What is the low beam headlight bulb size for a 2015 Mercedes-Benz GLK350?

The 2015 Mercedes-Benz GLK350 uses a H7 bulb for the low beam headlights. We recommend upgrading to LED for better visibility.

What is the high beam headlight bulb size for a 2015 Mercedes-Benz GLK350?

The high beam bulb size for the 2015 Mercedes-Benz GLK350 is H15.

Why are my 2015 Mercedes-Benz GLK350 headlights dim?

Dim headlights on a 2015 Mercedes-Benz GLK350 can be caused by aging halogen bulbs, which lose brightness over time, or oxidation (cloudiness) on the plastic headlight lenses. Upgrading to a H7 LED conversion kit can provide a significantly brighter and whiter light output.

Which bulb fits the 2015 Mercedes-Benz GLK350 fog light?

The 2015 Mercedes-Benz GLK350 typically does not come with factory fog lights in all trim levels. If your vehicle is equipped with them, check the manual as sizes can vary by trim.

Is the 2015 Mercedes-Benz GLK350 single or dual beam?

The 2015 Mercedes-Benz GLK350 uses a dual bulb headlight system. This means you have separate bulbs for high and low beams.

Can I install LED bulbs on my 2015 Mercedes-Benz GLK350?

Yes, the 2015 Mercedes-Benz GLK350 comes with standard halogen bulbs from the factory, but they can be upgraded to LED. You will need a H7 LED conversion kit for the low beams.

Did the 2015 Mercedes-Benz GLK350 change headlight bulb sizes from the previous year?

No — the 2015 Mercedes-Benz GLK350 uses the same bulb sizes as the 2014 model. This configuration has been consistent across the 2013–2015 generation.

Is the 2015 Mercedes-Benz GLK350 the first or last year to use H7 bulbs?

The 2015 Mercedes-Benz GLK350 is the last year in the 2013–2015 generation to use the H7 bulb for the low beam headlight.

How do I change the headlight on a 2015 Mercedes-Benz GLK350?

Turn off the vehicle and open the hood. Locate the headlight assembly from behind, remove the dust cover or retaining clip, disconnect the wiring harness, twist the old H7 bulb counter-clockwise to remove it, then insert the new bulb and reassemble. Note: Mercedes-Benz vehicles use a CANbus system, so LED replacements may need an anti-flicker decoder. The whole process typically takes 10 to 30 minutes per side depending on accessibility.

Are LED headlights legal for a 2015 Mercedes-Benz GLK350?

LED bulbs used off-road or in auxiliary lights are legal everywhere. For on-road headlight use, legality varies by state. Many states allow LED retrofits as long as the beam pattern meets DOT standards. For the best legal compliance, choose a DOT-approved H7 LED kit that is designed as a direct replacement and produces a proper cutoff pattern without excessive glare.

How much does it cost to replace 2015 Mercedes-Benz GLK350 headlights?

A pair of halogen H7 bulbs costs $15 to $40, while LED conversion kits run $25 to $60 per pair. If you have a shop do the work, expect an additional $20 to $50 in labor per bulb. Replacing them yourself at home saves the labor cost and usually takes under 30 minutes.

What is the difference between halogen and LED for a 2015 Mercedes-Benz GLK350?

Halogen bulbs produce a warm yellow light (around 3200K), last 500 to 1000 hours, and draw more power. LED bulbs emit a brighter white light (5000-6000K), last 25,000+ hours, and use less energy. LED upgrades for the H7 position are available as direct plug-and-play replacements. Since the Mercedes-Benz uses CANbus monitoring, choose a CANbus-compatible LED kit to avoid dashboard errors.

The 2015 Mercedes-Benz GLK350 is the last model year to use this bulb configuration (2013–2015).

Fitment Guaranteed for 2015 Mercedes-Benz GLK350

What Size Bulbs Does a 2015 Mercedes-Benz GLK350 Use?

Correct headlight, fog light, and tail light bulb sizes. Sourced from OEM catalog data.

Installation Difficulty

Hard (Tight clearances)

Est. Replacement Cost

$15 - $40 (Halogen) / $30+ (LED)

What Lighting System Does the 2015 Mercedes-Benz GLK350 Have?

Lighting on the 2015 Mercedes-Benz GLK350 is managed by a total of 5 bulbs, covering everything from primary headlights to signal indicators. It features a standard lighting system powered by a dual-bulb halogen configuration using separate H7 low beam and H15 high beam bulbs for precise light distribution. This model belongs to the late years of the GLK350's 2010-2015 production span. Note that Mercedes-Benz vehicles typically feature a CANbus electrical monitor that checks for specific bulb resistance.

LED Flicker Warning

This vehicle is known to use a CANbus system. Installing standard LEDs may cause flickering.

Use a CANbus decoder.

Can You Put LED Bulbs in a 2015 Mercedes-Benz GLK350?

Upgrading to LED is one of the most effective ways to modernize your Mercedes-Benz's appearance and safety profile. We recommend starting your upgrade with the H7 low beams, as they see the most use. Adding a matching H15 LED kit later will complete the look and ensure consistent lighting performance. Because Mercedes-Benz utilizes a CANbus system, standard LED bulbs may cause "bulb out" errors on your dashboard. Always opt for "Error-Free" or CANbus-ready kits which include the necessary resistors.