Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSHYUNDAI2009TUCSON LIMITED, 2.0 BREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSDTC CODES - HVAC SYSTEMB1208 INTAKE POTENTIOMETER OPEN (LOW)SIGNAL CIRCUIT INSPECTION

2009 Hyundai Tucson Limited, 2.0 B

Signal Circuit Inspection

2009 Hyundai Tucson Limited, 2.0 BSECTION Signal Circuit Inspection

Check for open in harness.
1. Ignition "OFF"
2. Disconnect Intake Potentiometer.
3. Measure resistance between terminal "6" of Intake Potentiometer and terminal "24" of Heater & A/C controller.
  Specification : Approx. 0 Ω
  
  Fig 1: Measuring Resistance Between Intake Potentiometer And Heater & A/C Controller Terminals
  Courtesy of HYUNDAI MOTOR CO.
4. Is the measured resistance within specifications?
  YES
  - Check for short to ground in harness.
  NO
  - Check for open in signal harness. Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check for short to ground in harness.
1. Ignition "OFF"
2. Disconnect Intake Potentiometer.
3. Measure resistance between terminal "6" of Intake Potentiometer and chassis ground.
  Specification : Approx. ∞Ω
  
  Fig 2: Measuring Resistance Between Intake Potentiometer Terminal 6 And Chassis Ground
  Courtesy of HYUNDAI MOTOR CO.
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.

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.