Hyundai Sonata LF: Body Electrical System / Auto Head Lamp Leveling Device

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

Components and Components Location

Component Location

1. Head lamp leveling actuator (Built-in Head lamp)

2. Head lamp leveling unit (Rear right only)

Auto Head Lamp Leveling Unit Schematic Diagrams

Circuit Diagram

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 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 the operation does not work well, inspect the connector and terminals to be sure they are all making good contact. If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system. If the terminals look OK, go to step 5.

5.	Substitute with a known-good head lamp assembly and check for proper operation.

Removal

1.	Disconnect the negative (-) battery terminal.

2.	Disconnect the head lamp leveling unit.

3.	Remove the head lamp leveling unit linkage (A).

4.	Remove the head lamp leveling unit assembly.

Installation

1.	Install the head lamp leveling unit.

2.	Reconnect the head lamp leveling unit connector.

Auto Head Lamp Leveling Unit Troubleshooting

Inspection with GDS

Initialization and diagnosis sequence by using GDS equipment.

Below content summarize the procedure for A/S using GDS.

No	Procedure
1	Locate vehicle to flat plane
2	Tire check
3	IGN1 ON
4	Head lamp Low Beam ON
5	Connection with diagnostic tool
6	Initial command by diagnostic tool
7	Clear DTC Code
8	IGN1 OFF > ON
9	Re- Connection with diagnostic tool
10	Checking of HLLD output value as 15% and DTC Code
11	HLLD actuating by diagnostic tool command
12	Head lamp mechanical Initial Aiming

1.	There’s no load in vehicle and vehicle should be on flat plane.

2.	Should check of HLLD output value (15%) after initial setting.

3.	Should do first electrical initial setting by diagnostic tool and then mechanical aiming afterward.

1.	Select the vehicle model and "Auto Head Lamp Leveling System (AHLS)"

2.	GDS can operates actuator forcefully, input/output value monitoring and self diagnosis.

3.	To perform functional test on AHLS outputs, select "Actuation Test".

4.	Select " Parameter setting & Zero Position Initial".

5.	Confirm that AHLS operate forcefully in "Head Lamp Leveling" menu.

6.	To check the DTC of the head lamp leveling system, select "Diagnostic Trouble Codes"

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