Hyundai Elantra CN7: Controller - Heating, Ventilation and Air Conditioning - Hyundai Elantra CN7 2021-2025 Workshop ManualHyundai Elantra CN7: Controller

Heater & A/C Control Unit (Manual)

Components and components location
Components
[This illustration shows the LHD type. RHD type is symmetrical.]

[Connector A]
Pin No
Function
Pin No
Function
1
Low (Register specifications)
4
Middle Low (Register specifications)
2
Common (Register specifications)
5
Middle High (Register specifications)
3
Ground (Register specifications)
6
High (Register specifications)

[Connector B]
Pin No
Function
Pin No
Function
1
Battery (+)
21
IGN2
2
ISG B+
22
IGN1
3
ILL+ (TAIL)
23
Blower IS (PWM specifications)
4
Sensor REF (+5V)
24
-
5
Mode control actuator (Feedback)
25
-
6
Temperature control actuator (Feedback)
26
-
7
Intake actuator (Feedback)
27
Blower Max. On signal (Register specifications)
8
EVAP sensor (+)
28
-
9
AMB sensor (+)
29
PTC relay
10
Mode control actuator (Vent)
30
-
11
Mode control actuator (DEF)
31
-
12
Temperature control actuator (Cool)
32
-
13
Temperature control actuator (Warm)
33
P_CAN High
14
Intake actuator (FRE)
34
P_CAN Low
15
Intake actuator (REC)
35
Blower INH (PWM specifications)
16
HDT
36
Blower PWM (In) (PWM specifications)
17
-
37
ECV (+)
18
-
38
ECV (-)
19
Blower signal (On) (Register specifications)
39
Sensor ground
20
ILL- (RHEO)
40
Ground

Repair procedures
Replacement
1.
Disconnect the negative (-) battery terminal.
2.
Remove the crash pad lower panel.
(Refer to Body (Interior and Exterior) - "Crash Pad Lower Panel")
3.
Remove the steering column shroud upper panel (A).

4.
Remove the gear knob & boots (A) pull both of it up.

5.
Using a screwdriver or remover, remove the floor console side garnish (A).

6.
Remove the parking brake cover (A).

7.
Using a screwdriver or remover, remove the console upper cover (A).

8.
Using a screwdriver or remover, remove the crash pad garnish [CTR] (A).

9.
After loosening the mounting screws, remove the A/C & heater controller unit (A).

10.
Disconnect the A/C & heater controller connectors (A).

11.
To install, reverse the removal procedure.
   
•
Make sure the connector are connected in properly.
•
Replace any damaged clips (or pin-type retainers).

Heater & A/C Control Unit (DATC)

Components and components location
Components
[This illustration shows the LHD type. RHD type is symmetrical.]

[Connector A]
Pin No
Function
Pin No
Function
1
Battery
9
IGN2
2
ILL+ (TAIL)
10
ISG Battery (+)
3
-
11
IGN1
4
LIN BUS
12
HTD
5
-
13
-
6
-
14
-
7
-
15
-
8
RHEO (ILL-)
16
Ground

Repair procedures
Self Diagnosis
1.
Self-diagnosis process.

   
•
When operating the self-diagnostics, the below fault (self-diagnostics code) will blink at 0.5 seconds interval on the temperature display settings (driver's side only) and the remaining symbols are OFF .
2.
Fault code display
(1)
Continuance operation : DTC code.

(2)
Continuance operation : DTC code.

(3)
STEP operation.
A. Nomal or one fault code is same as a continuance operation.
B. DTC code.

3.
If fault codes are displayed during the check, Inspect malfunction causes by referring to fault codes.
Display
Fail description
0
Normal
11
Incar sensor OPEN
12
Incar sensor SHORT
13
Ambient sensor OPEN
14
Ambient sensor SHORT
17
Evaporator sensor OPEN
18
Evaporator sensor SHORT
19
Driver temp door potentionmeter OPEN or SHORT
20
Driver temp door potentionmeter Error
21
Mode door potentionmeter OPEN or SHORT
22
Mode door potentionmeter Error
23
Auto defog sensor OPEN
24
Auto defog sensor SHORT
25
Intake door potentionmeter OPEN or SHORT
26
Intake door potentionmeter Error
32
Passenger temp door potensionmeter OPEN or SHORT
33
Passenger temp door potention meter Error
45
APT CAN Signal Error
47
RPM CAN Signal Error
48
Vehicle speed CAN Signal Error
49
Engine coolant temprature CAN Signal Error
50
Cluster ionizer fault
71
ECV Fault (OPEN)

