Hyundai Sonata: Auto Head Lamp Leveling Device / Auto Head Lamp Leveling Unit Description and Operation

Hyundai Sonata LF 2014-2019 Service Manual / Body Electrical System / Auto Head Lamp Leveling Device / Auto Head Lamp Leveling Unit Description and Operation

Description

According to driving environment and loading state of vehicle, head lamp lighting direction is changed to keep the driver's visibility range and to protect the driver's vision from glare, aiming at safety driving.

Sensor integrated ECU mounting on the rear center arm drives the actuator mounting on the head lamp since sensing the input signal following the vehicle's statically changes.

Head lamp beam is automatically operated by chassis tilt.

Operation

Operating Procedure

1.	Suspension angle change resulted from vehicle's load change.

2.	Sensor angle change.

3.	Microprocessor calculates necessary head lamp angle change amount.

4.	Sending a proper signal to head lamp leveling device and driving actuator.

Operating Condition

1.	Ignition on

2.	Low beam on

3.	On stop : If sensor lever change is 0.3° and above, head lamp is operated after max. 1.5 sec.

4.	On driving : If vehicle velocity is over 4km/h(2.48mile/h), velocity change is not over 0.8-1.6km/h(0.5 ~ 1.0mile/h) per second, and loading condition is changed, then head lamp is operated.

Components

Auto head lamp leveling unit

1. Leveling unit & sensor

2. Sensor mounting bracket

3. Sensor linkage

A.	Using a Micro-processor, percept the operation lever's mechanical angle change or speed signal.

B.	As an actuator control device of inner control program, mounting on the rear center arm.

Auto Head Lamp Leveling Unit Schematic Diagrams

Circuit Diagram ...

Auto Head Lamp Leveling Unit Repair procedures

Inspection 1. Ignition "ON". 2. Turn on the head lamp switch. 3. Check for operation. If the aim of the head lamps changes smoothly when the head lamp leveling switch is turned. 4. If ...

Other information:

Hyundai Sonata LF 2014-2019 Owners Manual: Maintenance Services
You should exercise the utmost care to prevent damage to your vehicle and injury to yourself whenever performing any maintenance or inspection procedures. We recommend you have your vehicle maintained and repaired by an authorized HYUNDAI dealer. An authorized HYUNDAI dealer meets HYUNDAI's high s ...

Hyundai Sonata LF 2014-2019 Service Manual: Repair procedures
Inspection 1. After disconnecting the vapor hose from the PCV valve, remove the PCV valve. 2. Reconnect the PCV valve to the vapor hose. 3. Inspect the PCV vlave operation. (1) Run the engine at idle. (2) Put a finger on the open end of the PCV valve. (3) Make sure that intake ...