In this article, you will learn about the BMW intelligent battery sensor or also known as BMW IBS. BMW intelligent battery sensor is connected to the negative terminal of the battery.
We will discuss what IBS sensor does, common problems with BMW IBS sensor and how to troubleshoot IBS problems yourself.
What is BMW Intelligent Battery Sensor
BMW cars depend greatly on the battery not just for starting the engine but also for many other functions.
Battery plays a critical role in BMW cars. Intelligent Battery Sensor (IBS) is used to monitor various battery parameters such as voltage, current, and temperature.
The IBS sensor is mounted on top of battery negative terminal and has the ground cable and two connectors. One of the IBS cables connect gets power from the positive terminal. The second cable is connected to the DME and measures the battery load. This is known as the Bit Serial Data Interface or BSD.
Purpose of BMW IBS
BMW IBS sensor measures several battery parameters such as:
SoC (State of Charge)
SoH (State of Health
Symptoms of a bad IBS sensor
BMW battery will drain when parked
BMW will not go to "sleep", drains the battery
Dead car battery
IBS not able to wake up the DME
Voltage fault, DME not on. This can be caused due to a short to B+ line.
Voltage fault DME on, which can be caused to ground short
BMW IBS Sensor Recall
From time to time BMW may recall vehicles if they have been manufactured with safety defects. To find out if there is a IBS sensor recall on your BMW you need to call the dealer and provide them with the VIN number or check for recalls online.