Kia Forte: Auto Light Sensor Inspection

In the state of IGN1 ON, when multifunction switch module detects auto light switch on, tail lamp relay output and head lamp low relay output are controlled according to auto light sensor's input.

The auto light control doesn't work if the pin sunlight supply (5V regulated power from Ignition 1 power to sunlight sensor) is in short circuit with the ground.

If IGN1 ON, The BCM monitors the range of this supply and raises up a failure as soon as the supply’s voltage is out of range. Then this failure occurs and as long as this is present, the head lamp must be turned on without taking care about the sunlight level provided by the sensor.

This is designed to prevent any head lamp cut off when the failure occurs during the night.

Circuit Diagram

...

Auto Light Sensor Removal

1. Disconnect the negative (-) battery terminal. 2. Remove the auto light sensor (A) from crash pad upper side by using screw (-) driver. ...

See also:

Engine Room Under Cover Components
1. Under cover front pannel. 2. Engine room LH under cover 3. Engine room RH under cover ...

Rear Oil Seal Installation
1. Install a new rear oil seal. (1) Apply engine oil on the edge of new oil seal. (2) ...

Automatic-dimming Function
To protect your vision during nighttime driving, your mirror will automatically dim upon detecting glare from the vehicles traveling behind you. The auto-dimming function can be controlled by ...