Internal Calculation of CBS Service Item

Condition Based Service (CBS)

Principle of Operation

Internal Calculation of CBS Service Items

For certain wear and tear items, sensors are not needed by the Condition Based Service. The wear items that are calculated and managed internally by the instrument cluster are:
- Brake fluid
- Coolant
- Spark plugs
- Visual and functional checks (vehicle check)
- Official State Safety and/or Emissions Inspections

The maintenance of these items is performed at fixed intervals. The residual wear or the remaining time to next service is calculated by the instrument cluster using the travel/time parameters of: mileage, current dale and internal distance counter. When a service item is due, it is shown in the instrument cluster or the Control Display.

Note: The internal distance counter plays a particular role. Unlike the Time/Date, this counter cannot be set by the driver.

However, battery down times (battery cut off by the distribution switch) also stop the trip distance counter which leads to longer time based service intervals. This will disrupt the CBS volumes for engine oil, microfilter, brake fluid and coolant.

To correct this, the internal counter status must be reset by the DISplus/GT1. The wear dependent items internally calculated by the instrument cluster are stored in the instrument cluster and in the CAS control module (redundancy).

Note: The instrument cluster and the CAS must not be replaced simultaneously, otherwise all current oil maintenance schedule data will be lost.