Hyundai Sonata: Auto Head Lamp Leveling Device / Auto Head Lamp Leveling Unit Troubleshooting

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

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 ...

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