Kia Sedona (2008 year). Manual - part 221

Fig. 4: Identifying Blinking Pattern
Courtesy of KIA MOTORS AMERICA, INC. 

3. STEP operation 

A. Normal or one fault code is same as a continuance operation.  

B. DTC code of more two.  

Fig. 5: Identifying Blinking Pattern 
Courtesy of KIA MOTORS AMERICA, INC. 

4. Diagnostic procedure refer to DTC code.  

5. Fail safe 

1. In-car temperature sensor: Control with the value of 25°C (77°F)  

2. Ambient temperature sensor: Control with the value of 20°C (67°F)  

3. Evaporator temperature sensor: Control with the value of -2°C (28.4°F)  

4. Humidity sensor: Control with the value of 10%  

5. Temperature sensor: Control with the value of -2°C (28.4°F)  

6. Temperature control actuator (Air mix potentiometer): 

If temperature setting 17-24.5°C, fix at maximum cooling position. 

If temperature setting 25-32°C, fix at maximum heating position. 

7. Mode control actuator (Direction potentiometer): 

Fix vent position, while selecting vent mode. 

Fix defrost position, while selecting all except vent mode. 

8. Intake control actuator: 

Fix fresh position, while selecting fresh mode. 

Fix recirculation position, while selecting recirculation mode.

 

2008 Kia Sedona EX 

2008 HVAC Blower & A/C Controls (Automatic) - Sedona

  

Microsoft 

 

Monday, May 24, 2010 3:56:07 PM

Page 6 

© 2006 Mitchell Repair Information Company, LLC. 

REPLACEMENT 

1. Disconnect the negative (-) battery terminal.  

2. Remove the center air vent. Refer to INTERIOR .  

3. Remove the heater & A/C controller (A) after loosening 4 screws. 

Fig. 6: Identifying Heater & A/C Controller And Screws 
Courtesy of KIA MOTORS AMERICA, INC. 

Fig. 7: Identifying Heater & A/C Controller Harness 
Courtesy of KIA MOTORS AMERICA, INC. 

4. Remove the heater & A/C controller (A). 

 

2008 Kia Sedona EX 

2008 HVAC Blower & A/C Controls (Automatic) - Sedona

  

Microsoft 

 

Monday, May 24, 2010 3:56:07 PM

Page 7 

© 2006 Mitchell Repair Information Company, LLC. 

Fig. 8: Identifying Heater & A/C Controller 
Courtesy of KIA MOTORS AMERICA, INC. 

5. Installation is the reverse order of removal.  

DTC B1200 HUMIDITY SENSOR OPEN (HIGH) 

COMPONENT LOCATION 

Fig. 9: Identifying Humidity Sensor Component Location 
Courtesy of KIA MOTORS AMERICA, INC. 

GENERAL DESCRIPTION 

Humidity sensor located at crush pad, detects in-car humidity for in-car humidity control. If ambient air 
temperature or in-car humidity is outside certain range, it will turn on A/C to control in-car humidity for 
preventing in-car fogging. Air conditioner operation depends on ambient temperature and humidity. 

DTC DESCRIPTION 

The A/C controller sets DTC B1200 if there is an open circuit in humidity sensor signal harness or the measured 

 

2008 Kia Sedona EX 

2008 HVAC Blower & A/C Controls (Automatic) - Sedona

  

Microsoft 

 

Monday, May 24, 2010 3:56:07 PM

Page 8 

© 2006 Mitchell Repair Information Company, LLC. 

frequency value of sensor is more than threshold value (about 7,100Hz)

DTC DETECTING CONDITION 

DTC DETECTING CONDITION CHART 

SPECIFICATION 

FREQUENCY SPECIFICATION 

MONITOR SCAN TOOL DATA 

1. Connect scan tool to data link connector (DLC).  

2. Engine "ON"  

3. Monitor the "Humidity Sensor" Parameter on the scan tool while drying the humidity sensor with a hair 

drier or heat gun adjusted to a low heat setting. 

Fig. 10: Diagnosis Function Screen Display - Humidity Sensor 
Courtesy of KIA MOTORS AMERICA, INC.

Item

Detecting Condition

Possible cause

DTC Strategy



Frequency check  



Open Circuit in signal 
harness  



Faulty Humidity Sensor  



Faulty A/C control unit  

Threshold value



> 7,100 Hz  

Detecting time



0.01 sec  

FAIL SAFE



Control with the value of 
10%  

Relative humidity (%)

Frequency (Hz)

Relative humidity (%)

Frequency (Hz)

50

6,728

95

6,110

 

2008 Kia Sedona EX 

2008 HVAC Blower & A/C Controls (Automatic) - Sedona

  

Microsoft 

 

Monday, May 24, 2010 3:56:07 PM

Page 9 

© 2006 Mitchell Repair Information Company, LLC.