high battery drain again

[Tainui]

I'll share my experience in hopes that those interested may work with their dealers.

My E70 has been in the shop for a quite some time for two issues related to high battery drain.

The first problem required three separate visits for various error messages from high battery drain, ABS failure, stability failure, you name it. Basically it turned out to be corrosion (yes, corrosion in the first 15k miles) due to water leaking into the rear where the wire loom connects to the body. Apparently there was a puddle there with a connection bathing.

Recently the high battery drain message returned and the entire month of November it has been in the shop again. They diagnosed a footwell control module not going to sleep as it was supposed to. They reprogrammed the entire car, updated several BMW patches to software, and the problem persisted. Finally, they replaced the instument cluster this past week. Supposedly since then, everything has been fine and the car has been hibernating as it is supposed to.

I'm due to receive it back finally today.

The sad part for me is that I've owned it for 12 months and more than 2 months it has been at the dealership for repairs.