Kia Sedona (2008 year). Instruction — 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

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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

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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

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© 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.