Q: 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?
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. Q: 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: Q: how often do i change my oil

My service manual says to change oil and filter every 13,000 miles or 12 months. You should verify this in the owners manual and with a local dealer just to verify.

Q: Engine light fault. There was a bad spark plug and a failed ignition coil. Replaced both the coil pack or spark plug.

Hi there. If the light is coming on then shutting off and returning on, then if the issue is for the same coil, there could be an issue with the wiring on the coil plug. Check the wiring on the...

Q: My directional lights only works when my lights are off

It sounds like you may have short in the electrical system. It will require testing to determine the location of the fault. I suggest having a certified technician, like one from YourMechanic, perform tests to diagnose the issue with your...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.