BMW x5 battery disconect

[Sevenking]

Hi everyone

I have been driving a BMW X5 40e for two years. I really like the car, but my configuration does not have a heated steering wheel, I would like to retrofit it, but for this I need to connect additional wires. In all manuals, the negative battery terminal is disconnected for this.

Who has encountered this, is it possible to disconnect a 12V battery exactly at 40e and will there be no consequences?

Thanks

[corduroy]

My car came with the heated steering wheel, so I haven't encountered that. But I've disconnected the negative terminal off the main 12v several times to work on my 40e without any issues.

With that said, I don't know if you also need to disconnect the 12v off the auxiliary battery as well.

[Sevenking]

Thanks for the answer

There are two 12V batteries in the X5, did you disconnect two or just one larger one?

[RED_Y_]

I disconnected both just to be safe.