Hyundai Santa Fe (TM): Controller / Heater & A/C Control Unit (DATC). Repair procedures

Hyundai Santa Fe (TM) 2019-2023 Service and Repair Manual / Heating,Ventilation And Air Conditioning / Controller / 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.
Self diagnostic code
Display
Fail description
Remarks
0
 Normal
11
 Interior Temperature Sensor Disconnection (OPEN)
12
 Interior Temperature Sensor Short Circuit (SHORT)
13
 Ambient Temperature Sensor Disconnection (OPEN)
14
 Ambient Temperature Sensor Disconnection (SHORT)
17
 Evaporator Temperature Sensor Disconnection (OPEN)
18
 Evaporator Temperature Sensor Disconnection (SHORT)
19
 Driver Seat Temperature Control Actuator Feedback Disconnection/Short Circuit (OPEN/SHORT)
SHORT Range [TEMP F/B Voltage ≤ 0.1V], OPEN Range [TEMP F/B Voltage ≥ 4.9V]
20
 Dr TEMP DOOR POTENTIOMETER LOCKED
 If the actuator cannot reach the desired control position in 10 seconds, then it is deemed to be locked.
21
 MODE DOOR POTENTIOMETER Disconnection/Short Circuit (OPEN/SHORT)
SHORT Range [DR MODE F/B Voltage ≤ 0.1V]
OPEN Range [DR MODE F/B Voltage ≥ 4.9V]
22
 MODE DOOR POTENTIOMETER LOCKED
 If the actuator cannot reach the desired control position in 10 seconds, then it is deemed to be locked.
24
 AUTO DEFOG SENSOR (SHORT)
 ADS specification ONLY　
25
 INTAKE DOOR POTENTIOMETER Disconnection/Short Circuit (OPEN/SHORT)
SHORT Range [INTAKE F/B Voltage ≤ 0.1V]
OPEN Range [INTAKE F/B Voltage ≥ 4.9V]
26
 INTAKE DOOR POTENTIOMETER LOCKED
 If the actuator cannot reach the desired control position in 10 seconds, then it is deemed to be locked.
32
 PASSENGER TEMP DOOR POTENTIOMETER Disconnection/Short Circuit (OPEN/SHORT)
SHORT Range [TEMP F/B Voltage ≤ 0.1V]
OPEN Range [TEMP F/B Voltage ≥ 4.9V]
33
 PASSENGER TEMP DOOR  POTENTIOMETER LOCKED
43
 DEFOG DOOR POTENTIOMETER Disconnection/Short Circuit (OPEN/SHORT)
 ADS specification ONLY
SHORT Range [DEFOG F/B Voltage ≤ 0.1V]
OPEN Range [DEFOG F/B Voltage ≥ 4.9V]
44
 DEF DOOR POTENTIOMETER LOCKED
 If the actuator cannot reach the desired control position in 10 seconds, then it is deemed to be locked.
ADS specification ONLY
45
 APT CAN Signal Error
47
 RPM CAN SIGNAL Error
48
 Vehicle Speed CAN Signal Error
49
 Engine coolant temperature CAN Signal Error
71
 ECV Fault (OPEN)
72
 Communication error between the front and rear seats.

4.
FAIL SAFE
NO
SIGNAL / ITEM
Failure Criteria
Alternative Value in Case of Failure
1
 INCAR SENSOR
 Voltage ≤ 0.1V or Voltage ≥ 4.9V
 Fixed at 22°C
2
 AMB SENSOR
 Voltage ≤ 0.1V or Voltage ≥ 4.9V
 Fixed at 20°C
3
 EVA SENSOR
 Voltage ≤ 0.1V or Voltage ≥ 4.9V
 Fixed at -2°C
4
 TEMPERATURE CONTROL ACTUATOR
 Voltage ≤ 0.1V or Voltage ≥ 4.9V
 When the set temperature is 16.5°C → 22°C :
Fixed to the maximum cooling.
When the set temperature is 22.5°C → 27.5°C : Fixed to the maximum heating.
5
 MODE CONTROL ACTUATOR
 Voltage ≤ 0.1V or Voltage ≥ 4.9V
 In case of vent mode : Vent position is fixed.
Other modes other than the vent :
Defrost position is fixed.
6
 INTAKE ACTUACOR
 Voltage ≤ 0.1V or Voltage ≥ 4.9V
 In case of outdoor ventilation mode :
Outdoor ventilation position is fixed.
In case of indoor ventilation mode :
Indoor ventilation position is fixed.
7
 AUTO DEFOGGING SENSOR (relative humidity)
 OPEN / SHORT
 Relative humidity : 0 %
8
 Engine coolant temperature
 OPEN / SHORT
 -2°C
9
 ECV Feedback
 OPEN
 ECV output OFF

Replacement
1.
Disconnect the negative (-) battery terminal.
2.
Remove the console upper cover (A).
3.
Press the lock pin, separate the console upper cover connectors (A).
4.
Loosen the mounting screws, remove the drive mode unit (A) and SBW switch unit assembly (B).
5.
Loosen the mounting screws, remove the heater & A/C control unit (A).
6.
Install in the reverse order of removal.
  
•
Replace any damaged clips.
•
Make sure the connector is connected properly.

    Component Connector Pin Function Pin No Connector A Connector B 1 Battery Temperature Actuator Feedback - Passenger 2 ISG B+ Temperature Actuator (Cool) - Passenger 3 ILL+ (TAIL) Temperature Actuator (Warm) - Passenger 4 Sensor REF (+5V) Defogging Actuator Feedback 5 Mode Actuator Feedback Defogging Actuator (Open) 6 Temperature Actuator Feedback - Driver Defogging Actuator (Close) 7 Intake Actuator Feedback - 8 Evaporator Temperature Sensor (+) - 9 Ambient Temperature Sensor (+) - 10 Mode Actuator (Vent) In-car sensor (+) 11 Mode Actuator (Defrost) PAB IGN1 12 Temperature Control Actuator (Cool) - Driver Defogging Sensor Glass Temperature 13 Temperature Control Actuator (Warm) - Driver - 14 Intake Actuator (Fresh Air) - 15 Intake Actuator (Recirculated Air) - 16 HTD (Rear Defrost) Ground 17 Rear Defogging Swich Rear Blower Motor (+) 18 - Rear Mosfer (Drain Feedback) 19 - Rear Mosfer (Gate) 20 ILL - (RHEO) - 21 IGN 2 - 22 IGN 1 - 23 Blower Motor (+) - 24 Photo Sensor (-)_LEFT LIN BUS (Climate control) 25 Photo Sensor (-)_RIGHT - 26 Defogging Sensor Data - 27 Defogging Sensor SCL - 28 - - 29 PTC Relay 2 (DIESEL) / Driver Seat Signal PWM PTC Relay (GASOLINE) 30 PTC ON Signal (DIESEL) / - - (GASOLINE) 31 - Rear C-LINE 32 - - 33 P_CAN (HIGH) 34 P_CAN (LOW) 35 Mosfet (DRAIN F/B) 36 Mosfet (GATE) 37 ECV (+) 38 ECV (-) Ground 39 Sensor Ground 40 Ground

    Component [Connector Pin Function] Pin No Connector A 1 Battery (+) 2 IGN2 3 ILL+ (TAIL) 4 REAR C-LINE 5 ILL- (RHEO) 6 Ground

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