Kia Sedona (2008 year). Manual - part 234

DTC DETECTING CONDITION CHART

SPECIFICATION 

Refer to DTC B1233. 

MONITOR SCAN TOOL DATA 

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

2. Engine "ON"  

3. Monitor the "IN-CAR TEMP. SENSOR" Parameter on the scan tool. 

Fig. 65: Diagnosis Function Screen Display - In-Car Temp Sensor 
Courtesy of KIA MOTORS AMERICA, INC. 

4. Are the DTC B1234 present and is parameter of "IN-CAR TEMP. SENSOR" fixed? 

Parameter of "IN-CAR TEMP. SENSOR" will be fixed at 25°C (77°F), if there is any fault in IN-CAR 
TEMP. SENSOR. 

YES  

Go to TERMINAL AND CONNECTOR INSPECTION procedure.

Item

Detecting Condition

Possible cause

DTC Strategy



Resistance check  



Open Circuit in harness  



Faulty in-car temp. Sensor  



Faulty A/C control unit  

Threshold value



> 509.57 kohms  

Detecting time



0.3 sec  

FAIL SAFE



Control with the value of 25°C (77°F)  

 

2008 Kia Sedona EX 

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

  

Microsoft 

 

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

Page 58 

© 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 B1233. 

SIGNAL CIRCUIT INSPECTION 

1. Check for open in harness. 

1. Ignition "OFF"  

2. Disconnect in-car temp, sensor.  

3. Measure resistance between terminal "4" of in-car temp, sensor and terminal "3" of A/C Control 

Unit. 

Specification: Approx. 0 ohms 

Fig. 66: Checking Resistance Between Terminal "4" Of In-Car Temp, Sensor And Terminal 
"3" Of A/C Control Unit 
Courtesy of KIA MOTORS AMERICA, INC. 

4. Is the measured resistance within specifications? 

YES  

Go to "GROUND CIRCUIT INSPECTION" procedure. 

NO  

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

 

2008 Kia Sedona EX 

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

  

Microsoft 

 

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

Page 59 

© 2006 Mitchell Repair Information Company, LLC. 

REPAIR" procedure. 

GROUND CIRCUIT INSPECTION 

1. Check for open in ground harness. 

1. Ignition "OFF"  

2. Disconnect in-car temp, sensor.  

3. Measure resistance between terminal "2" of in-car temp, sensor and terminal "11" of A/C Control 

Unit. 

Specification: Approx. 0 ohms 

Fig. 67: Checking Resistance Between Terminal "2" Of In-Car Temp, Sensor And Terminal 
"11" Of A/C Control Unit 
Courtesy of KIA MOTORS AMERICA, INC. 

4. Is the measured resistance within specifications? 

YES  

Go to "COMPONENT INSPECTION" procedure. 

NO  

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

COMPONENT INSPECTION 

Refer to DTC B1233. 

VERIFICATION OF VEHICLE REPAIR 

Refer to DTC B1233. 

 

2008 Kia Sedona EX 

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

  

Microsoft 

 

Monday, May 24, 2010 3:56:08 PM

Page 60 

© 2006 Mitchell Repair Information Company, LLC. 

DTC B1237 AMBIENT TEMPERATURE SENSOR SHORT (LOW) 

COMPONENT LOCATION 

Fig. 68: Identifying Ambient Temperature Sensor Component Location 
Courtesy of KIA MOTORS AMERICA, INC. 

GENERAL DESCRIPTION 

The ambient temperature senor located at the center stay of the condenser, detects ambient air temperature. It is 
a negative type thermistor whose resistance is inversely proportional to temperature. Its output is used for 
discharge temperature sensor, sensor fail-safe, temperature regulation door lock, blower motor level control, 
mix mode control and in-car humidity control. 

DTC DESCRIPTION 

The A/C controller sets DTC B1237 if there is a short circuit in ambient temp, sensor signal harness or the 
measured resistance value of sensor is less than threshold value (about 7.48kohms) 

DTC DETECTING CONDITION 

DTC DETECTING CONDITION CHART 

SPECIFICATION 

TEMPERATURE SPECIFICATION 

Item

Detecting Condition

Possible cause

DTC Strategy



Resistance check  



Short circuit in harness  



Faulty ambient temp. Sensor 



Faulty A/C control unit  

Threshold value



< 7.48 k ohms  

Detecting time



0.3 sec  

FAIL SAFE



Control with the value of 20°C (68°F)  

Temperature [°C (°F)]

Resistance (kohms)

Temperature [°C (°F)]

Resistance (kohms)

 

2008 Kia Sedona EX 

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

  

Microsoft 

 

Monday, May 24, 2010 3:56:08 PM

Page 61 

© 2006 Mitchell Repair Information Company, LLC.