Kia Sedona (2008 year). Manual - part 223

Substitute with a known-good Humidity sensor and check for proper operation. 

If the problem is corrected, replace Humidity sensor and then go to "VERIFICATION OF 
VEHICLE REPAIR" procedure. 

2. Check A/C Control Unit 

1. Engine "ON"  

2. Disconnect Humidity Sensor.  

3. Measure voltage value between terminal "6" of A/C control unit and chassis ground. 

Specification: 5V 

Fig. 16: Checking Voltage Between Terminal "6" Of A/C Control Unit And Chassis Ground
Courtesy of KIA MOTORS AMERICA, INC. 

4. Is the measured voltage within specification? 

YES  

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. 

NO  

Substitute with a known-good A/C Control Unit and check for proper operation. 

If the problem is corrected, replace A/C Control Unit and then go to "VERIFICATION OF 
VEHICLE REPAIR" procedure. 

VERIFICATION OF VEHICLE REPAIR 

After a repair, it is essential to verify that the fault has been corrected.

 

2008 Kia Sedona EX 

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

  

Microsoft 

 

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

Page 14 

© 2006 Mitchell Repair Information Company, LLC. 

1. Connect scan tool and select "Diagnostic Trouble Codes (DTCs)" mode and then clear DTC.  

2. Operate the vehicle and monitor the DTC on the scan tool.  

3. Are any DTCs present? 

YES  

Go to the applicable troubleshooting procedure. 

NO  

System is performing to specification at this time. 

DTC B1201 HUMIDITY SENSOR SHORT (LOW) 

COMPONENT LOCATION 

Fig. 17: Identifying Humidity Sensor Component Location 
Courtesy of KIA MOTORS AMERICA, INC. 

GENERAL DESCRIPTION 

Refer to DTC B1200. 

DTC DESCRIPTION 

The A/C controller sets DTC B1201 if there is a short circuit in humidity sensor signal harness or the measured 
frequency value of sensor is less than threshold value (about 6,186Hz) 

DTC DETECTING CONDITION 

DTC DETECTING CONDITION CHART 

Item

Detecting Condition

Possible cause

 

2008 Kia Sedona EX 

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

  

Microsoft 

 

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

Page 15 

© 2006 Mitchell Repair Information Company, LLC. 

SPECIFICATION 

Refer to DTC B1200. 

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

4. Are the DTC B1201 present and is parameter of "Humidity Sensor" fixed? 

Parameter of "Humidity Sensor" will be fixed at 10%, if there is any fault in Humidity Sensor. 

YES  

Go to TERMINAL AND CONNECTOR INSPECTION procedure.

DTC Strategy



Frequency check  



Open Circuit in power 
harness  



Short Circuit in signal 
harness  



Faulty Humidity Sensor  



Faulty A/C control unit  

Threshold value



< 6,186 Hz  

Detecting time



10msec  

FAIL SAFE



Control with the value of 
10%  

 

2008 Kia Sedona EX 

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

  

Microsoft 

 

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

Page 16 

© 2006 Mitchell Repair Information Company, LLC. 

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 

Refer to DTC B1200. 

SIGNAL CIRCUIT INSPECTION 

1. Check for short to ground in harness. 

1. Ignition "OFF"  

2. Disconnect Humidity Sensor.  

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

Specification: Approx. infinity ohms 

Fig. 19: Checking Resistance Between Terminal "5" Of Humidity Sensor And Chassis 
Ground 
Courtesy of KIA MOTORS AMERICA, INC. 

4. Is the measured resistance within specifications? 

YES  

Go to "POWER CIRCUIT INSPECTION" procedure. 

NO  

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

 

2008 Kia Sedona EX 

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

  

Microsoft 

 

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

Page 17 

© 2006 Mitchell Repair Information Company, LLC.