1.The photo sensor is located at the center of the defrost nozzles.
2.The photo sensor contains a photovoltaic (sensitive to sunlight) diode. The solar radiation received by its light receiving portion, generates an electromotive force in proportion to the amount of radiation received which is transferred to the automatic temperature control module so that the solar radiation compensation will be performed.
1.Emit intensive light toward the photo sensor using a lamp, and check the output voltage change.
2.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 (SW)
8. Auto light power (5V)
1.Disconnect the negative (-) battery terminal.
2.Remove the crash pad upper garnish (A).

3.After removing the crash pad upper garnish, insert hand and push up the photo sensor (A) from the inside to remove it.

4.Disconnect the photo sensor connector (A).

5.To install, reverse removal procedure.
In-car Sensor
Ambient SensorHyundai Tucson (NX4) 2022-2026 Service Manual: Troubleshooting
- Troubleshooting
SymptomPossible causeRemedy
Hard steeringImproper front wheel alignmentCorrect
Excessive turning resistance of lower arm ball jointReplace
Low tire pressureAdjust
No power assistRepair and replace
Poor return of steering wheel to centerImproper front wheel alignmentCorrect
...
Hyundai Tucson (NX4) 2022-2026 Owner's Manual: Emission Control System
The emission control system of your
vehicle is covered by a written limited
warranty. Please see the warranty
information contained in the Owner’s
Handbook & Warranty Information
booklet in your vehicle.
Your vehicle is equipped with an
emission control system to meet all
applic ...