Will A Battery Change Kill My Footwell Module?

[*-jester-*]

Hi all,
I've bought a 2010 E89 to replace my old E85 (which I regretted selling)

Anyway, whilst looking on Bimmercode (to code out bulb monitoring) I discovered that my E89 has a problem with its FRM, which after googling and searching on here, I've discovered that is apparently, quiet common.



It appears to be working fine (at the moment!) ...so was going to leave it well alone.

However, when you read the BimmerCode's FAQ's it mentions; "if the control unit has to be restarted after the battery has been replaced .... the control unit will not be able to start again"

And typically, my battery is no longer holding a good charge (previous owner didn't register it, but that's another story for another day)




So, my question to all you experts is: What are the chances of me killing my FRM when I disconnect the car battery to fit the new one?

 

[B21]

If your FRM is dying already then its going to fully die come what may..simply starting the car from a deep sleep state is analogous to a battery disconnect as as the FRM is concerned..best to just bite the bullet and manage the case proactively..

 

[TriggerFish]

While I defer to B21's knowledge on the deep sleep state - don't forget you could use a charger/jump leads to the points under the bonnet to maintain a constant power feed to the FRM while replacing the battery in the boot...

 

[B21]

While I defer to B21's knowledge on the deep sleep state - don't forget you could use a charger/jump leads to the points under the bonnet to maintain a constant power feed to the FRM while replacing the battery in the boot...

That is true..the prospect of the positive lead (live) floating around in the battery bay fills me with joy!

WCPGW...

 

[*-jester-*]

If your FRM is dying already then its going to fully die come what may..simply starting the car from a deep sleep state is analogous to a battery disconnect as as the FRM is concerned..best to just bite the bullet and manage the case proactively..

The voice of reason has spoken, you are right, and I totally get that.

I'm just worried about the bill
What would you suggest I do?
Do I remove the FRM myself and post it off to one of those ads on ebay who say they can fix them, like such >Clicky<
...or am I best taking the car to a stealer??
Or is there an easy fix? ...I think I know the answer to that, I'm just clutching at straws here

While I defer to B21's knowledge on the deep sleep state - don't forget you could use a charger/jump leads to the points under the bonnet to maintain a constant power feed to the FRM while replacing the battery in the boot...

I did consider something like that, I could hook up my jumper pack, but as B21 says, that comes with its own risks.

 

[Pondy]

I did consider something like that, I could hook up my jumper pack, but as B21 says, that comes with its own risks.

I seriously wouldn't do that. Not only could you potentially injure yourself badly, but you could fry other modules and electronics with the 'spike'/ arc when connecting a battery.

 

[B21]

The voice of reason has spoken, you are right, and I totally get that.

I'm just worried about the bill
What would you suggest I do?
Do I remove the FRM myself and post it off to one of those ads on ebay who say they can fix them, like such >Clicky<
...or am I best taking the car to a stealer??
Or is there an easy fix? ...I think I know the answer to that, I'm just clutching at straws here


I did consider something like that, I could hook up my jumper pack, but as B21 says, that comes with its own risks.

It’s a cheap and simple fix for someone with the right tools..in the UK £50 should see it…only snag is it’s a bench job so out it goes by post and back a few days later..I covered it earlier this year..