Hyundai Elantra AD: Controller - Heating, Ventilation and Air Conditioning - Hyundai Elantra AD 2017-2020 Service ManualHyundai Elantra AD: Controller

Heater & A/C Control Unit (Manual) Components and Components Location

Components

Connector
 Pin NO
 Function
 Connector
 Pin NO
 Function
A
 1
 Low
 B
 18
 ILL- (RHEO)
2
 Common
 19
 Sensor ground
3
 Ground
 20
 Ground
4
 Middle Low
 21
 Battery (+)
5
 Middle High
 22
 ISG DC
6
 High
 23
 ISG B+
B
 1
 IGN2
 24
 ILL+ (TAIL)
2
 PAB IGN1
 25
 Sensor REF (+5V)
3
 HTD (Rear defog indicator)
 26
 EVAP sensor (+)
4
 Detent Out (-)
 27
 AMB sensor (+)
5
 PTC Relay 2
 28
 Mode control actuator (Feedback)
6
 PTC Relay 3
 29
 Temperature control actuator (Feedback)
7
 PTC on signal
 30
 Intake actuator (Feedback)
8
 PAB Off signal
 31
 Mode control actuator (Vent)
9
 SBR
 32
 Mode control actuator (Def)
10
 Rear SBR [LH]
 33
 Temperature control actuator (Cool)
11
 Rear SBR [Center]
 34
 Temperature control actuator (Warm)
12
 Rear SBR [RH]
 35
 Intake actuator (Fresh)
13
 ECV+
 36
 Intake actuator (Recirculation)
14
 ECV- (Ground)
 37
 C_CAN High
15
 Max blower on signal
 38
 C_CAN Low
16
 Rear defogging swich (On)
 39
 Blower common signal
17
 Hazard signal
 40
 Ground

Heater & A/C Control Unit (Manual) Repair procedures

Replacement
1. Disconnect the negative (-) battery terminal.
2. Remove the glove box upper cover assembly.

(Refer to Body - "Glove Box Upper Cover Assembly")

3. Loosen the mounting screws and remove the crash pad center lower cover [LH](A).
4. After loosening the mounting screws, remove the A/C & heater controller unit (A).
5. Disconnect the A/C & heater controller connectors (A) and hose (B).
6. To intall, 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

Connector
 Pin NO
 Function
 Connector
 Pin NO
 Function
A
 1
 Battery (+)
 A
 21
 IGN1
2
 IGN2
 22
 ILL+ (TAIL)
3
 ISG B+
 23
 Sensor ground REF (+5V)
4
 Mode control actuator (Vent)
 24
 C_CAN High
5
 Mode control actuator (Def)
 25
 C_CAN Low
6
 Mode control actuator (Feedback)
 26
 HTD (Rear defog indicator)
7
 Intake actuator (Fresh)
 27
 -
8
 Intake actuator (Recirculation)
 28
 -
9
 Intake actuator (Feedback)
 29
 Passenger's temperature control actuator (Cool)
10
 Defogging actuator (On)
 30
 Passenger's temperature control actuator (Warm)
11
 Defogging actuator (Off)
 31
 Passenger's temperature control actuator (Feedback)
12
 Defogging actuator (Feedback)
 32
 PTC Relay 2
13
 Rear defog switch
33
 PTC Relay 3
14
 Hazard switch
 34
 PTC on signal
15
 Driver's temperature control actuator (Cool)
 35
 Detent out (-)
16
 Driver'st emperature control actuator (Warm)
 36
 -
17
 Driver's temperature control actuator (Feedback)
 37
 ECV +
18
 -
 38
 ECV - (Ground)
19
 Sensor ground
 39
 ILL- (RHEO)
20
 Ground
 40
 Ground

Connector
 Pin NO
 Function
 Connector
 Pin NO
 Function
B
 1
 Blower motor (+)
 B
 9
 PAB IGN1
2
 FET Drain (Feedback)
 10
 Clean signal
3
 FET (Gate)
 11
 Ionizer diagnosis
4
 SBR
 12
 AMB sensor (+)
5
 Rear SBR (LH)
 13
 EVAP sensor (+)
6
 Rear SBR (Center)
 14
  Auto defogging sensor signal
7
 Rear SBR (RH)
 15
 Photo sensor (-)_LH
8
 PAB Off signal
 16
 Photo sensor (-)_RH

Heater & A/C Control Unit (DATC) 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 glove box upper cover assembly.

(Refer to Body - "Glove Box Upper Cover Assembly")

3. Loosen the mounting screws and remove the crash pad center lower cover [LH](A).
4. After loosening the mounting screws, remove the A/C & heater controller unit (A).
5. Disconnect the A/C & heater controller connectors (A) and hose (B).
6. To intall, reverse the removal procedure.
  
• Make sure the connector are connected in properly.
• Replace any damaged clips.
Blower
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