Hello,

I found a very helpful post in one of the Octavia fora about alarm siren battery replacement and I have the same problem with my 2015 Rapid. I've ordered a new batt. for it but I'm struggling to remove the siren unit. I've found it under the scuttle cover but it's in a metal bracket and feeling round the back of it, it seems there's a nut. I can't see a way to get a spanner onto it though. Does anyone have the knowledge of how to remove the alarm siren module from a Rapid? I'm guessing it's the same as the Fabia Mk3?

Any help gratefully received.

Cheers, Mike...

I don't know but I suspect removal of the wheel arch liner will be needed.

Sadly not, that'd be easier! The previous generation had it behind the liner but these ones have it under the scuttle cover.

I should have taken a photo of the bracket etc. but I didn't think of it and it's back together again now with wipers reattached.

Going by a parts listing on the internet, there is a metal "bracket" which looks more like a metal box, it used to be secured to the car's body using 2 bolts but from 2015, these 2 bolts were replaced by 2 pop rivets - probably for security purposes.

There is also a self locking lock on probably the top of this box, so maybe that nut secures the siren assembly to this box.

Hopefully that helps a bit to letting you work out how to separate and/or remove the siren assembly, though it does sound like you'd need to drill out the 2 pop rivets and remove the complete siren and bracket/box.

Sorry, it looks like that was wrong there, there never were bolts securing these brackets/boxes/enclosures, always pop rivets, on the later versions the diagram shows a captive threaded stud sticking out of the top of the siren assembly, that is what the self locking nut is used to secure to the bracket/box/enclosure.

Edit:- so maybe there is just enough space to get the siren assembly out after you remove the self locking nut that is on the top of the bracket/box/enclosure.

Edited 13 November, 202513 Nov by rum4mo

This was a mission! I'm going to add a guide with photos of how I did it below to help any other Rapid owners (and possibly Fabia Mk3 if it's the same?) who have this battery problem. Before that I'm going to say that it's a different battery to the one shown in the Octavia thread here. That one is a 5 cell, 6V 200 mAh battery. The one in my Rapid is a 2 x 3 cell 3.6V 140 mAh battery pair.

Part No. for my alarm siren is either: 1K0 951 605C or F005V00327. Not sure which is the part No, I'll attach a pic of that as well incase it helps anyone.

When I was searching for info on the Rapid alarm siren module I found a document that listed two, so I assume they used both on this generation of Rapid. My advice would be to remove your siren module and open it up before buying a battery, unlike me who now has the wrong batt. sitting on my desk.

It's located under the scuttle cover, I've circled the bracket it's in, in the first pic. Pop the caps off the wiper hubs and remove the nuts. IIRC they're 13mm. Remove the wiper arms and then the rubber strip that runs along the bottom of the plastic cover. Remove the plastic scuttle cover. This is where the easy stuff ended.

The 2nd pic shows the silver bracket and it's rivited onto the car body. I couldn't see any other way of getting the siren out without cutting the tops off the rivets. You can't drill them as there's no access.

3rd pic shows the side view, the siren is the black plastic part (circled) sticking out from the silver bracket. The wire and plug above are connected to the siren.

A standard hacksaw blade was too deep to fit so I put a junior hacksaw blade into the handle (4th pic) until I'd cut enough to get the full sized blade in. This is incorrect use of the tool so you do this at your own risk.

Once cut I used a thin, long, flat bladed screwdriver to prise the brackets apart. It did bend the metal on the body but I can't really see a way of avoiding that. This gets the silver bracket into a state where you can put your hand in from the side and maneuver it such that you can slide a spanner in to undo the bolt holding the siren to the bracket. 5th pic.

Once that bolt is off you can fangle the siren into a position where you can get a screwdriver in to release the electrical plug and then get the siren out the side. You can also remove the silver bracket this way if you need to, once the siren is out. It's a faff but you can get it out. I found the best position was with the silver bracket rotated so the siren can be pulled out, 6th pic.

I said I couldn't see a way without cutting the rivits, that's not entirely true. There's a black painted piece of metal infront of all of this. Initially I thought it was spot welded to the frame but I don't think it actually is, there are square nuts on the back which could possibly be removed. However, I wasn't up for removing this as there is all sorts bolted to it.

Anyone following this guide does so entirely at their own risk. I'm just trying to help others. This took me about an hour to get the siren out but should take less time not having to figure out how to do it.

Once the batt. is replaced I'm going to seal the siren module with silicon bath sealant. It's probably not the correct thing to use but it's what I've got. Will replace the rivits with nuts and bolts. Even if I wanted to rivit it there's no access to get my pop rivit gun in.

I hope this helps others with theirs.

23 minutes ago, Screamager said:

1K0 951 605C or F005V00327

First of those is the VAG part number, other is Bosch part number.

Edited 15 November, 202515 Nov by Breezy_Pete

Aaaah, thank you. I didn't know that.