Q: Head lamp stays on

asked by on June 28, 2016

My Mercedes's right headlamp stays on all the time and drains my battery. The dealer can figure out what is wrong. The low voltage causes the radio not to work. This is so frustrating. Can you think of any way to fix it? I am tired going to the dealer. Thank you.

Headlight is not working Inspection $79.99 - $89.99 Get a Quote

A few faults can cause the vehicle to have a headlight that remains on. The most common problems include a wiring short to power, switch issue, or the headlight itself.

If you’d like to get this fixed and you’re tired of going to the dealer, consider having the vehicle serviced by a qualified technician who will be able to diagnose the issue with your headlight. The necessary repairs can be made once the problem has been pinpointed.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

What others are asking

How do I turn on the daytime running lights?

The daytime running lights are dimmer versions of the headlights. The will come on automatically when the vehicle is turned on, the parking brake is released, and the headlights are not turned on.

Engine whines, knocks, and has slow acceleration

Hey there. I would suggest you have a mechanic come and listen to the noise and verify the noise you hear. The engine may be making normal noises. You may be hearing the idle control and air pump noises that...

How do I flash the high beams?

You can flash the high beams to get someone’s attention, or to alert other drivers. To do so pull the turn signal lever towards you, and then release it. The high beams will flash on and then off, and the...

Continuous camshaft adjustment (LEFT): Incorrect position of the exhaust camshaft (P0025)"

The P0025 code is telling you that the exhaust camshaft timing is running late. This is not necessarily a sensor issue, but more likely a mechanical one. The variable camshaft timing is controlled by a hydraulic device that is part...

How do I customize the Vehicle Locator Lights?

The vehicle locator lights can be turned on or off with just a few steps: 1. Turn on the infotainment system. 2. Press the CONFIG button to select the Configuration Settings menu. 3. Rotate the MENU/SELECT knob to Vehicle Settings,...

Car keeps stalling when I press on the brakes

Your car has a unit in the fuel injection system called an idle air control valve. The idle air control valve monitors the air intake as it is mixed with fuel prior to being injected into the engine. This valve...

Adding park assist - 2014 Mercedes Benz CLA250

The car may or may not have the basic infrastructure to support this feature. Most established auto manufacturers do not support "field modifications" such as this for warranty and reputation reasons. Look for an automotive customizer in your area that...

Oil cooler leak in 2002 Mercedes-Benz S600

Hi. A leaking engine oil cooler is considered an oil leak and can cause damage if the engine oil level is not maintained. Have the engine oil cooler replaced by an experienced technician. Have the technician inspect the vehicle for...

Excessively high voltage in Throttle Position Sensor

I'm not sure why you are getting such a high voltage, but you are making one mistake when checking TPS voltage. The ECM sends a 5 volt reference voltage to the TPS which passes through a variable resistor of the...

Related articles

What Are Xenon Headlights?
You’ll You’ll hear a lot of names bandied about when discussing headlights – halogen, xenon, “super blue,” and HID are just some of them. If you’re thinking about replacing your headlights and are looking for something that’s both higher performing...
What to Do If Your Car Switches Get Wet
Your car switches are electrical components. They operate internal and external vehicle functions that require low currents in some cases...
Are Colored Headlights Safe and Legal?
Most Most vehicles have standard headlights that emit yellowish light. However, there are bulbs on the market that are different colors. They’re marketed as “blue” or “super blue,” and there is a great deal of uncertainty around their safety and...