Hyundai Sonata LF: Air Conditioning System / Photo Sensor Repair procedures

Hyundai Sonata LF 2014-2019 Service Manual / Heating, Ventilation and Air Conditioning / Air Conditioning System / Photo Sensor Repair procedures

Inspection

1.	Turn the ignition switch ON.

2.	Connect the GDS.

3.	Emit intensive light toward the photo sensor using a lamp, and check the output voltage change.

The voltage will rise with higher intensive light and reduce with lower intensive light.

1. Auto light signal
2. Auto light ground
3. Photo signal (RH)
4. LED power (B+)

5. LED ground (To BCM)
6. Photo signal (LH)
7. Photo power
8. Auto light power (5V)

Replacement

1.	Disconnect the negative (-) battery terminal.

2.	With a flat-head screwdriver, remove the photo sensor (A) from the center of the defrost nozzle after disconnecting the connector (B).

3.	Install in the reverse order of removal.

Photo Sensor Description and Operation

Description The photo sensor is located at the center of the defrost nozzles. The photo sensor contains a photovoltaic (sensitive to sunlight) diode...

Ambient Temperature Sensor Description and Operation

Description The ambient temperature sensor is located at the front of the condenser and detects ambient air temperature. It is a negative type thermistor; resistance will increase with lower temperature, and decrease with higher temperature...

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