Heater and A/C Control Unit (DATC) Repair Procedures

Self-Diagnosis

1. 1
   Self-Diagnosis Procedure

   

2. 2
   How to Read Self-Diagnosis Codes: After the indication, the panel blinks three times every 0.5 seconds, the corresponding trouble code blinks on the temperature setting display every 0.5 seconds and shows two digits. Codes are displayed in numeric format. Trouble codes are displayed in numeric format.

   Display	Description of Malfunction
   0	Normal
   11	In-Car Sensor Open
   12	In-Car Sensor Short Circuit
   13	Ambient Temperature Sensor Open Circuit
   14	Ambient Temperature Sensor Short Circuit
   17	Evaporator Temperature Sensor Open Circuit
   18	Evaporator Temperature Sensor Short Circuit
   19	Temperature Door Potentiometer Open/Short (Driver)
   20	Temperature Door Potentiometer Malfunction (Driver)
   21	Mode Door Potentiometer Open/Short
   22	Mode Door Potentiometer Malfunction
   23	Anti-Fog Sensor Open Circuit
   24	Anti-Fog Sensor Short Circuit
   25	Intake Door Potentiometer Open/Short Circuit
   26	Intake Door Potentiometer Malfunction
   32	Temperature Door Potentiometer Open/Short (Passenger)
   33	Temperature Door Potentiometer Malfunction (Passenger)
   45	APT (A/C Pressure Transducer) CAN Signal Malfunction
   47	RPM CAN Signal Malfunction
   48	Vehicle Speed CAN Signal Malfunction
   49	Engine Coolant Temperature CAN Signal Malfunction
   50	Cluster ionizer malfunction
   51	Vent Duct Sensor Open
   52	Vent Duct Sensor Short
   53	Floor Duct Sensor Open
   54	Floor Duct Sensor Short

3. 3
   Trouble Code Display

   1. Continuous Operation: No DTC or One DTC.

      

   2. Continuous Operation: Two or More DTCs.

      

   3. STEP Operation

      A.	Normal code or one trouble code is the same as continuous operation.

      B.	Two or more DTCs are present.

      

4. 4
   If trouble codes are displayed during inspection, check the cause of the malfunction by referring to the trouble code table.
5. 5
   Fail-safe

   1. Interior Temperature Sensor: Check with a value of 25 °C
   2. Ambient Temperature Sensor: Check with value of 20 °C
   3. Evaporator Temperature Sensor: Check with value of -2°C (28.4°F)
   4. Water Temperature Sensor: Check with a value of -2°C (28.4°F)
   5. Temperature Control Actuator (Air Mix Potentiometer): If the set temperature is 15 °C - 22 °C, set the air mix door to the maximum cooling position. If the set temperature is 23 °C - 30 °C, set the air mix door to the maximum heating position.
   6. Mode Control Actuator (Direction Potentiometer): Fix the vent position when the vent mode is selected. Fix the defrost position by selecting any mode except the vent mode.
   7. Intake Control Actuator: Fix in the fresh air position when fresh air mode is selected. Fix in the recirculation position when recirculation mode is selected.
   8. Automatic Defogging Sensor: Control with 0% value.

Replacement

1. 1
   Disconnect the negative (-) battery terminal.
2. 2
   Remove the boots (B) and the shift lever (A).

   

3. 3
   Using a screwdriver or removal tool, remove the console trim (A). [LH]

   

   [RH]

   

4. 4
   Using a screwdriver or remover, remove the console upper cover (A).

   

5. 5
   Disconnect the indicator connector (A).

   

6. 6
   Disconnect the EPB switch connector (A).

   

7. 7
   After loosening the mounting screws, remove the console tray (A).

   

8. 8
   Disconnect the connectors (A).

   

9. 9
   Remove the emergency pad lower panel. (Refer to Body - "Emergency Pad Lower Panel")
10. 10
    Remove the glove box housing. (Refer to Body - "Glove Box Housing")
11. 11
    Loosen the mounting screws and remove the crash pad center lower panel (A).

    

12. 12
    Disconnect the heater control unit connectors (A) and hose (B).

    

13. 13
    Remove the heater A/C control unit (A) from the lower center panel of the instrument panel (B) after loosening the mounting screws.

    

14. 14
    Install in the reverse order of removal.