Q: With car off, exterior and interior lights start flashing

asked by on

The battery in my car was replaced just less than a year ago. I had gone home during the day for a couple of hours and when I returned to my car the headlights and tail lights were flashing, plus the interior lights in the car cabin were also flashing. I tried to start the car, but it would not start. The radio and windows were working, along with other things in the car, but it would not start. When I turned the ignition, it sounded like the electronic fuel pump was engaging, but when continuing to try to start the car, nothing happened. Also when I try to start the car, it does not have that usual clicking noise you usually hear; there is only a humming noise. Later, the exterior and interior lights stopped flashing. But every time I open the driver’s door and when I turn the key, the lights start flashing again. The headlights were not on when I turned off the car. I found that the battery post’s positive cable was extremely loose. I tightened it and jump-started the battery, but that did not help the problem. What is causing this problem in my car?

It sounds like somehow the anti theft system was activated and drained the battery. Try locking all of the doors from the inside and close them. Then lock, unlock, lock and unlock the doors to see if the problem persists. You will likely have to get the battery charged and tested.

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

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. With car off, exterior and interior lights start flashing

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: Windshield wipers have stopped working

Hi, thanks for writing in. If your windshield wipers are no longer working, it is possible that the motor has failed or a fuse has blown. I would first recommend having the fuse checked to make sure that it has...

Q: Stability Light came and Check Engine Light came on. I have a misfire on number 6 plugs.

Your car is equipped with wheel speed sensors at each of the four wheels which monitor wheel speed while relaying this information constantly to the ABS and traction control system which are controlled by the car's ECU. When the ECU...

Q: When i put my Car in drive or reverse i lose power but in park or netural the voltage is normal

Hello there, many faults will cause your battery light to be on when your 2005 Ford Crown Victoria is in drive or reverse. You have done well in replacing parts so far, but the vehicle must be diagnosed fully before...

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...