Heater and Air Conditioning Control Unit (Dual) Repair Procedures

Self-Diagnosis

1. 1
   Self-Diagnosis Procedure

   

2. 2
   How to read self-diagnosis code: After the display panel flashes three times every 0.5 seconds, the corresponding fault code flashes on the set temperature display panel every 0.5 seconds and shows two digits. Codes are displayed in numeric format. Fault Code

   Display	Description of Malfunction
   00	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
   26	Intake Door Potentiometer Short Circuit
   32	Air Temperature Door Potentiometer Open/Short - Passenger
   33	Air Temperature Door Potentiometer Malfunction - Passenger
   43	Anti-Fog Door Potentiometer Open/Shorted
   44	Anti-Fog Door 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
   50	Cluster Ionizer Generator Malfunction
   71	ECV Error (Open)

3. 3
   Trouble Code Display

   1. Continuous Operation: One DTC.

      

   2. Continuous Operation: More than two DTCs.

      

   3. STEP Operation

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

      B.	More than two DTCs.

      

4. 4
   If any diagnostic trouble codes are displayed during the inspection, check the causes of the malfunction by referring to the DTC troubleshooting.
5. 5
   Fail-safe

   1. In-Car Temperature Sensor: Check with 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: Monitor with value of -2°C (28.4°F) / Calculate Estimated Torque: 90 °C
   5. Temperature control actuator (air mix potentiometer): If the temperature setting is 17°C-24°C, 5 °C, lock in the maximum cooling position. If the temperature setting is 25°C-32°C, lock in the maximum heating position.
   6. Mode Control Actuator (Direction Potentiometer): Fix in the vent position when the vent mode is selected. Fix in the defrost position when any mode other than vent is selected.
   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.

Replacement

Using a flat-tip screwdriver, wrap protective tape around the tip and apply protective tape around the relevant parts to prevent damage. Use a plastic panel removal tool to remove the interior trim parts so as not to damage the surface. Be careful not to bend or scratch the trim and panels. Wear gloves to protect your hands.

1. 1
   Using a screwdriver or pry tool, remove the crash pad side cover (A).

   

2. 2
   Loosen the mounting screws, then remove the crash pad lower panel (A).

   

3. 3
   Disconnect the lower airbag switch connectors (A).
4. 4
   Disconnect the diagnostic connector (B) and the protector under the lamp connector (C). [Left]

   

5. 5
   Disconnect the start/stop button connector (D). [Right]

   

6. 6
   Using a screwdriver or removal tool, remove the [RH] trim panel (A).

   

7. 7
   After loosening the mounting screws, remove the heater control panel (A).

   

8. 8
   Disconnect the connectors (A) and the hose (B).

   

9. 9
   Loosen the mounting screws, then remove the heater control unit (A).

   

10. 10
    Installation is the reverse of removal.

    Make sure the connector is properly connected. Replace all damaged clips.