Skip the auto shop - Our mechanics make house calls

Q: Automatic door locking system issue

asked by on

My car has an automatic door locking system. Lately, it started malfunctioning. I had a fuse replaced and now it works but only intermittently. How can I fix this permanently?

A: A Mercedes of your model year use a combina...

A Mercedes of your model year use a combination electric/vacuum door lock system. The fuse was for the electrically powered vacuum pump only. The rest of system uses rubber vacuum lines which leak when old. You can replace them one at a time as they fail or leak, or all at once - a more expensive, but one-time repair. A YourMechanic professional can help diagnose the locks and repair this problem.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: 2010 Mercedes-Benz S400 Hybrid

Hello. It sounds like the car has low battery voltage. Either the battery has gone bad or the alternator is not charging properly and is draining the battery. I would suggest that you have the electrical system inspected. If you...

Q: Loud buzzing before the engine cranks

This sounds like the starter solenoid - the part of the starter assembly which acts as a high-current power relay for the starter motor - has worn or burned contacts. This makes it tougher to get adequate power to the...

Q: Takes 3-7 tries before engine stays running

Hello. The symptoms you are experiencing, hard starting and an unstable idle speed, can be caused by a variety of issues. You mention that you replaced a few parts, namely ignition components, so they should be alright. The next things...

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...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...