So my auxiliary belt snapped on Saturday and the car sat for 2 days with a dead battery. I picked the car up this morning and its all working great. The vibration when I accelerated has gone too.

But now when I open the doors remotely, only the driver door unlocks and the passenger and rear doors don't. How do I change this.

Sounds like what I have on my Fabia - incorrectly-coded convenience unit.

Possible other symptoms:

Key too probably just opens the driver's door.

Passenger side can still lock driver's door - which increases the risk of locking-in the keys!

I'm no expert but as I recall the unit has to know which wires to send its signals down. There are different codes for 2/4 doors, left/right hand drive etc.. I'm guessing your code died when the battery was disconnected. Perhaps there should have been a backup battery to maintain it but that has run down?

My unit was replaced a couple of years back, when my (independent) servicer spent ages trying 'every code he could get from VAG-COM' without success. At the time I saw quite a lot of information and even some suggested codes on Briskoda. I've not (yet) managed to find it again.

So you may have to consult a main dealer (est. £75 if all goes well). That's what I'm doing on Thursday and I'll let you know if it works.

Mine was like this after a battery change last year. It went back, the garage took the earth off the battery for a few hours, put it back on and all was hunky dory. No problems since.

Gaz

Mine was like this after a battery change last year. It went back, the garage took the earth off the battery for a few hours, put it back on and all was hunky dory. No problems since.

Gaz

+1

You'd be surprised how many niggles that are CCM related, especially central locking, which can be cured by resetting the ecu/ccm. Disconnect battery for an hour or two and see what happens.

I said I'd report on whether my visit to the main dealer worked. In short - no. Whatever code my servicer found seems to have been about right. There was no suggestion that the unit was duff/damaged/incorrectly installed. They said something about the passenger-side control unit: I suspect something else has been lurking because:

1) The rear wiper sometimes operates on ignition,

2) The alarm was forever going off - until in sheer desperation I removed the siren fuse (F60 in a Mk1 Fabia: I might try putting it in again).

They'd estimated £75 but it was only £45. Still a lot for no improvement but (no doubt touting for servicing/sales business!) they threw in a general look-over and flagged up a broken spring which I can get repaired before the MOT.

I asked and the code should survive a battery disconnect. I'd wondered because I'd lost the one-touch window operation - now restored.

Do I need to take both connections off the battery or is just the black wire okay? Lol! Can I leave it overnight disconnected?

Do I need to take both connections off the battery or is just the black wire okay? Lol! Can I leave it overnight disconnected?

Just the black one (earth) will be fine.

Gaz

Just the black one (earth) will be fine.

Gaz

Thanks. Left it off for an hour today and it worked! Happy days