Kia Sedona (2008 year). Manual - part 233

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 short to ground in harness. 

1. Ignition "OFF"  

2. Disconnect in-car sensor.  

3. Measure resistance between terminal "4" of in-car sensor and chassis ground. 

Specification: Approx. infinity ohms 

Fig. 60: Checking Resistance Between Terminal "4" Of In-Car Sensor And Chassis Ground 
Courtesy of KIA MOTORS AMERICA, INC. 

4. Is the measured resistance within specifications? 

YES  

Go to "COMPONENT INSPECTION" procedure. 

NO  

 

2008 Kia Sedona EX 

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

  

Microsoft 

 

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

COMPONENT INSPECTION 

1. Check in-car temp, sensor. 

1. Ignition "OFF"  

2. Disconnect in-car sensor.  

3. Measure resistance between terminal "4" and "2" of in-car sensor. 

Specification: Refer to Fig. 62 

Fig. 61: Checking Resistance Between Terminal "4" And "2" Of In-Car Sensor 
Courtesy of KIA MOTORS AMERICA, INC. 

Fig. 62: Resistance And Temperature Graph 
Courtesy of KIA MOTORS AMERICA, INC. 

4. Is the measured resistance within specifications in Fig. 62? (tolerance limits ± 3%) 

 

2008 Kia Sedona EX 

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

  

Microsoft 

 

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

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YES  

Go to step 2. 

NO  

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

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

2. Check A/C Control Unit 

1. Engine "ON"  

2. Disconnect in-car sensor.  

3. Measure Voltage between terminal "3" of A/C Control Unit and chassis ground. 

Specification: Approx. 5V 

Fig. 63: Checking Voltage Between Terminal "3" Of A/C Control Unit And Chassis Ground
Courtesy of KIA MOTORS AMERICA, INC. 

4. Is the measured voltage within specifications? 

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.

 

2008 Kia Sedona EX 

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

  

Microsoft 

 

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

Page 56 

© 2006 Mitchell Repair Information Company, LLC. 

VERIFICATION OF VEHICLE REPAIR

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

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 B1234 IN-CAR TEMPERATURE SENSOR OPEN (HIGH) 

COMPONENT LOCATION 

Fig. 64: Identifying In-Car Temperature Sensor Component Location 
Courtesy of KIA MOTORS AMERICA, INC. 

GENERAL DESCRIPTION 

Refer to DTC B1233. 

DTC DESCRIPTION 

The A/C controller sets DTC B1234 if there is an open circuit in in-car temp, sensor signal harness or the 
measured resistance value of sensor is more than threshold value (about 509.57kohms ) 

DTC DETECTING CONDITION 

 

2008 Kia Sedona EX 

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

  

Microsoft 

 

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

Page 57 

© 2006 Mitchell Repair Information Company, LLC.