I was driving home from work on a Friday night and noticed the interior lights in my car were not turning off.
When I got into the car, I turned them off, but then they came back on again. It’s been like this for about a week now, and it isn’t very pleasant.
I haven’t had any problems with my car before this, so it must be something simple that can be fixed easily by someone who knows what they are doing (i.e., you).
Ford Focus Interior Lights Won’t Turn Off [ 7 Reasons]
Check the Door Ajar Switch
If your ajar door switch is functioning correctly, it should not allow the interior lights to turn on when a door is opened. If the switch doesn’t work or has been damaged, it may cause an electrical circuit fault that prevents the interior light from turning off.
To check for damage to this part:
Open each one of your doors and look at the wiring harness connected to the door jamb. Ensure all wires are intact and none have been severed or cut. Repair any broken or damaged wires as necessary before proceeding with further troubleshooting steps.
Open each one of your doors again and check which two wires connect to each other so that they both glow when you open a door (such as if you were connecting them instead).
Remove these two wires from their respective terminals on the door jamb and then test each individual wire with an ohmmeter (the device used for testing continuity).
Ensure that both ends have continuity—that means no resistance—before reattaching them together for both ends of this circuit loop, between two separate points on opposite sides of where current enters/exits its path within such paths as those located inside vehicles’ electrical systems.
Check or Replace the Bad Dimmer Switch
The dimmer switch can become damaged over time and cause your interior lights to stay on.
If this is the case, you will need to check for any signs of damage, such as cracks in plastic or damage to a wire connecting it with the power source. If you see any signs of damage, you should replace the dimmer switch using new parts from an auto part store near you.
Check and replace interior light fuses if blown out or shorted out by an electrical short somewhere else in your vehicle’s electrical system (such as an under-the-hood fuse box).
Check Interior Light Fuses
Check the interior light fuse. It is located in the engine compartment beneath the dashboard.
If you have an older model Ford Focus, the interior light fuse is behind a cover on your dashboard on the left side of your steering wheel (if you are sitting in it). Remove the cover by pulling it off gently with your hands.
For newer model Ford Focuses, there’s usually a fuse panel near where you would normally find an airbag under your hood, on either side of the firewall leading into your
cabin from under the car.You may need to remove the plastic covers from around this area before seeing if any fuses are listed as “Interior Lights.”
Check the Headlight Switch
The headlight switch may have failed, or the bulbs may not be getting power.
- Check for power at the headlight switch. If you have control of the switch, check for continuity on each bulb socket and ground (see step 2). If there is no continuity, replace the BCM (see below).
- Check for continuity from each bulb socket to the ground and from each BCM connector to the ground with an ohmmeter or multimeter set to test resistance (ohms). Replace any components that do not have continuity as described above.
The Multifunction Switch Is Broken
The multifunction switch is a common cause of inside car lights that won’t turn off. You might have hit it with something, or maybe it was broken when you bought your car. The multifunction switch controls all the lights in your vehicle, including the dome light, headlight, and front/rear marker lights.
The door-activated switch isn’t always the same as the multifunction switch; sometimes, they are separate pieces altogether—if you try turning on one but nothing happens, check to see whether there’s another version of this component in your car. Just because one doesn’t work doesn’t mean neither will!
You Have a Short Circuit
If you have a short circuit, the resistance of your car wiring will be too low to allow the current to flow through. The result is that it doesn’t matter how much you push the headlight switch; nothing happens.
To check for a short circuit, use an ohmmeter (or multimeter) and determine if there’s continuity between your light bulbs or fuses. Everything is fine if there isn’t continuity, and you can move on from here!
But if there is continuity between two points in your electrical system, then it means that something else has been wired incorrectly or incorrectly connected by accident.
You will need to figure out where exactly this unwanted connection has occurred so that it can be fixed before driving away again with those pesky headlights still on!
Failure to Close Door Properly
If your car’s inside lights don’t turn off, it could be due to a faulty door latch. When the latch is not closed correctly, the door may not be fully closed and therefore cannot be locked.
The result is that when you try to lock your car, the interior lights stay on because they were turned on before you closed the door.
To check if this is your problem, open a door and inspect its latch mechanism. If it looks like something has broken or torn off from around or near where you would generally slide your key into, then this may be why your doors won’t go completely shut.
If all is okay, then BCM (Body Control Module) may need replacement
If you have all of your interior lights, but they won’t turn off, then it is possible that the BCM (Body Control Module) needs replacement.
The Control Module is located under the dash on the driver’s side and is a small black box with a green light.
If this control module is damaged or faulty, it will cause your car’s electrical system to malfunction in various ways, including this particular issue.
The good news is that it isn’t difficult to diagnose whether or not this component needs replacing: simply take your car into an auto shop for them to test it out!
However, note that if you do find out that it does need replacement—which can cost upwards of $1,000—it may still be worthwhile for you to get another opinion before making any decisions about whether or not you want to invest in getting it fixed at all!
How to Fix Faulty Inside Car Lights?
If your inside car lights don’t turn off, there are many different reasons why this might be happening. Some of these reasons are more serious than others. If you need help figuring out how to fix your inside car lights, you can call professional help.
The car lights are stuck on.
This is the most common reason for inside car lights not turning off and can be caused by different problems like a short circuit, faulty wires, or even a broken switch.
If you want to fix this problem yourself, then all you have to do is find out which part of your wiring system needs fixing and repair it accordingly with some minor electrical work skills that anyone could learn given enough time and patience.
The car lights aren’t the problem.
Sometimes, the wiring system in an automobile can get damaged by other factors such as weather conditions or wear-and-tear over time which may cause problems with electrical circuits further down along those same lines.
If this happens, then these problems will show up first as an issue with turning off/on before anything else does. Because it’s easier for them both physically speaking as well as financially speaking.
Since most people don’t expect their car stereo systems would ever die when they are still driving them around every day without thinking twice about whether or not they will need repairs at some point down the road!
Final Words
The interior lights may not turn off on your Ford Focus. This is a problem that a few different things can cause.
Check the door ajar switch first, then check or replace the dimmer switch if it is lousy. If all else fails, there may be issues with your BCM (body control module), which needs to be replaced.
If you have issues with your interior lights not turning off, try the above steps to troubleshoot the problem. If you can’t find a solution, consider getting an expert opinion from a mechanic specializing in Ford vehicles.
If you have any other questions or concerns, please write in the comments below, and we’ll be happy to help!
We hope this article helped you better understand what is causing your issue so that you can fix it quickly and effectively.