Skip the auto shop - Our mechanics make house calls

Q: power locks won't work on 2003 mercury mountainner

asked by on

Just bought a used 2003 mercury mountainner and the power locks won't work, I have checked the fuses, or at least the right fuses. What can cause it to not work?

My car has 153876 miles.
My car has an automatic transmission.

Hello. Thank you for writing in. The first test needs to determine if the power locks work from any of their switches. If both front door panels and the key fob do not unlock the vehicle, then your issue is with the power supply. Issues like this are typically caused by a module issue or miscommunication. The switches utilize an actuator that is controlled by a solenoid. When you press the lock/unlock button, you are making the ground connection to the circuit and allowing the solenoid to energize the system. The fuses will then need to be checked first. If the fuses are ok, then you will want to look into the main control module for the power locks. This unit may have a bad connection, or may have failed altogether.

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!
  1. Home
  2. Questions
  3. power locks won't work on 2003 mercury mountainner

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: Hi Im thinking, my mini needs soon a cloche repair you know how much is it ?

Hi there. A modern clutch system has multiple individual components that must all work together perfectly in order to allow your Mini to shift gears and accelerate. However, there are different procedures for repairing each of these parts and as...

Q: Fuel supply related to engine misfire?

Engine misfires can be caused by a list of problems, but there are a few suspects that occur more than others. Generally, misfires are caused by either a spark or fuel issue or in cases, a combination of both. Spark...

Q: Ignition switch

If you replaced the ignition key switch and now have new keys then you need to have the new keys programmed. If you still have an old key that is programmed then all you need to do is hold that...

Related articles

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...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.