Hyundai Sonata LF Quiz
Heating, Ventilation, and Air Conditioning

Photo Sensor Repair Procedures

In this manual: Heating, Ventilation, and Air Conditioning
General Information — 9Engine Mechanical System — 90Engine Electrical System — 58Emission Control System — 24Engine Control System/Fuel System — 114Drive Shaft and Axle — 15Suspension System — 35Steering — 19Restraints — 50Brake System — 54Body (Interior and Exterior) — 213Body Electrical System — 241Heating, Ventilation, and Air Conditioning — 56DCT (Dual Clutch Transmission) System — 52
7steps
~42min
2/5difficulty
Done 0 of 7

Inspection

  1. Turn the ignition on.
  2. Connect the GDS.
  3. Direct intense light onto the photo sensor using a lamp, and check the change in output voltage.
  4. The voltage will increase with more intense light and decrease with less intense light.
    1. Auto Light Signal
    2. Auto Light Ground
    3. Photo Signal (Right)
    4. LED Power (B+)    		 5. LED Ground (to BCM)
    6. Photo Signal (Left)
    7. Photo Force
    8. Auto Light Power (5 V)

Replacement

  1. Disconnect the negative (-) battery terminal.
  2. Using a flat-blade screwdriver, remove the photo sensor (A) from the center of the defroster nozzle after disconnecting the connector (B).
  3. Install in the reverse order of removal.

Test yourself

A quick Hyundai Sonata LF quiz: every answer comes with an explanation and a link to the manual page.