The Honda CR-V is one of the best selling SUVs on the market.
Like any other other vehicle, the CR-V’s alarm may go off at random for mysterious reasons.
If your CR-V alarm keeps going off, this article is here to help...
Table of Contents
Why Does My Honda CR-V Alarm Keep Going Off?
A Honda CR-V alarm can be triggered by a faulty hood or door switch, key fob issues, 12V battery issues, electrical faults (wiring or BCM), accidental press of the panic alarm and not closing a door/hood/trunk properly.
1. Faulty Hood Switch
A faulty hood switch is a common cause of unwanted alarms on the Honda CR-V.
The switch is typically integrated into the hood latch.
The small electronic device is designed to detect whether the hood is open or shut and is an important part of the car’s alarm system – if it is broken, loose or dirty it can send false readings to the car’s computer thus triggering the alarm.
- Pop the hood and locate the hood switch.
- Check for any obvious damage, rust or loose connections.
- Give the hood switch a clean too (use contact cleaner), as dirt and grime can cause issues.
Have your dealer run a scan for the cars alarm history, it should show the trigger point and may point to the hood latch sensor being the culprit.
If you’re mechanically inclined you can buy a replacement hood switch online and fit it yourself or the easiest option is to have your dealer take a look.
Here is what owners had to say on crvownersclub.com:
“I know of a few people who had this issue on their Pilots and it was the hood latch sensor.”
“Turned out to be the hood pin switch. It was set so close to turn on that when the wind blew the alarm would go off…”
“I’d unplug the hood sensor and try it.”
Another owner shared this tip on reddit.com/r/crv:
“Check for continuity [with a continuity tester] on the hood latch switch or tailgate latch switch if you want the alarm on.”
2. Faulty Door Switches
Faulty door switches (including the rear hatch) are another common cause of random alarms on the CR-V, similar to the hood switch, these switches monitor the open/closed status of the door – if damaged, faulty or dirty they can send false readings thereby triggering the alarm.
Door switches are a common point of failure as they are subject to wear and tear due to the doors being continually opened/closed/slammed etc.
The door latches and door switches can get dirty too which can cause issues, so the first thing you should do is give all door latches a good clean and spray some WD-40 on the latch and work it in to see if that helps.
Also check the wiring leading from the body into the door for any signs of damage, it should be in a flexible hose on the hinge side of the door.
If you suspect the alarm issues are linked to the door switch, ask your dealer to run a diagnostic test to try and pinpoint the fault.
Here is what owners had to say on crvownersclub.com:
“Likely one of the door or hatch hood switches or not closing properly. Using a rubber mallet or steel toes tap areas around switches with alarm fully armed, the culprit should give it up…”
“Check your door position switches. Do they feel loose and broken?”
3. Key Fob Low On Battery Or Dirty
A common cause of mysterious alarms on the CR-V is a low key fob battery. Similarly, if the fob is dirty or dusty this can also cause alarm issues.
Give the inside of your fob a clean and replace the battery to eliminate this possible cause. It’s worth spending a bit extra for a good brand of battery.
- To open your key fob, stick your prying tool into the slit or gap between the two halves of the outer casing and gently apply upward pressure to pop open the device.
- Remove the battery.
- Give the key fob a good clean to remove any dirt or fluff – a cotton swap and some rubbing alcohol should do the trick.
- Check for damage, rust or loose connection (you may need a new key fob depending on what you find)
- Be sure to insert the new battery facing the right way up.
- Assemble the outer casing of your key fob by clamping them back together.
Here is what owners had to say on reddit.com/r/crv:
“SOLVED – I wanted to follow up in case anyone else is ever in this situation. We ended up leaving the car unlocked overnight and then tried replacing my fob battery the next day at the suggestion of a tow truck driver. No issues since. I think because the CRV was parked so closely to our room, the fob’s low battery was triggering the alarm.”
4. Faulty Key Fob
Another reported cause of nuisance alarms on the CR-V is a faulty key fob.
If you have 2 remotes, try taking the battery out of one and use the other for a while.
If the alarm problems persist, and you have tried cleaning the inside of the fob(s) and changing the battery, the best thing to do is speak with your dealer.
5. Drained 12V Battery
A faulty or weakened car battery causes a variety of problems, including accidentally triggering the CR-V alarm.
The best thing to do is take your CR-V for a battery health check, these are usually quite inexpensive or sometimes free such as at AutoZone.
Or you can test it yourself with a multimeter (see the guide at the end of this article).
