Kia Sedona (2008 year). Instruction — part 246

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 Rear Air Mix potentiometer.

3. Measure resistance between terminal "6" of Rear Air Mix Potentiometer and terminal "6" 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 3:56:08 PM

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Fig. 117: Checking Resistance Between Terminals Of Rear Air Mix Potentiometer And
Terminals
Courtesy of KIA MOTORS AMERICA, INC.

4. Is the measured resistance within specifications?

YES

Go to step 2.

NO

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

2. Check for short to ground in harness.

1. Ignition "OFF"

2. Disconnect Rear Air Mix potentiometer.

3. Measure resistance between terminal "6" of Rear Air Mix Potentiometer and chassis ground.

Specification: Approx. infinity ohms

Fig. 118: Checking Resistance Between Terminal "6" Of Rear Air Mix Potentiometer And
Chassis Ground

2008 Kia Sedona EX

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

Microsoft

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

Page 107

© 2006 Mitchell Repair Information Company, LLC.

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

POWER SUPPLY CIRCUIT INSPECTION

1. Check for short or open in harness.

1. Ignition "ON"

2. Connect Rear Air Mix Potentiometer.

3. Measure voltage between terminal "5" of Rear Air Mix Potentiometer and chassis ground.

Specification: Approx. 5V

Fig. 119: Checking Voltage Between Terminal "5" Of Rear Air Mix Potentiometer 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 short or open in power harness. Repair as necessary and go to "VERIFICATION OF

2008 Kia Sedona EX

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

Microsoft

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

Page 108

© 2006 Mitchell Repair Information Company, LLC.

VEHICLE REPAIR" procedure.

COMPONENT INSPECTION

1. Check actuator motor.

1. Ignition "OFF"

2. Disconnect Rear Air Mix Potentiometer.

3. Verify that the temperature actuator operates to the hot position when connecting 12V to the

terminal "3" and grounding terminal "4".

4. Verify that the temperature actuator operates to the cool position when the connections are

reversed.

Fig. 120: Checking Terminal 3 And Grounding Terminal 4
Courtesy of KIA MOTORS AMERICA, INC.

5. Does the actuator work properly?

YES

Go to step 2.

NO

Substitute with a known-good actuator and check for proper operation. If the problem is corrected,
replace actuator and then go to "VERIFICATION OF VEHICLE REPAIR" procedure.

2. Check potentiometer

1. Ignition "ON"

2. Connect Rear Air Mix potentiometer.

3. Measure voltage between terminal "6" and "7" of Rear Air Mix potentiometer while operating the

temp, switch.

Specification: Refer the specifications in DOOR POSITION CHART)

2008 Kia Sedona EX

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

Microsoft

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

Page 109

© 2006 Mitchell Repair Information Company, LLC.