Kia Sedona (2008 year). Instruction — part 225

Fig. 24: Checking Resistance Between A/C Control Unit 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 Passenger's Air Mix potentiometer.

3. Measure resistance between terminal "7" of Passenger's Air Mix Potentiometer and chassis ground.

Specification: Approx. infinity ohms

Fig. 25: Checking Resistance Between Passenger Air Mix Potentiometer And Chassis Ground
Courtesy of KIA MOTORS AMERICA, INC.

4. Is the measured resistance within specifications?

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 "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 Passenger's Air Mix Potentiometer.

3. Measure voltage between terminal "5" of Passenger's Air Mix Potentiometer and chassis ground.

Specification: Approx. 5V

Fig. 26: Checking Voltage Between Terminal 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
VEHICLE REPAIR" procedure.

COMPONENT INSPECTION

1. Check actuator motor.

1. Ignition "OFF"

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.

2. Disconnect Passenger's 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. 27: Checking Connector Terminals 3 And 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 Passenger's Air Mix potentiometer.

3. Measure voltage between terminal "5" and "6" of Passenger's Air Mix potentiometer while

operating the temp, switch.

Specification: Refer to DOOR POSITION CHART

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.

Fig. 28: Checking Voltage Between Air Mix Potentiometer Terminals
Courtesy of KIA MOTORS AMERICA, INC.

DOOR POSITION CHART

Fig. 29: Air Mix Graph
Courtesy of KIA MOTORS AMERICA, INC.

4. Is the measured voltage within specifications in DOOR POSITION CHART?

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.

Door position

Voltage (5-6)

Error detecting

MAX. Cooling

0.3 ± 0.15V

Low voltage: 0.08V

or less

MAX. Heating

4.7 ± 0.15V

High voltage: 4.9V

or more

2008 Kia Sedona EX

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

Microsoft

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

Page 25

© 2006 Mitchell Repair Information Company, LLC.