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Active Service System (ASSYST PLUS), Function - GF00.20-P-0004RF

Model 205, 253 

Function requirements, general 

IMPORTANT The electronic ignition lock control unit (N73) transmits the status of circuit 15 via the user interface CAN (CAN HMI) to the instrument cluster (A1).

Active Service System PLUS (ASSYST PLUS), general 

ASSYST PLUS calculates when the vehicle is due for a service. This is done either after a precisely defined kilometer reading or after a certain time interval, depending on which limit is reached first. In addition, it allows the driver or the service personnel an overview of the expected service operations at the vehicle.

The calculation is performed in ASSYST PLUS, which is integrated into the instrument cluster as a software solution. ASSYST PLUS takes into account the time and distance-dependent additional operations in accordance with the vehicle equipment. The scope and the time of the due service are displayed in the multifunction display (A1p13) of the instrument cluster.

ASSYST PLUS comprises the following subfunctions:

Function sequence for determining the remaining distance 

The remaining distance is calculated from the difference between the defined kilometer reading and the distance already traveled. The distance traveled is defined via the wheel speed.

The Electronic Stability Program control unit (N30/4) transmits information about the wheel speed via chassis FlexRay (Flex E), electronic ignition lock control unit and user interface CAN to the instrument cluster. The remaining distance to the next service is determined by means of the comparison to the travel distance reading that was reset and stored at the last service. The remaining distance is the primary decisive factor for the service indicator if the remaining distance is reached before the remaining time.

Function sequence for determining the remaining time 

The remaining time is determined in the ASSYST PLUS. The remaining time to the next service is calculated by comparing the time of the service reading as reset and stored during the last service. The remaining time is the primary decisive factor for the service indicator if the remaining time is reached before the remaining distance.

Function sequence for evaluating data 

ASSYST PLUS evaluates the usage conditions of the vehicle and calculates the time and scope of the service work required. Engine-specific parameters such as e.g. the oil level and oil quality are also taken into account.

The CDI control unit (N3/9) (diesel engine) or the ME-SFI [ME] control unit (N3/10) (gasoline engine) evaluates all the engine-specific parameters and it sends corresponding information over the engine CAN (CAN C), powertrain control unit (N127), suspension FlexRay, electronic ignition lock control unit and the user interface CAN to the instrument cluster.

Function sequence for service indicator 

The following notes with service code can be shown in the multifunction display of the instrument cluster:

In the event that the service date was exceeded, the following messages are shown:

IMPORTANT The display of the service due date is shown rounded to 100 km or 100 miles or to the specific day. The two-digit service code provides information on the scope of the service operations to be carried out. The service scope is shown as a service code (e.g. "A1"). The letter denotes the service scope, and the following digit or letter provides the workshop with information about additional operations. This enables the workshop to already provide the customer with the most precise specifications possible on the time expenditure and expense of the due service when the appointment is made.

Function sequence for service interval reset 

Model 205 as of 01 06 2018, model 253 (except model 253 99) as of 01 06 2019 or model 253 99: 

The service interval can be reset via the instrument cluster finger navigation pad (S163/1s10) in the instrument cluster multifunction steering wheel button group (S163/1). The request is read in by the steering wheel electronics (N135) and transmitted via the steering wheel CAN (CAN LR) to the steering column tube module control unit (N80). The steering column tube module control unit sends this request via suspension FlexRay, the electronic ignition lock control unit and user interface CAN to the instrument cluster. The instrument cluster shows the "Next Service" message. "Maintenance interval reset" appears in the instrument cluster if the instrument cluster finger navigation pad is pressed for longer than t = 3 s. The service interval is reset.

Model 205 up to 31 05 2018 or model 253 (except model 253.99) up to 31.05.2019: 

Press the O K button (S110s6) in the left multifunction steering wheel button group (S110) to reset the service interval. The request is read in by the steering wheel electronics and sent over the steering LIN (LIN E1) to the steering column tube module control unit. The steering column tube module control unit sends this request via suspension FlexRay, the electronic ignition lock control unit and user interface CAN to the instrument cluster. The instrument cluster shows the "Next Service" message. The "Maintenance interval reset" message appears in the instrument cluster if the O.K. button is pressed for longer than t = 3 s. The service interval is reset.

Should an exchange of the instrument cluster become necessary, the current service data must be entered manually.

The following parameters are required for this:

  Overview of system components, instrument cluster (IC) component description   GF54.30-P-9996RF
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