The Toyota Mirai is a hydrogen-powered sedan.
It has its fair share of tech goodies, many of which use various beeps, tones and chimes.
If you’re Mirai keeps beeping, this article is here to help.
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Toyota Mirai Beeping
The most common causes of beeping on a Toyota Mirai is weight on the passenger seat Other causes include headlights left ON, faulty ignition or headlight switch, the dashcam, low 12V battery or a low key fob battery.
1. Seatbelt Alarm & Weight on Seat
The seatbelt alarm is a known suspect for annoying beeps.
There might be a faulty sensor that isn’t recognizing that your seatbelt is fastened.
Alternatively, you may have some weight on the passenger seat like groceries, a backpack or your dog which is triggering an alarm.
In which case you can try fastening the passenger seatbelt.
2. Headlights ON
If you have left your headlights on then you will hear a warning beep, this is so you don’t drain the battery.
3. Faulty Headlight or Ignition Switches
A faulty headlight switch or a faulty ignition switch may be the cause of the beeping.
Since the headlights being on, or the key being in the ignition will cause the chime to sound, one of these switches may have a loose connection or be faulty.
4. Key Fob Battery
Make sure your key fob battery isn’t running low, try swapping out the battery.
Ensure the battery is inserted correctly and the inside of the key fob is free from dirt and dust.
5. Dash Camera SD Card Not Inserted
If you have the Toyota factory installed dashcam you’ll likely hear this beep on startup.
You won’t see any warning lights come up on the dash, however, if you look behind your rearview mirror where the dashcam is located, you will see the dash camera flashing.
If you see an error flash, you may notice the micro SD card has not been fully inserted into the camera.
By pressing the SD card into the dashcam, this should stop the beeping.
However, if the SD card is in and it’s still beeping, press and hold the ‘action’ button while you turn on the car.
- Make sure the vehicle is completely off
- Make sure you are parked on level ground
- Make sure the camera has shut off
- Press and hold the action button
- Then start your vehicle
By doing so you will recalibrate your vehicle.
You should hear a couple of beeps and see a green light and you’re good to go.
6. Navigation Alerts
Many mysterious beeps can be attributed to navigation alerts and this is common on many vehicles.
You can disable the navigation or the navigation alerts to see if the problem goes away.
7. Dashcam Beeps
If you have a dashcam equipped, check to make sure it’s not the source of your beeping. If you hear the beep after going over a bump or a rough patch of road etc. then this is likely the dashcam recording an incident notification. You will need to adjust the sensitivity and/or volume settings.
8. Faulty latches Or Switches
If you are experiencing beeping whilst driving your Mirai, this may be caused by a faulty door switch or latch, if you have a ‘door ajar’ light on the dashboard then this is almost certainly the case.
Faulty latches are quite common – you may need to have it replaced although you should first try giving all latches a good clean and spraying with something like WD-40.
Similarly door switches can fail over time – they report the open/closed status of the door and might be sending false readings to the cars computer.
9. Spare Keys Left in Vehicle
If you’ve left a spare set of keys in your Mirai you may hear a warning beep when you go to lock the vehicle as it thinks you are trying to lock the keys in the car.
10. Phone Alerts
Your phone could be the source of your beeping, especially if it is connected by Bluetooth.
11. Weak 12V Battery
A weak 12V battery can cause a myriad of problems.
To rule this out of the equation, simply have a battery health check performed.
These can be done at AutoZone for free.
Also check to ensure the connections are tight and free of dirt and grime.
12. Electronic Devices Inside or Outside of The Car
The beeping may not actually be coming from your car.
Do you have any other electronic or battery-powered devices in your vehicle or your garage that could be causing the beeping?
Usually, it’s their batteries going bad – For example, a garage door opener, a smoke alarm, a carbon monoxide detector, or a dropped wristwatch.
13. Aftermarket Devices
If you have an aftermarket alarm system or an aftermarket stereo fitted these could be the source of the beeping.
You can try disconnecting them to see if the beeping stops.
Other Common Beeping Causes
- Door / rear hatch open or not closed properly
- Traction control (beeps when it activates)
- Exceeding speeds set in cruise control
- Low air temperature outside and possibility of ice on the road
- Door is open and key is ignition
- Seatbelt not fastened
- Headlights on / key in ignition when door is open
- Low fluids e.g. windshield waher fluid
- Reversing (in some cases)
- Spare set of keys locked in car
- A warning / error condition on the instruments
- Low fuel
- RSA (road sign assist)
- Lane Sway Warning (excessive swaying within the lane markings)
- Lane Departure Alert
- BSM (blind spot monitor)
- ICS (Intelligent Clearance Sonar)
- Park Assist
- PCS (Pre-Collison System)
- Damaged electrical wiring (possibly chewed by rodents)
- Water ingress / water damage
Check for Recalls or TSBs
By entering your car’s VIN number on Toyota’s recall page or the NTHSA’s Safety Issues & Recalls page you can determine whether or not there is a TSB or recall for your vehicle and if there is you’ll want to get it addressed.
A recall is issued by a vehicle manufacturer for issues that are safety-related, while a TSB covers components that may be malfunctioning but don’t compromise the safety of the vehicle.
Watch the Dash Display
This could give you a clue about what’s causing the beeping.
Also, keep an eye on the radio / infotainment screen, this might give a clue too.
Disconnect the Battery
Sometimes mysterious beeping problems can disappear with a simple reboot, there are no guarantees here but it’s worth a try.
Disconnect the battery for 20 seconds and this resets many of the electronics in the vehicle.
Check For Warning Messages
When the beeping occurs can you see any lights or warning messages on the instrument panel?
This can give a clue as to what’s causing the beeps e.g. ‘Door Ajar’.
Take it to a Toyota Dealership
If needed, take your Toyota to the dealership.
- Tell them you are NOT paying for a check on what the problem might be.
- Ask them if they will check it for free.
- Most dealerships and other places do quick/initial diagnosis for no money as they plan to make money for the repair of your vehicle.
- If your unit is still under warranty then they should fix and resolve the issue for free.
Diagnosing Beeps With a Scanner
Another possible option, if you’re hearing a beeping sound, is to use an OBD2 diagnostic scanner tool.
These are fairly easy to use, you simply plug them into your car – there’s usually an OBD2 port under the steering wheel.
Once you have the scan codes you can research these online specifically for the Mirai.
There are also OBD apps available so you can connect your car straight to your smartphone (either with a cable or Bluetooth) without even needing a scanner.