Brief description of components

The Condition Based Service is a system function distributed over several control units in the vehicle.

• Instrument cluster 

  The instrument cluster is the central unit. The CBS data for the full scope of maintenance work is stored in the instrument cluster. The information from the connected control units and information to be managed internally flow together into the instrument cluster (evaluation by traffic-light colours).

  In the instrument cluster the service requirement indicator appears for approximately 6 seconds at terminal 15 ON.

  The service requirement indicator shows the overall status of the vehicle in connection with the CBS.

  Detailed information on the full scope of maintenance work can also be requested manually. The display can be called up in either the instrument cluster or the Central Information Display (with M-ASK or CCC).

  The following target dates can be input in the instrument cluster:

  • Statutory vehicle inspection
  • Statutory emissions test

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  A maintenance operation can be reset using the reset button for the trip distance recorder.

  The instrument cluster initialises an automatic ServiceCall when a maintenance operation is due (TeleService 1 at BMW Assist telematics service centre).

• Central Information Display 

  On vehicles with multi-audio system controller (M-ASK) or Car Communication Computer (CCC): With this equipment, a folding Central Information Display (CID) is built into the dashboard.

  In the "Service" menu (in the 5th menu, "Settings"), detailed information on the scope of maintenance work of the CBS can be called up.

  In addition the following target dates can be input in the same menu:

  • Statutory vehicle inspection
  • Statutory emissions test

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  A manual ServiceCall can also be triggered at the CID.

• Remote control or identification signal 

  The CBS data is stored in both the remote control and the identification signal unit.

  The CBS data can be read out with the KeyReader in the Service Centre.

  The CBS data is displayed by the Service Acceptance Module (SAM).

  An identification signal unit is used for vehicles with Comfort Access.

For the Condition Based Service (CBS), information is exchanged with the following control units:

• CAS: Car Access System 

  From the CAS control unit, under certain conditions, the CBS data in the remote control or in the identification signal unit is updated.

  The CBS data is stored in the instrument cluster and, once redundant, in the CAS control unit. If the CAS control unit and the instrument cluster are replaced at the same time, the CBS data administered by the instrument cluster will then be lost. The data is delivered to the K-CAN.

• DME or DDE: digital engine electronics or digital diesel electronics 

  Maintenance requirements for the engine oil is calculated in the DME control unit or DDE control unit (maintenance requirements = remaining distance and latest date for the engine oil change). The most important input value here is the fuel consumption.

  The instrument cluster contains the data as follows:

  DME control unit or DDE control unit -> PT-CAN -> Junction box electronics (gateway) -> K-CAN -> Instrument cluster

  On diesel engines, the DDE control unit calculates the maintenance requirements for the diesel particulate filter.

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• IHKA/IHKR/IHR: Integrated automatic heating/air-conditioning system, integrated heating/air-conditioning system, integrated heating system 

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  The maintenance requirements for the microfilter are calculated in this control unit (maintenance requirements = remaining distance and latest date for the microfilter change).

  The scope of maintenance work is calculated by the control unit from various values.

  The instrument cluster contains the data as follows:

  IHKA control unit, IHKR control unit or IHR control unit -> K-CAN -> Instrument cluster

• DSC: Dynamic Stability Control 

  The remaining distance for the front and back brake pads are calculated separately in the DSC control unit. When making the calculation, the condition of the brake pad wear sensors is taken into account (reference point at 6 mm and 4 mm).

  The instrument cluster contains the data as follows:

  DME control unit -> PT-CAN -> Junction box electronics (gateway) -> K-CAN -> Instrument cluster

  IMPORTANT: Replace brake pad wear sensors before resetting.
• JBE: Junction box electronics 

  The junction box electronics is the gateway between the PT-CAN and the K-CAN. Moreover, the diagnosis cable is connected to the junction box electronics.

• CA: Comfort Access 

  For vehicles with Comfort Access:

  Under certain conditions the CBS data is saved on the identification signal unit. For this to happen, the identification signal unit should not be in the insert compartment. The CA control unit transfers the data via the interior aerial (radio).

• TCU or ULF: Telematics control unit or universal charger and hands-free system 

  The control unit for the telephone is needed for an automatic or manual ServiceCall (TeleService 2 at BMW Assist telematics service centre).

  The ServiceCall triggers the instrument cluster.

  The TCU or the ULF (universal charger/hands-free system) receives the data as follows:

  Instrument cluster -> K-CAN -> CCC or M-ASK (gateway) -> MOST -> TCU or ULF