GL Class (X166) 2013-2015 after facelift became GLS (X166)

Headlight LED issue

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Old 01-24-2024, 07:39 AM
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GL63 AMG
Headlight LED issue

Hi guys,

Newbie here needing a bit of help.

I have a 2014 GL63 AMG. The led strip in the passenger's side headlight has gone really faint/dull and I'm getting warning lights on the dash "intel light system inoperative" and also a front left parking light fault.

I tried changing both ballasts and also took it to a local Mercedes coding guy but no luck.

I'm thinking I need a full headlight?

Has anyone had this issue before, can the strip be repaired or do I need a new headlight (anyone have one for sale)? P/N a1668203659


Dull LED strip.

​​​​​​


Driver's side - how it should look.


Old 01-28-2024, 08:59 PM
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By ballast do you mean the actual HID ballast or the other box head light control unit?
Old 01-29-2024, 03:23 AM
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I tried both of them (one on the rear of the unit and the smaller one underneath).

Neither worked unfortunately.
Old 01-30-2024, 08:22 AM
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If you figure it out even if the cure is replacing the headlight, please come back and let us know. Far too many people come here looking for a cheap fix and never share their knowledge if the answer was not here. Please do not be that guy or gal.
Old 01-30-2024, 09:05 AM
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2003 E320 4matic wagon
Had the same error message on my 2014 gl550 but w/o dim LED symptom and with steering wheel tracking non-functional.

Inspected both headlight assemblies, removed LED bulbs, manually moved the rotating headlamp assembly left to right numerous times slowly to verify full range of motion. Took opportunity to put in new bulbs and viola it was operational again. The headlamp tracking mechanism had some kind of crud buildup on the rack gear and manually (and gentle) moving it side to side corrected it.
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Old 02-23-2024, 04:14 PM
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2014 GL 550
2014 GL 550

The question I have is for the headlight, should the section beside the HID round light be working or does anyone what it is for? Thanks.
Old 02-23-2024, 04:17 PM
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I am referring to the left side of the round HID light, what is it for and function
Old 03-12-2024, 06:46 AM
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Update - The LED strip is powered by the module on the top of the headlamp unit. A chinese copy part got it working again. Anyone facing this issue - Before you do anything, swap your drivers and passengers modules to check.
Old 03-12-2024, 07:08 AM
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Originally Posted by SM86
Update - The LED strip is powered by the module on the top of the headlamp unit. A chinese copy part got it working again. Anyone facing this issue - Before you do anything, swap your drivers and passengers modules to check.
yes I have said this over and over
swap right/left parts

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