Hi

I've got a faint beep or chirp after locking/double locking the car. Sometimes it's there, sometimes it's not, only ever started happening this week.

I'm in Europe so we don't have the usual locking chirp enabled like in the US.

What might that be? Infamous aux alarm sounder battery on its way out?

Here's a vid, volume has to be cranked up but definitely audible.

 

Is that on one or two presses of the remote?
It sounds like it MAY be a physical 'click' or something also and not necessarily an electronic chirp.
Have you disabled the mirror fold and tried again?

 

This is 2 presses, not on the remote but on door button.

Will try with one press, with remote and with mirror fold disabled and report back

 

While waiting for that info, so far it would seem that your 'sounder' has about failed. It's a fairly common problem and not super problematic nor expensive to replace. There are threads in here about doing exactly that.

 

The results of testing are:
- as expected, no difference between using key vs door button
- 1 press - consistently no sound
- 2 press w/ mirror fold disabled - no sound 100% of the tries
- 2 press w/ mirror fold enabled - sometimes sound

Logic would direct me towards indeed the sound being caused by the mirrors folding and some plastic acting similar to a guitar string. Good ear @Cee Jay !

Especially that the sound is more likely to occur after locking after a drive - if I try to reproduce the sound without starting the car, most of the time it doesn't occur.

I was mentally ready for the secondary alarm sounder disassembly and disconnection but I absorbed all the other threads and at no point do I have the symptom of "geiger counter" sound.

Assume it's safe to write it off as part of the car's soul and live with it?

 

I'd probably prefer no sound as it doesn't affect the locking in the US. I don't know if Poland has the actual Double-Lock where even the inside mechanisms are disabled, but I'd find that problematic at best.
I use the sounder to verify that the lock happened, but with folding mirrors it's pretty obvious anyway.

One thing though, what happens if someone opens your car without the key? That sounder I do believe is also the alarm sound.

 

Alarm on mine sounds the horns.

 

I would say the sounder is dead or almost dead - I had no chirp noise on my car but after installing a sounder from a new Jag XF or such now it makes a chirp each time after locking it - when fitting the sounder I found out the old one was disconnected -- battery drain

 

After fitting the sounder on mine I sat into the car and waited for the intrusion sensors to kick off and the alarm sounded - just checking it worked - also if you jack the car up the alarm and horn sounds

 

 

@Cee Jay
the sounder in question is the auxiliary/backup one. I understand it will be a fallback if someone breaks into the car while battery is flat. It's why it has the battery who's age is the source of all related problems.

@ericmcn
Thanks for the vid. Your chirp seems to be something else - it occurs much earlier, in the middle of the mirror fold sequence, immediately after the lock sound.
My "new" sound is only heard ~300-500ms after mirrors are done folding. Also never happens if I double lock without the mirror fold (after disabling in settings).

All the threads outline how to get to the sounder with intention of disassemblying it - do you maybe know if it can just be disconnected (or at least checked whether it is or is not connected) without having to disassemble the pedestrian airbag bracket?

 

There's a lengthy discussion here about taking off the sounder, the chirp on mine is from the sounder - the user manual describes what will happen at various stages of locking the car and the alarm sounding - you can also leave a door open and lock the vehicle if the sounder is working it will make two rapid beeps, my old Subaru did the same thing if you left anything open whilst trying to lock it.

 

https://www.jaguarforum.com/threads/...t#post-1671336

 

@ericmcn
No sounds at all for me when leaving a door open and locking. But then again nothing like that ever happened for me, definitely tried to lock the door while not closing them properly before.

Thanks for the link, will have a try at disassembling this when I find some time.