BCM has deleted its programming

[kaykayy1402]

Hi all, new here!
I have a 69 plate Leon which I've had from new. Just before Christmas my central locking started playing up and then one day, I had about 7/8 fault codes come up at the same time. Headlights, check brake pads, indicators, stop/start etc all stopped working. Took it to mechanic who sent it to electrician and turns out my BCM has just decided to delete all of its programming! Physically it looks fine but just programming has gone. Called seat and they said they haven't supplied a BCM for 2 years so it's not a common fault.

Has anyone else experienced this? Any ideas?

 

[East Yorkshire Retrofits]

This isn't something we've seen before. We've seen them get upset and trigger component protection which in turn cannot be removed due to a checksum error, but that's about as weird as it usually gets

We'd be happy to reconfigure the BCM (or attempt to) or supply and adapt a replacement

 

[ViperSlider]

I've seen, with my own eyes, a wild variety of issues and amongst them is a module randomly zeroing out it's coding, change coding, same as above with the -1 Checksum error (what a pain in the ass that is), decide it want's to die with no external input and everything inbetween.

With that being said, it's super rare and normally it's the result of an external factor like a coding dongle script gone wrong, someone changed coding and then caused mayhem, someone trying to add an aftermarket key or retrofit but really badly etc. I'd get a 2nd opinion on the "deleted all of it's programming" just so you know for sure whether it's worth trying to recover the BCM or slam in a new one.

Seat saying they haven't sold a BCM for 2 years... No comment on that LOL

Providing the BCM is undamaged then it can likely be recovered using ODIS, if it turns out you need a new/replacement BCM then ODIS would be needed for that too

 

[cairus]

Memory broken. Change the bcm

Unit 09, BCM have CP

 

[kaykayy1402]

This isn't something we've seen before. We've seen them get upset and trigger component protection which in turn cannot be removed due to a checksum error, but that's about as weird as it usually gets

We'd be happy to reconfigure the BCM (or attempt to) or supply and adapt a replacement

Thank you for your comment . And how much do you charge?

 

[kaykayy1402]

I've seen, with my own eyes, a wild variety of issues and amongst them is a module randomly zeroing out it's coding, change coding, same as above with the -1 Checksum error (what a pain in the ass that is), decide it want's to die with no external input and everything inbetween.

With that being said, it's super rare and normally it's the result of an external factor like a coding dongle script gone wrong, someone changed coding and then caused mayhem, someone trying to add an aftermarket key or retrofit but really badly etc. I'd get a 2nd opinion on the "deleted all of it's programming" just so you know for sure whether it's worth trying to recover the BCM or slam in a new one.

Seat saying they haven't sold a BCM for 2 years... No comment on that LOL

Providing the BCM is undamaged then it can likely be recovered using ODIS, if it turns out you need a new/replacement BCM then ODIS would be needed for that too

I've had absolutely zero work done to my car other than services and MOT's which obviously don't affect the electrics so I think I've just been insanely unlucky with it deciding to basically unalive itself!

I've got another electrician lined up to look at it next week and try to put the coding back on hopefully, failing that, I've booked it in with seat for the following week. Trying to avoid going to seat as much as possible as £180 just to do diagnostics is ludicrous.

 

[kaykayy1402]

Memory broken. Change the bcm

Unit 09, BCM have CP

Does this happen often? Or something you've heard of before?

 

[ViperSlider]

I've had absolutely zero work done to my car other than services and MOT's which obviously don't affect the electrics so I think I've just been insanely unlucky with it deciding to basically unalive itself!

I've got another electrician lined up to look at it next week and try to put the coding back on hopefully, failing that, I've booked it in with seat for the following week. Trying to avoid going to seat as much as possible as £180 just to do diagnostics is ludicrous.

It does sounds like you're just sht outta luck lol. Once the 2nd opinion has been sought, it may be more economical to fit a used BCM. A new one from Seat including their fitting will be well over £500 as the BCM itself usually retails for between £300-£500 without fitting and Seat won't fit/program a used BCM.

You don't mention your location, do you have any independent VW Group specialists in y our area?

 

[cairus]

He needs someone to remove the component protection for him. ATTENTION: IF THE BCM IS FROM ANOTHER VEHICLE, THERE IS ALSO A DIFFERENT DATA SET ON IT!!!!!!!!!

 

[cairus]

Seat dealers are allowed to install used parts, if this is not done, it is the dealer who does not want it, but not Seat. Nur unit 15, Airbag is Not allowed

 

[ViperSlider]

He needs someone to remove the component protection for him. ATTENTION: IF THE BCM IS FROM ANOTHER VEHICLE, THERE IS ALSO A DIFFERENT DATA SET ON IT!!!!!!!!!

No need to shout lol. Both Seat and a good independent VW Group specialist will use ODIS which would both match component protection and correctly code and parametrise the BCM for the vehicle.

 

[ViperSlider]

Seat dealers are allowed to install used parts, if this is not done, it is the dealer who does not want it, but not Seat. Nur unit 15, Airbag is Not allowed

Seat dealers in the UK will refuse to deal with used control modules due to security risks and guidance from Seat UK.

and because they want to earn the money from a new control module.

 

[cairus]

No need to shout lol. Both Seat and a good independent VW Group specialist will use ODIS which would both match component protection and correctly code and parametrise the BCM for the vehicle.

conditional... if Odis says it doesn't fit the data collection, Odis doesn't play any parameters

 

[ViperSlider]

conditional... if Odis says it doesn't fit the data collection, Odis doesn't play any parameters

As long as the HW part number is correct and the module isn't faulty, ODIS will work. I've done hundreds of BCMs, large portion for MQB and never had a problem with the correct part number.

 

[East Yorkshire Retrofits]

Thank you for your comment . And how much do you charge?

Please send us a message with your reg and vin

 

[cairus]

Solange die HW-Teilenummer korrekt ist und das Modul nicht defekt ist, funktioniert ODIS. Ich habe Hunderte von BCMs gemacht, einen großen Teil für MQB, und hatte nie ein Problem mit der richtigen Teilenummer.

If it is exactly the same, if it comes from a different vehicle, it can happen that Odis rejects it. I speak from experience. That's why I only do CP at the dealer and do the rest myself.