Purpose of the System

Condition Based Service

E90, E91, E92 (3 Series)
E60, E61 (5 Series)
E63, E64 (6 Series)
E65, E66 (7 Series)

This information is intended to provide a general system overview of Condition Based Service (CBS) which is an advanced development of the previous Service Interval Indicator systems.

CBS measures, monitors and determines the required maintenance of several service items independently of each other. This technology prompts the customer to bring the vehicle in for service whenever one of the CBS items requires maintenance or replacement. CBS strikes a compromise between too frequent maintenance intervals and too rigid service intervals that call for the replacement of service items that may still have substantial remaining useful life. CBS also details the recommended, due, and overdue required maintenance during and after the BMW Vehicle Maintenance Program Agreement.


SERVICE RECOGNITION
The vehicle recognizes when a service is required using the following three methods:

A. Adaptive using sensor technology and algorithms to determine the required maintenance of a service item depending upon individual customer driving style. For example:

Oil change is determined from engine oil condition sensor which monitors the oil condition, oil level, and oil temperature, and from additional algorithms using these parameters: engine load, fuel consumption, time and distance since last oil change.

Air conditioning microfilter replacement is determined from algorithms using these virtual sensors: rain sensor, ambient air temperature, fan speed, air circulation, driving speed, heating use, time and distance since last oil change.

Replacements of front and rear brake pads are determined from 2-stage brake lining wear sensors located on left front and right rear brake pads, and from residual wear algorithms using these input parameters: travel distance, wheel speed, braking pressure, braking time, and braking frequency.

B. Fixed Time (months) to determine the required maintenance of a service item. For example:
Brake Fluid and Engine Coolant changes.
State Safety and Emissions Inspections.

C. Fixed Distance (miles) to determine the required maintenance of a service item. For example:
Vehicle Check.
Spark Plugs replacement.