BMW Negative Battery Cable With IBS - Hella 12427603567

Replacement negative battery cable, please see vehicle specific fitment notes

This negative battery ground also includes the IBS (Intelligent Battery Sensor) which is a common failure item on aging vehicles. If your vehicle has fault codes for the IBS you must repace this cable before your vehicle fails to start.

The intelligent battery sensor (IBS) is a mechatronic component with its own microcontroller for monitoring the battery condition. The IBS is secured and connected to the negative terminal of the battery. The supply voltage for the IBS is fed across a separate cable. For data transfer, the IBS is connected to the DME (Digital Engine Electronics) or DDE (Digital Diesel Electronics) via the BSD (bit-serial data interface).

When installing this IBS it's important to make sure you order the adapter leads as noted in the fitment guide if you don't already have them. Additionally, over-torquing the locking nut for the battery terminal nut could cause failure of the t-bolt. Per BMW TIS recommendation we recommend the nut be torqued to 5Nm (~4 ft lbs).