Kia Sedona (2008 year). Manual - part 224

POWER SUPPLY CIRCUIT INSPECTION

1. Check for open in power harness. 

1. Ignition "ON"  

2. Disconnect Humidity Sensor.  

3. Measure voltage value between terminal "5" of Humidity Sensor and chassis ground. 

Specification: 5V 

Fig. 20: Checking Voltage Between Terminal "5" Of Humidity Sensor And Chassis Ground 
Courtesy of KIA MOTORS AMERICA, INC. 

4. Is the measured voltage within specifications? 

YES  

Go to "COMPONENT INSPECTION" procedure. 

NO  

Check for open in power harness. Repair as necessary and go to "VERIFICATION OF 
VEHICLE REPAIR" procedure. 

COMPONENT INSPECTION 

Refer to DTC B1200. 

VERIFICATION OF VEHICLE REPAIR 

Refer to DTC B1200. 

DTC B1204 AIR MIX POTENTIOMETER OPEN (LOW) - PASSENGER'S 

COMPONENT LOCATION 

 

2008 Kia Sedona EX 

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

  

Microsoft 

 

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

Page 18 

© 2006 Mitchell Repair Information Company, LLC. 

Fig. 21: Identifying Temperature Control Actuator Component Location 
Courtesy of KIA MOTORS AMERICA, INC. 

GENERAL DESCRIPTION 

Temperature control actuator located at heater unit, regulates the temperature by the procedure as follows. 
Signal from control unit adjusts position of temp, door by operating temp, motor and then temperature will be 
regulated by the hot/cold air ratio decided by position of temp. door. 

DTC DESCRIPTION 

The A/C controller sets DTC B1204 if there is an open circuit or poor connection in the air mix potentiometer. 

DTC DETECTING CONDITION 

DTC DETECTING CONDITION CHART 

SPECIFICATION 

Item

Detecting Condition

Possible cause

DTC Strategy



Voltage check  



Poor connection of 

connected part 



Open circuit in harness 



Short circuit in harness 



Faulty driver Air Mix 

potentiometer 

Threshold value



< 0.1V  

Detecting time



0.3 sec  

FAIL SAFE



If temperature setting 17-

24.5°C (63-76°F) fix at 

max. cooling position.  



If temperature setting 25-

32°C (77-90°F) fix at max. 

heating position.  

 

2008 Kia Sedona EX 

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

  

Microsoft 

 

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

Page 19 

© 2006 Mitchell Repair Information Company, LLC. 

Fig. 22: Air Mix Graph 
Courtesy of KIA MOTORS AMERICA, INC. 

MONITOR SCAN TOOL DATA 

1. Connect scan tool to Data Link Connector (DLC).  

2. Engine "ON"  

3. Monitor the "Passenger's Air Mix Potentiometer" Parameter on the scan tool while operating temp, 

switch. 

Fig. 23: Diagnosis Function Screen Display - Air Mix Potentiometer (PA) 
Courtesy of KIA MOTORS AMERICA, INC. 

4. Are the DTC B1204 present and is parameter of "Passenger's Air Mix Potentiometer" fixed? 

Parameter of "Passenger's Air Mix Potentiometer" will be fixed at 100% (or any value above 90%), or 0% 
(or any value below 10%), if there is any fault in Passenger's Air Mix potentiometer. 

YES  

 

2008 Kia Sedona EX 

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

  

Microsoft 

 

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

Page 20 

© 2006 Mitchell Repair Information Company, LLC. 

Go to TERMINAL AND CONNECTOR INSPECTION procedure.

NO  

Fault is intermittent caused by poor contact in the sensor's and/or A/C controller's connector or was 
repaired and A/C controller memory was not cleared. Thoroughly check connectors for looseness, poor 
connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary 
and then go to "VERIFICATION OF VEHICLE REPAIR" procedure. 

TERMINAL AND CONNECTOR INSPECTION 

1. Many malfunctions in the electrical system are caused by poor harness and terminals. 

Faults can also be caused by interference from other electrical systems, and mechanical or chemical 
damage. 

2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, 

deterioration, or damage.  

3. Has a problem been found? 

YES  

Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR" procedure. 

NO  

Go to "SIGNAL CIRCUIT INSPECTION" procedure. 

SIGNAL CIRCUIT INSPECTION 

1. Check for open in harness. 

1. Ignition "OFF"  

2. Disconnect Passenger's Air Mix potentiometer.  

3. Measure resistance between terminal "6" of Passenger's Air Mix Potentiometer and terminal "14" 

of A/C control unit. 

Specification: Approx. 0 ohms 

 

2008 Kia Sedona EX 

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

  

Microsoft 

 

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

Page 21 

© 2006 Mitchell Repair Information Company, LLC.