Hyundai Elantra: Controller / Heater Control Unit
Components and components location


[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
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. |
|
|
Other information:
Repair procedures
Inspection
•
Wrap tin foil around the end of the voltmeter test lead to prevent damaging the heater line. Apply finger pressure on the tin foil, moving the tin foil along the grid line to check for open circuits.1.Turn on the defogger switch and use a voltmeter to measure the voltage of each heater line at the glass center point. If a..
Schematic diagrams
Components
Repair procedures
RemovalRoof Antenna1.Disconnect the negative (-) battery terminal.2.Remove the roof trim.(Refer to Body - "Roof Trim Assembly")3.Disconnect the roof antenna connector (A).4.Remove the roof antenna (A) after loosening a nut (B).Crash Pad Antenna1.Disconnect the negative (-) battery terminal.2.Remove the main crash pad assembly.(Refer to Bo..