Skip the auto shop - Our mechanics make house calls

Q: Door locks and unlocks, lights came on by themselves

asked by on

My Trans Sport Montana has been doing the strangest things lately. My car is haunted, but it's really an electrical problem. On the passenger side of the car both of my power windows quit working. The thermometer on the overhead started to show the incorrect temperature. The display for my radio doesn't work very often. Most of the time there is nothing on the screen. But the radio works OK. While I'm driving the power door locks start to lock and unlock by themselves. This can go on for 10 minutes then it stops. My horn started honking in the middle of the night on its own in a sporadic pattern. I had to go pull out the fuse to get it to stop. Then my daylight lights came on in the middle of the night. My neighbor called me to tell me I had left my lights on. I tried everything that the owner’s manual said to do and nothing worked, so I pulled out the DRL fuse. I checked all the fuses, the relay in the cab, under the hood, had the battery tested and checked the engine ground cable. They were all OK. It looked like the bottom of the box came off in the underhood panel. I had pulled out both fuses from there. Is the bottom panel gone or is this normal? How do I change the panel out? Do the wires connect with plugs or require soldering? Do you know or have any suggestions on all of this?

A: Hello there. Random electrical faults such ...

Hello there. Random electrical faults such as this are usually pretty rare. With this many faults and systems affected, it points to only a few possible causes. The most likely would be a body control module, wiring short, or a wiring harness fault. These intermittent electrical issues can be difficult to diagnose, especially for the interior where all the wiring is hidden. Have a qualified technician, such as one from YourMechanic, inspect this electrical issue if you need further help scoping out the 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

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: Headlights do not work.

Hi there. Depending on where the coolant sprayed out when the radiator hose came off will depend on what failed. If the lights had the coolant on them, then the light itself was shorted out. If the coolant went into...

Q: When I open my doors the interior lights don't come on.

Hello. Without knowing the make and model of your vehicle, it hard to definitively give insight on the exact component that has failed. In general, when the door is opened, the switch turns on the interior lights. If the lights...

Q: Having a hard time with the doors locking or not locking

Keyless remotes for the Volkswagen Jetta have been known to act erratically when the batteries are getting low or the remote is defective. First, try replacing the batteries in your remote and verify that the problem is fixed. If problem...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
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...
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.