I've got a strange issue with the fabia, I was living with it for a while until things changed last night.

 

I only have one key and unfortunately the remote hasn't ever worked. I've tried various techniques to get the fob to pair and it never works. I have tested the fob and it emits RF when the buttons are pressed so I know it works too! 

 

For A while now I have just been unlocking and locking the car manually using the drivers door barrel, but yesterday when I unlocked it, the alarm went off and now my windows have been locked out too. 

 

I am having to leave the car unlocked as to not upset the neighbours every time I go for a drive, but ideally I'd like to get the fault fixed ASAP.

 

I've hunted the Web and spoke to various people and nothing works, I was wondering if anyone else had experience with this and could help me please? 

 If the remote has never worked it may not be the one for the car so I would expect that to be an issue requiring matching through VCDS or similar - for the time being do not try to do anything about that until you sort the door lock/key/alarm issue. If you can do it, I would suggest editing title to something like "Alarm activated when using key in door" as pairing the key is not the important issue, or edit this post to reflect issue with remote only, removing key/door/alarm issue and starting a seperate post. This may get you better/specific answers.

Edited 6 July, 20223 yr by KeithCheetham

So I've done some looking, it's the same key as a mk4 golf but has a 3 button remote? 

 

I did attempt to use VCDS to program the key but it didn't work and I got a failed to program code

 

Fortunately I have VCDS full edition so I can do most things from home. This one just has me stumped.

 

Yes the alarm stops when the key goes into ignition and the car starts fine 

 Just edited my post, noticed you had mentioned starting.  Assume you are trying to just programme the remote as key is already matched to the immobiliser if the car starts.

There's stuff about key pairing in this thread on clubpolo https://www.clubpolo.co.uk/topic/204921-guide-how-to-install-oem-remote-central-locking-in-a-polo-9n-with-original-parts/?do=findComment&comment=1812092  I think you'd need to get another (lock) key cut to be able to do it though.

 

It sounds a bit like the primary (recent) failure may be with the window motor module though. When you use the key to unlock drivers door, do the other doors unlock, or not?

Might also be worth acquiring another fob* to try. I helped a fella recently who'd been told by VW themselves that his RF fob was working correctly, only to find that when I sent him a spare I had, the problem he was having went away.

 

*just the electronics half, not the immo chip + physical key bit.

 

Oh, and also make sure the battery contacts are clean, to ensure it's operating at full power.

Edited 6 July, 20223 yr by Breezy_Pete

8 minutes ago, Breezy_Pete said:

There's stuff about key pairing in this 

It sounds a bit like the primary (recent) failure may be with the window motor module though. When you use the key to unlock drivers door, do the other doors unlock, or not?

No only drivers, but the windows work opening and closing when the key is turned and held, strange for both sets of switches to have failed at the exact same moment but the windows still work?

9 minutes ago, Breezy_Pete said:

There's stuff about key pairing in this 

It sounds a bit like the primary (recent) failure may be with the window motor module though. When you use the key to unlock drivers door, do the other doors unlock, or not?

No only drivers, but the windows work opening and closing when the key is turned and held, strange for both sets of switches to have failed at the exact same moment but the windows still work?

6 minutes ago, Xhuy10nx said:

but the windows work opening and closing when the key is turned and held

Have you tried this today, i.e. very recently?

The status of the key position microswitches in the lock go via the WM. 

As you're just down the road, maybe pop up one evening with door card off to try a known good WM and see if that helps the situation?

I tried it last night, that's how I've been opening amd closing the windows.

 

Might be worth a try none the less? 

I guess you could have a broken wire in the door bellows. So the key position info is getting to the WM, but not to the central convenience unit? It's a thin black/blue wire from pin 8 of the WM.

I'll have to check that because it could be a good point! 

 

I always thought the CL would only unlock all doors if used with the remote? I've never owned a Skoda before though, only VW, Seat and Audi 😅

@Breezy_PeteI can confirm pin 8 is working as the central convenience unit is acknowledging the central locking opening.

 

i took the lock barrel out and opened it with a screwdriver with the key still in ignition and the CL opens just fine all doors.

 

Looks like maybe the reciever is busted or something...?

 

Maybe im missing something on VCDS that i could use to assist... who knows unfortunately

I'll have to have a think about it, but I would think keyfob problem rather than receiver/central convenience unit problem, TBH.

You can get keyfobs pretty cheap on ebay.

 

4 minutes ago, Breezy_Pete said:

I'll have to have a think about it, but I would think keyfob problem rather than receiver/central convenience unit problem, TBH.

You can get keyfobs pretty cheap on ebay.

 

Thanks,

 

I have had the key checked and its pumping out a radio frequency but I guess it could be a corrupt one? 

 

I'll get one and see what happens I guess... I'll report back anything I find here

6 hours ago, KeithCheetham said:

 Just edited my post, noticed you had mentioned starting.  Assume you are trying to just programme the remote as key is already matched to the immobiliser if the car starts.

That's what I'm hoping, but no tricks seem to work. That is, unless I tried to program the only key I have in VCDS wrong...? 

1 hour ago, Xhuy10nx said:

@Breezy_PeteI can confirm pin 8 is working as the central convenience unit is acknowledging the central locking opening.

 

 

I'm not certain that this is a safe conclusion. There's a key turned signal that goes via WM and that wire, but there's also another microswitch or two in the lock module whose status is directly monitored by CCU with a wire that doesn't go via WM. The latter may be getting through OK, but the former not reliably.

 

I'd be having a look in the bellows if it were mine.

I will check when I next get an early finish... but when the key was in ignition and I took the barrel out I was able to activate the CL with a screwdriver both directions. As in it unlocked and locked 

Yeah that does suggest WM and wire path OK, at that time, but they (WMs) can show intermittent (mis)behaviour. 

Not sure what's going on at this point.

 What instructions are you following for matching the remote (not the primary issue here) - the following may assist. Note that at the bottom it suggests that old remotes may require deleting. I have only done remote matching on a Mk2 Fabia due to swapping the instrument cluster out, but did work using a Ross Tech instruction. 

Ross-Tech: VAG-COM: Remote Control Matching Info

I was trying this or very similar! I'll try again tomorrow and see how we get on 🤞🤞

So I tried again following the guide and all I was met with was the incorrect programming fault code in the CCM

 

I then replaced the battery and tried again, unfortunately no luck. 

 

I'll live with this until pay day and see what happens with a replacement new fob, hopefully I'll have more luck...

 

Failing that, does anyone know anything about the reciever unit? Is it built in the CCM or is it a separate unit? I'm beginning to wonder if I have a fault inside the CCM, but without proving it and exploring all other options I am very reluctant to purchase a part. I don't like throwing parts at things as it's poor workmanship 

Am I correct in saying it needs to be a 434mhz transponder?

Yep

15 minutes ago, Xhuy10nx said:

does anyone know anything about the reciever unit? Is it built in the CCM

Yes

Brilliant, I'll try the key first, then hunt down a replacement ccm, they don't seem too dear so worst case it might be a handy spare part.

 

Might also explain why my electric windows are showing as not installed, I've checked the cables today (admittedly without my glasses on 😂) and they all seem fine, but before a ccm is ordered I'll check again

 

I've had a small nagging doubt that the reciever unit may have been at fault but it's a tricky one to prove without replacing the key etc first obviously 

10 minutes ago, Xhuy10nx said:

Might also explain why my electric windows are showing as not installed

 

Nope. that would be because they aren't connected to any central databuses (CAN), only to each other with 1-wire LIN bus. Invisible to diagnostics.

 

The keyfob is much, much more vulnerable to damage than the CCM unit's receiver section.