Hyundai Tucson: Auto Lighting Control System / Auto Light Sensor

- Inspection Check if the auto light control operates like a timing chart shown below.Tail lamp output and head lamp (Low) output is controlled based on the auto light sensor's input (illumination intensity) when the Auto Light Switch in Multi-Function Switch is turned ON, and the vehicle is in IGN1 or IGN2 ON Mode. If IGN1 = ON, BCM detects this voltage, and if the voltage exceeds rated voltage, then auto light failure occurs. (below 4V or above 6V)

• Failure Occurrence : If auto light failure occurs, the head lamp must be turned ON regardless of sun light level. This is to prevent the head lamp from being turned OFF in case of auto light failure during night time.

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 auto light sensor connector (A).

1.Connect the auto light sensor connector and install the auto light sensor.