai Ioniq (AE) 2017-2022 Service & Repair Manual: Evaporator Temperature Sensor. Repair procedures

    Inspection1.Turn the ignition switch OFF.2.Disconnect the evaporator temperature sensor connector.3.Measure the resistance between terminal "+" and "-" of the evaporator temperature sensor.Specification Evaporator core temperature [°C (°F)] Resistance [KΩ]

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