Q: Head lamp stays on

asked by on

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.

Hey there, thanks for writing in about your 2010 Mercedes-Benz R350. Have the control module under the driver’s seat checked to see if any water was introduced and has gotten it wet. If it has, then the A/C drain hoses for the evaporator drain are clogged or blocked in some way and the water is getting the module wet resulting in different problems with the lights and radio. For this situation, I recommend having a qualified professional, such as one from YourMechanic, inspect your battery draining issue first in order to get the electronics of your car working again.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Head lamp stays on

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

Get a quote

What others are asking

Q: Towing alarms stays on

This vehicle should come equipped with the button to turn off the towing alarm. The owners manual will show where the button is located in picture form. With the alarm staying on, this may indicate a wiring issue or that...

Q: Towing alarms stays on

If you turned it off and it is still going off on your 2006 Mercedes Benz R350, then you have a problem in the computer system and will need to have the vehicle taken in for service of the computer....

Q: Battery is working and the electrics are not working

From reading your complaint, it sounds like you have plenty of battery power but your engine still won't turn over. If this is the case, then your car may have one of several problems. Other owners have had body control...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...