4.
Fail safe
No
Item
Fault
Fail Safe
1
Incar sensor
Open or Short
Control with the value of 25°C(77.0°F)
2
Amblent sensor
Open or Short
Control with the value of 20°C(67°F)
3
Evaporator sensor
Open or Short
Control with the value of -2°C(28.4°F)
4
Mode door potentiometer
Open or Short
Fix vent position, while selecting vent mode.
Fix defrost position, while selecting all except vent mode.
5
Temperature door potentiometer (MTC)
Open or Short
If temperature setting 1 - 7 step, fix at maximum cooling position.
If temperature setting 8 - 15 step, fix at maximum heating position.
6
Temperature door potentiometer (DATC)
Open or Short
If temperature setting 17°C(62.6°F) - 24.5°C(76.1°F), fix at maximum cooling position.
If temperature setting 25°C(77°F) - 32°C(89.6°F), fix at maximum heating position.
7
Intake door potentiometer
Open or Short
Fix vent position, while selecting vent mode.
Fix defrost position, while selecting all except vent mode.
8
Engine RPM
FFh or NO reception
A/C OFF (Control with the value of 650 rpm)
9
Vehicle speed
FFh or NO reception
A/C OFF
10
Engine coolant temperature
FFh or NO reception
Control with the value of - 2°C(28.4°F)
11
APS
FFh or NO reception
Control with the value of 5%
12
R-TQACNAPVC
(Max Torque limitation of A/C Compressor)
FFh or NO reception
A/C OFF (Control with the value of 0 Nm)
13
R-PACNC
(APT Sensor Output Value)
FFh or NO reception
A/C OFF (Control with the value of 0 Nm)
14
RLY-AC
(Activation of air conditioner compressor relay)
FFh or NO reception
FFh

Replacement
1.
Disconnect the negative (-) battery terminal.
2.
Remove the crash pad lower panel.
(Refer to Body (Interior and Exterior) - "Crash Pad Lower Panel")
3.
Remove the steering column shroud upper panel (A).

4.
Remove the gear knob & boots (A) pull both of it up.

5.
Using a screwdriver or remover, remove the floor console side garnish (A).

6.
Using a screwdriver or remover, remove the console upper cover (A).

7.
Press the lock pin, separate the console upper cover connector (A).

8.
Using a screwdriver or remover, remove the crash pad garnish [CTR] (A).

9.
After loosening the mounting screws, remove the A/C & heater controller unit (A).

10.
Disconnect the A/C & heater controller connector (A) and hose (B).

11.
To install, reverse the removal procedure.
   
•
Make sure the connector are connected in properly.
•
Replace any damaged clips.

Heater Control Unit

Components and components location
Component Location

1. Heater control unit


Components

[Connector A]
Pin No
Function
Pin No
Function
1
Mode control actuator (Feedback)
21
Mode control actuator (Vent)
2
Intake actuator (Feedback)
22
Mode control actuator (DEF)
3
Passenger's temperature control actuator
23
Intake actuator (FRE)
4
Driver's temperature control actuator
24
Intake actuator (REC)
5
DEF actuator feedback
25
Passenger's temperature control actuator (Cool)
6
Ionizer diagnosis
26
Passenger's temperature control actuator (Warm)
7
-
27
Driver's temperature control actuator (Cool)
8
Photo sensor (-) [LH]
28
Driver's temperature control actuator (Warm)
9
Photo sensor (-) [RH]
29
DEF actuator (Open)
10
-
30
DEF Driver's temperature control actuator (Coles)
11
Auto defoging sensor (SDA)
31
-
12
Auto defoging sensor (SCL)
32
-
13
Auto defoging sensor glass temperature
33
-
14
AMB sensor (+)
34
P_CAN Low
15
EVAP sensor (+)
35
P_CAN High
16
-
36
Clean signal
17
-
37
-
18
-
38
-
19
-
39
-
20
-
40
Ground

[Connector B]
Pin No
Function
Pin No
Function
1
Ground
13
Ground
2
Sensor ground
14
ECV (-) Ground
3
FET (Gate) (Power mosfet specifications)
15
ECV (+)
4
FET (Drain feedback) (Power mosfet specifications)
16
-
5
Blower motor (+) (Power mosfet specifications)
17
-
6
Blower INH (PWM specifications)
18
-
7
Blower IS (PWM specifications)
19
PTC relay (Gasoline PTC specifications)
8
Blower PWM IN (PWM specifications)
20
-
9
Sensor REF (+5V)
21
-
10
-
22
LIN BUS (PM Sensor)
11
-
23
IGN1
12
Battery
24
IGN2

Repair procedures
Replacement
1.
Disconnect the negative (-) battery terminal.
2.
Remove the glove box.
(Refer to Body (Interior and Exterior) - "Glove Box")
3.
Separate the heater control unit connector (A) and then loosen the mounitng screw, remove the heater control unit.

4.
To install, reverse the removal procedure.
   
•
Make sure the connector are connected in properly.
Blower
Blower Unit Components and components location Component Location1. Blower unit assemblyComponents1. Blower unit assebmly2. Blower upper cover [LH]3. Duct seal4. Blower upper cover [RH]5. Intake a ...