A healthy 12V battery should be about 12.6 to 12.8 volts while a weakened battery reads below 12 volts.
Owners on crvownersclub.com had this to say:
“The first thing to check is the battery voltage…”
“How is the car’s main battery? If it’s flat, it may be triggering the alarm.”
6. Loose or Bad 12V Battery Connections
Loose or bad 12V battery connections can cause a number of problems, including triggering the alarm of your CR-V.
A bad connection can be caused by dirt or gunk buildup.
The terminals may have come loose from driving and vibrations etc.
Make sure the engine is off before doing any work on the battery.
- Inspect the battery and look for any signs of damage, dirt build-up, rust, or corrosion.
- Disconnect the battery and loosen the nuts on the clamps using a wrench
- Remove the negative clamp, marked with a “-” first
- Clean the terminals with a toothbrush dipped in a mix of baking soda and water, rinse with distilled water and dry with a cloth.
- Re-connect the battery, ensuring tight connections
7. Accidental Press of The Panic Alarm
Its not uncommon for owners to accidentally press the panic alarm on the fob, if its in their pocket and they crouch down, have on tight pants or other items in their pocket.
8. Faulty Body Control Module (BCM)
A faulty body control module can cause a wide range of issues including nuisance alarms.
On other Honda models (Civic, HR-V and Pilot) the BCM has been a reported cause of nuisance alarms.
- The BCM is in charge of electrical communication from different electronic systems.
- This includes the car alarm system, lock-unlock functions, climate control etc.
Here’s what owners on CRVOwnersClub.com had to say:
“I resolved the problem. The problem was The BCM. That is a module of the CR-V. You only need to change the BCM.”
If you feel that your BCM is the culprit behind random alarm activation, then book an appointment with your local dealership to have it inspected.
9. Aftermarket Alarm Issues
An incorrectly installed or faulty aftermarket alarm system is a common cause of nuisance alarms.
Aftermarket alarms are typically far more complex than any factory-installed equipment which makes them more prone to issues.
They may also have been installed by incompetent individuals.
If you are experiencing issues with an aftermarket alarm, the best thing to do is speak with a reputable auto electrician.
On crvownersclub.com one owner shared the following:
“Some aftermarket alarms have an internal battery, and when that fails, it needs to be replaced.”
10. Damaged Wiring
Damaged electrical wiring can cause a wide range of problems, it can often be tricky to pinpoint too and you may need to have an auto electrician run some diagnostic tests.
11. Animals Climbing On The Vehicle
If your alarm has been set off in the middle of the night, it may have been by an animal climbing on the car.
Have a look for footprints on the hood and the roof.
12. Not Closing Doors, Hood or Trunk Properly
Sometimes a false alarm can be caused simply by not shutting a door properly, including the hood and trunk.
Related: Honda CR-V Beeping Problems? (7 Causes & Solutions)
Alternative Suggestions
Check for Recalls or TSBs
By entering your car’s VIN number on Honda’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.
Disconnect the Battery or Hard Reset
Sometimes mysterious alarm 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.
Here’s what one owner had to say on CRVOwnersClub.com:
“I called the dealership and asked them how to do a hard reset on the electronics in the car, and the service guy told me to take the two nodes off each port of the car battery and zip tie them together for 20 minutes. After 20 minutes put them back on the battery and turn the car on and sure enough it did a hard reset on all the electronics, been a few hours now and no alarm but it looks like it worked.”
Check For Warning Messages
When the alarm occurs can you see any lights or warning messages on the instrument panel?
This can give a clue as to what’s causing the alarm e.g. ‘Hood Ajar’.
Take it to a Honda Dealership
If needed, take your Honda 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.
How to Test the 12V Battery
How to Test the Battery:
- Before testing, remove the surface charge from the battery, this allows for an accurate reading.
- Simply turn on the headlights for 2 minutes then turn off.
- Set the multimeter dial to the ’20 Volts’ setting.
- Make sure the car is turned OFF.
The multimeter will have a red probe and a black probe.
- The red probe is for making contact with the positive terminal.
- The black probe is for making contact with the negative terminal.
Measure across the battery terminals.
- The meter should display a reading, if the battery is fully charged the voltage should be between 12.2 and 12.6 volts.
- Anything under 12V and the battery should be charged or replaced.
Resources
https://owners.honda.com/vehicle-information/manuals
https://owners.honda.com/help/customer-relations
https://owners.honda.com/service-maintenance/recalls
