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

Hyundai Ioniq (AE) 2017-2025 Service 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

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