After 2 days of no use I get this alarm & battery flat.  Vehicle battery good. Charging system good. No extras fitted. Nothing plugged into sockets. Alarm bongs every 5secs. 
Any ideas?

Edited 24 April, 20224 yr by john999boy
Unplayable video removed.

Can't get your video to play, however at 12 years old it is highly likely that the battery in the alarm unit is defunct or nearly so. There will be a fault code stored on your car which may also show whether the alarm unit is an H09 or H12.

 

The alarm unit can be replaced using the instructions in the link below. You can just open up the failed alarm and replace the battery but there is a high possibility the the battery has leaked and damaged the printed circuit board.

 

Skoda want £274 for parts and labour to replace an H12 alarm unit. Recommendation is to change every 6 years.

Alternatively, you will find pre-owned units advertised on line at around £35 and up. but chances are they will not last as they have been on a shelf for a while with no charge from a main battery and most are more than 6 years old.

 

There used be a Chinese source but has dried up recently.

 

https://www.briskoda.net/forums/topic/500927-guide-to-repair-bosch-h12-alarm-siren/

 

Pikpilot thanks for the prompt response. Unfortunately I couldn't remove the video. Thanks for the link, very informative. I don't have VDCS or OBeleven but do have a generic plugin obd reader so I'll look for a code. Can the vehicle be used with the alarm unit unplugged? Juzt to confirm it's the culprit before buying a new unit. TIA

5 hours ago, Ash69 said:

Can the vehicle be used with the alarm unit unplugged? Just to confirm it's the culprit before buying a new unit.

Never tried unplugging it but I would expect to see many fault codes stored for "loss of communication with the Alarm unit"

I have disconnected & removed the alarm. Driven a few miles & tried starting a few times.

All seems to be working OK atm. I'll see what happens over the next week 🤞

Solved!! New car battery was a dud. New battery bought & all is now as it should be 😉