Dual Automatic Temperature Control (DATC) Unit

Components and Component Location

Components

Connector Terminal Function

Connector A

Repair Procedures

Self-Diagnosis

1. 1

   Self-Diagnosis Procedure

   

2. 2

   How to Read the Self-Diagnosis Code

   After the display panel flashes three times at 0.5-second intervals, the corresponding fault code flashes on the set temperature display at 0.5-second intervals and a two-digit number is shown. The codes are indicated in numeric format.

3. 3

   Trouble Code Display

   1. Continuous operation: one DTC

      

   2. Continuous operation: more than two DTCs.

      

   3. STEP Operation

      A.	Normal or one fault code matches continuous operation.

      B.	More than two DTCs.

      

4. 4

   If trouble codes are displayed during inspection, check the possible causes of the malfunction by referring to the trouble codes.

   Display	Description of Malfunction
   0	Normal
   11	In-Car Sensor Open
   12	In-Car Sensor Short Circuit
   13	Ambient Sensor Open
   14	Ambient Air Sensor Short Circuit
   17	Evaporator Sensor Open
   18	Evaporator Sensor Short Circuit
   19	Air Temperature Door Potentiometer Open/Short - Actuator
   20	Air Temperature Door Potentiometer Malfunction - Actuator
   21	Mode Door Potentiometer Open/Short
   22	Mode Door Potentiometer Malfunction
   23	Anti-Fog Sensor Open
   24	Anti-Fog Sensor Short Circuit
   25	Intake Door Potentiometer Open/Short Circuit
   26	Intake Door Potentiometer Malfunction
   32	Air Temperature Door Potentiometer Open/Short - Passenger
   33	Air Temperature Door Potentiometer Malfunction - Passenger
   34	Console Temperature Door Potentiometer Open/Short Circuit
   35	Console Temporary Door Potentiometer Malfunction
   36	Console ON/OFF Door Potentiometer Open/Short
   37	Console ON/OFF Door Potentiometer Malfunction
   43	Anti-Fog Potentiometer Open/Short Circuit
   44	Auto Defog Potentiometer Malfunction
   45	APT CAN signal error
   47	RPM CAN Signal Malfunction
   48	Vehicle Speed CAN Signal Malfunction
   49	Engine Coolant Temperature CAN Signal Malfunction
   66	Console Temperature Switch Open/Short
   71	Electronic Control Valve Malfunction
   72	Panel LIN Communication Error

5. 5

   Fail-safe

   NO.	Item	Fault	Fail-safe
   1	Vehicle Sensor	Open or short	Monitor value 25 °C
   2	Ambient Temperature Sensor	Open or short	Monitor value 20 °C
   3	Evaporator Temperature Sensor	Open or short	Monitor value -2°C (28.4°F)
   4	TEMPERATURE DOOR POTENTIOMETER	Open or short	If the set temperature is 17°C-24.5 °C, fix the position to maximum cooling.
   			If the set temperature is 25°C-32°C, fix the position to maximum heating.
   5	MODE DOOR POTENTIOMETER	Open or short	Fix the position to ventilation in ventilation mode.
   			Fix the position to defrost in all modes except ventilation mode.
   6	INTAKE DOOR POTENTIOMETER	Open or short	Fix the fresh air position in fresh air mode.
   			Fix the recirculation position in recirculation mode.
   7	DEFOG DOOR POTENTIOMETER	Open or short	Fix the closed position when the closed mode is selected.
   			Fix the open position in other cases.
   8	ECV	Open	CF_Fatc_EcvFlt = 01H (malfunction) ECV OFF, A/C output OFF, torque 0.2 N·m
   9	NOTICE	Open or short	HUMIDITY 0%
   11	C_SunRoofOpenState	NO request	Check until "CLOSE" value
   17	F_N_ENG	NO request	650 rpm
   18	N	F_N_ENG="Error" or NO request	650 rpm
   20	RLI _ AC	NO request	Compressor OFF (ECV OFF)
   21	VS (Vehicle Speed)	FFh or no reception	VS-TCU (from TCU2)
   22	VS TCU (vehicle speed calculated by TCU)	FFh or no reception	Monitor value 0 km/h
   27	PV_AV_CAN	FFh or no reception	Actuator control with 0% value
   28	TEMP_ENG	FFh or no reception	90°C
   29	R _ PAcnC (APT sensor output value)	FFh or no reception	Control with 0 hPa value (ECV OFF)
   32	R_TqAcnApvC	FFh or no reception	Control with 0 N·m value

Replacement

1. 1

   Disconnect the negative (-) battery terminal.

2. 2

   Remove the heater and A/C control unit (A).

   

3. 3

   Disconnect the connectors (A) from the heater and A/C control unit.

   

4. 4

   Install in the reverse order of removal.