Hi all. 
 

i had a new 12v battery fitted about a week ago, and as soon as it was disconnected, the alarm went off, and no amount of button pressing would stop it. 
 

it wouldn’t stop until the new battery was in place, and then I could press the unlock button and stop it. 
 

is there anyway that it can be stopped or turned off so if it ever happens again I don’t have the same thing  happen ?

 

i know the button inside turns off some features, but that’s just the motion sensor and the towing sensors. 
 

as far as I know it does t actually turn the whole thing off ?

 

jason. 

I'd expect that to be the default condition - but only if the car had been locked with the bonnet open prior to this - and the bonnet switch had failed in the closed position.

 

When we moved into our current house, it had an alarm system fitted, but the first time a winter storm knocked out the mains supply, the alarm, or at least the external bell box, kept alarming - that was because the alarm system's own battery had failed, replacing that sorted out that issue.

 

The only thing I know is, I replaced the car battery in my old 2000 VW Passat 4Motion that had a working alarm, and I did not have any issues with the car alarm going off.

 

Maybe buy a "memory saver" that plugs into the car's OBD2 socket and use that with a small support battery to stop that happening the next time, I have one of them and a battery pack for some reason.

 

Your thinking wrt the button on the inside of the car is correct.

The car was not locked and the bonnet was obviously up when we disconnected the battery for replacement. 
 

wouldn’t have expected it to go off with an unlocked car. But it did. 
 

luckily we had the new battery there so it was only around 30 seconds or so of that alarm going off. 
 

Jason. 

A question. How did you unlock the car, to change the battery. Did it unlock OK from the key fob, or did you have to unlock it manually (key in the lock)?

Just used the fob. The original battery wasn’t totally dead. It just wasn’t holding charge for more than a few nights. 
 

 

16 hours ago, lowedb said:

A question. How did you unlock the car, to change the battery. Did it unlock OK from the key fob, or did you have to unlock it manually (key in the lock)?

 

I'm guessing that you have a situation where a locked car has a dead battery, or you are just trying to find out how to approach this situation?

 

If you are, then the blade of the car key should be able to unlock the driver's door - and any other door that has a physical door lock, although normally it is only the driver's side door that now has a mechanical lock barrel.

 

From reading of other's experience on this forum, after that with cars that have the battery under the bonnet and the bonnet release on the passenger's side - but it is blocked deliberately when the passenger's side door is closed, you need to force the handle out slightly to "encourage" it to pass over the  door bin area and so open the bonnet.  On cars that leave the 12V DC socket live at all times, yo could use that point to trickle charge the battery - and then fully unlock as normal if the battery can be charged up.

 

Edit:- Audi and VW are less troublesome in this failed battery situation as the bonnet handle is on the driver's side but the 12V DC socket is not always live. SEAT seem to be the more awkward as the bonnet release is on the passenger side and the 12V DC socket is not always live.

Edited 13 August, 20205 yr by rum4mo

The situation was that the battery was very weak from being flat too many times (long story) 

 

but at the battery world dealer I went to have it replaced, as soon as we disconnected the battery the alarm went off. 
 

Just wondered  if there was a way to avoid it next time (if there is a next time). Seems there isn’t. 
 

jason. 

7 hours ago, Jason_M said:

Just wondered  if there was a way to avoid it next time (if there is a next time). Seems there isn’t. 

See below/as above.

 

On 11/08/2020 at 10:43, rum4mo said:

Maybe buy a "memory saver" that plugs into the car's OBD2 socket and use that with a small support battery to stop that happening the next time, I have one of them and a battery pack for some reason.

 

 

Thanks, AG Falco

I asked about the situation, because I know that unlocking the car with the keyblade in the lock doen't turn off the alarm (fully). That could have explained the issue.

12 hours ago, lowedb said:

I asked about the situation, because I know that unlocking the car with the keyblade in the lock doen't turn off the alarm (fully). That could have explained the issue.

 

Ah,  I see, I thought that you were "coming" to this from the angle that you considered that you might soon have a similar issue, ie your car was suffering from a dying battery, that was why I answered the way I did.

On 11/08/2020 at 08:45, Jason_M said:

is there anyway that it can be stopped or turned off so if it ever happens again I don’t have the same thing  happen ?

 

You can also put the key in the ignition switch and turn until the ignition lights come on. 

This stops the alarm sounding. You don't have to start the engine.

 

Thanks, AG Falco

Edited 15 August, 20205 yr by AGFalco
don't for done

Try pressing the unlock button on the fob right before you disconnect it.