2017 honda ridgeline alarm system

It is most likely your hood sensor. In humid or rainy weather it can cause this problem it is dirty or malfunctioning. You can disconnect it on the engine side of the radiator support until you can have it serviced or replace it yourself. If you need pics I can send them of the location of said sensor.

It is located under the plastic cover on the radiator support. I have approximately marked where the clips are located. Just start at one side and gently pull up on the cover working your way across the support. Some of the clips may come out of the cover but I included a pic of the tool to pull them and snap them back into the cover. I also show where it is located and a puc of it unplugged. To disconnect this plug just push down on the release and pull it apart. With this disconnected the car will still lock with you key fob but the alarm will not engage.

Sensor is located here

This the sensor unplugged

If the plugs should come off of the cover instead of out the clips use a tool like this to remove them and reinstall on cover. Also before replacing cover make sure that you put the latch release though the hole in the cover or it will not snap into place

All sounds good but the simple solution to the false alarms is to first make sure all your doors including the hood, tail gate, rear sliding window and trunk are properly closed . Then lock the vehicle using your key in the drivers door ( only spot available) this will reset the security features.

Disconnecting the hood latch sensor will cause the alarm to consider the hood as "always closed". This would solve a case of faulty hood sensor. However, it would not help in case of a faulty door (any of them) or trunk sensor. So disconnecting the hood latch sensor alone is not going to disable the alarm. You can confirm this by checking the flashing alarm diode - it would still indicate the alarm being armed. In order to really disable the alarm, you need to make it think the hood is "always opened". This can be achieved by connecting both electrical contacts within the female part (on the cable) of the disconnected hood latch sensor connector. A solid tip jumper wire (male) is a perfect fit for this job. After that the alarm won't arm itself and the alarm diode won't blink.

I am not a mechanic. I am a carpenter. I know little about vehicle engines. What I do know is I am a long time Ridgeline owner. Periodically, I have enormous issues with my vehicle. The lights come on on their own. The theft alarm engages every hour or so. Just lots of weird thigs start happening. I have even had the engine start. After some research with mechanics (non-Honda) I discovered that Rigelines are notorilusly susceptible to crazy issues when they have a battery that is over 3 years old. Further, all recommended I not get a honda battery because it has lower specs than most of it's peers. Much lower cranking hours, etc. For me, I get these issues about every 3.5 years if I have a honda battery and about a year extention if I use a higher quality AGM battery. I get the COSTCO H6 (48) AGM. $170 It is made by interstate and is almost $100 cheaper than getting it at Intertate. It is the same battery. It is $250 at an auto store. Changing the battery is relatively easy. It is a lot of steps, but none of them are difficult. The battery I take out always tests fine. So I can't get warranty money back. But it always makes the crazy issues go away for me.