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?

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

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・Fair and transparent pricing

Get a quote

What others are asking

Q: Low beams not working

If the headlamp connector is plugged into the new unit, everything should work as designed. Looking at the wiring diagram for your vehicle, I see that the right hand and left hand low beams use separate fuses, so a blown...

Q: p241a read on scanner.

Hi there. Check the plugs on the O2 sensors and see if they are swapped. This will cause the fault code to come on. If the wiring is correct, then the wiring could have a break in it on the...

Q: How do I lock the doors with the keyless entry?

It’s very easy to lock the doors with the keyless entry system. To do so, first close all the doors, then press and hold the 7-8 and the 9-0 buttons at the same time.

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...
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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...