Clubjazz - Honda Jazz & HR-V Forums

Honda Jazz, HR-V & Hybrid Forums => Honda Jazz Mk2 2008-2015 => Topic started by: Lianne on December 30, 2018, 05:13:43 PM

Title: Alarm going off ramdomally
Post by: Lianne on December 30, 2018, 05:13:43 PM
Hi everyone. I have a 2012 jazz automatic. About a month ago my alarm went off ramdomally in the early hours. Later that evening battery was checked and was fine. My key fob stopped working when locking the car then righted it's self. All was fine until Thursday when the alarm went off. Then on my dash board it's telling me my boot was open when it was not. Then last night the alarm went off twice. But fine in the day. Agsin battery checked and fine. Although we got a new one today. Hope someone can help. Many thanks.
Title: Re: Alarm going off ramdomally
Post by: Dayjo on December 30, 2018, 08:25:52 PM
Hi Lianne.
 I had my previous, 2015 auto, for 3 years. Never a problem.

Except.... While away, on holiday. I checked it was all secure for overnight, parking.
 Pulled the tailgate, and it popped to the second catch!

With the alarm blaring, loud. I had to walk back to the chalet, for the key.

I now make sure, the tailgate is properly closed......
Title: Re: Alarm going off ramdomally
Post by: Lianne on January 10, 2019, 06:17:18 AM
After a new battery although it didn't need one. And a new boot latch as we think that was the problem. Has been fine for a week. Now this morning started  going off agsin. It somehow unlocks it's self. Now it's not locking on my key fob again...help anyone had this
Title: Re: Alarm going off ramdomally
Post by: Jaffa Jazz on January 10, 2019, 07:58:41 AM
After a new battery although it didn't need one. And a new boot latch as we think that was the problem. Has been fine for a week. Now this morning started  going off agsin. It somehow unlocks it's self. Now it's not locking on my key fob again...help anyone had this
Hi Lianne
I have given this some thought,perhaps your key fob is the guilty party in this mystery,after all this is the thing that controls all this.
Do you have a second fob that can be used,if so remove battery from existing fob this will render it sterile so to speak.
Worth a try costs nothing. Or is it the spare fob that is being naughty
Hope you resolve this.
Title: Re: Alarm going off ramdomally
Post by: culzean on January 10, 2019, 10:21:35 AM
After a new battery although it didn't need one. And a new boot latch as we think that was the problem. Has been fine for a week. Now this morning started  going off agsin. It somehow unlocks it's self. Now it's not locking on my key fob again...help anyone had this

When you say new battery was that the car battery or the keyfob battery ? A dodgy car battery can affect the alarm as it can see a low system voltage as an attempt to tamper with alarm and activate. If you don't know when battery was replaced maybe time to get it checked, standing voltage an hour after charging or driving should be around 12.6 volts, if it is lower it is a danger sign ( and remember alarm systems are notorious for sucking power out of a battery at standby).

Also I learned to be cautious of cheap keyfob batteries, when my Civic fob started playing up on unlock  and locking I fitted a cheap battery, it did not cure the problem and was a nuisance until I fitted a proper Duracell battery ( 5 ) and no problem since ( 12 months ).
Title: Re: Alarm going off ramdomally
Post by: Jaffa Jazz on January 10, 2019, 12:21:02 PM
After a new battery although it didn't need one. And a new boot latch as we think that was the problem. Has been fine for a week. Now this morning started  going off agsin. It somehow unlocks it's self. Now it's not locking on my key fob again...help anyone had this

When you say new battery was that the car battery or the keyfob battery ? A dodgy car battery can affect the alarm as it can see a low system voltage as an attempt to tamper with alarm and activate. If you don't know when battery was replaced maybe time to get it checked, standing voltage an hour after charging or driving should be around 12.6 volts, if it is lower it is a danger sign ( and remember alarm systems are notorious for sucking power out of a battery at standby).

Also I learned to be cautious of cheap keyfob batteries, when my Civic fob started playing up on unlock  and locking I fitted a cheap battery, it did not cure the problem and was a nuisance until I fitted a proper Duracell battery ( 5 ) and no problem since ( 12 months ).

Culzean I agree with your comments,observations,however as Lianne has already mentioned the key fob works and then does not work on occasions this suggests a faulty fob or as you say a suspect battery in fob itself this would give the car the impression of tampering etc perhaps that would start the alarm sounding??
I am sure you are more knowledgeable on these things than I.
It would be very interesting if Lianne were to advise us all if and when this glitch is resolved, what actually caused this  problem.
Title: Re: Alarm going off ramdomally
Post by: culzean on January 10, 2019, 01:17:24 PM
The cheap fob battery had the same symptoms as the old battery it replaced ie it only worked when it wanted to, and I assumed that because I had put a new battery in ( albeit a cheap one ) it must be a faulty fob,  but putting a Duracell battery in the fob cured all the problems.  I suspect that the cheap battery had problems supplying the current needed when I pressed the button, even though I had checked the voltage and it seemed OK.
Title: Re: Alarm going off ramdomally
Post by: Jaffa Jazz on January 10, 2019, 01:20:16 PM
The cheap fob battery had the same symptoms as the old battery it replaced ie it only worked when it wanted to, and I assumed that because I had put a new battery in ( albeit a cheap one ) it must be a faulty fob,  but putting a Duracell battery in the fob cured all the problems.  I suspect that the cheap battery had problems supplying the current needed when I pressed the button, even though I had checked the voltage and it seemed OK.
Point taken quality always wins
Title: Re: Alarm going off ramdomally
Post by: sparky Paul on January 10, 2019, 01:22:08 PM
Seems like you have covered some of the obvious culprits.

Then on my dash board it's telling me my boot was open when it was not.

That tells me to start looking at the tailgate first. You have changed the latch, so check for water ingress into any of the tailgate wiring, and the condition of the wiring in and around the rubber gaiter between the car body and the top right hand side of the tailgate.

It's not a problem I've heard of on the jazz in particular, but on other cars I have had broken or chafed wires in the door wiring gaiters. This can cause exactly these types of problems, random unlocking without disabling alarms, non functioning remote locking, and can be intermittent. This problem usually manifests itself on the driver's door or tailgate, as these get the most use.
Title: Re: Alarm going off ramdomally
Post by: Lianne on January 10, 2019, 08:32:53 PM
Thank you for your awnsers. So my other half stripped the bsck of my boot and water has got into the electrics somehow and cordded. So that seems to the issue just hope it can get fixed
Title: Re: Alarm going off ramdomally
Post by: sparky Paul on January 11, 2019, 08:28:49 AM
So my other half stripped the bsck of my boot and water has got into the electrics somehow and cordded. So that seems to the issue just hope it can get fixed

At least you have found something, you should be able to get that sorted out without too much difficulty.