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

Hyundai Santa Fe (TM) 2019-2024 Service 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.

    Heater & A/C Control Unit (DATC). Components and components location

    ..

    Heater & A/C Control Unit (Rear). Components and components location

    ..

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    To reduce the risk of an air bag deploying unexpectedly and causing serious injury or death:

    Do not hit or allow any objects to impact the locations where air bags or sensors are installed. Do not perform maintenance on or around the air bag sensors. If the location or angle of the sensors is altered, the air bags may deploy when they should not or may not deploy when they should. Installing bumper guards with nongenuine Hyundai or non-equivalent parts may adversely affect the collision and airbag deployment performance. Press the Engine Start/Stop button to the OFF or ACC position and wait for 3 minutes when the vehicle is being towed to prevent inadvertent air bag deployment. Have all air bag repairs performed by an authorized HYUNDAI dealer.

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