Active Service System (ASSYST PLUS), Function - GF00.20-P-0004FR
Model 257, 290
up to model year 2021
Function requirements, general
- Terminal 15 ON
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 is integrated as a software solution in the instrument cluster and determines corresponding service dates depending on the usage conditions of the vehicle.
Either the remaining time or the remaining distance until the service due date is displayed in the instrument cluster.
The driver or service personnel are also provided with an overview of what service work needs to be carried out on the vehicle (service scope). ASSYST PLUS takes into account the time and distance-dependent additional operations in accordance with the vehicle equipment.
ASSYST PLUS comprises the following subfunctions:
- Function sequence for determining the remaining distance
- Function sequence for determining the remaining time
- Function sequence for evaluating data
- Function sequence for service indicator
- Function sequence for service interval reset
Function sequence for determining the remaining distance
The remaining distance is calculated from the difference of the data stored regarding the maintenance interval and the travel distance covered since the last service. The travel distance is calculated based on the wheel speeds. The remaining distance is the primary decisive factor for the service indicator if it will be reached before the remaining time.
The Electronic Stability Program control unit (N30/4) transmits the information about the wheel speeds via the suspension FlexRay (Flex E), the electronic ignition lock control unit and the user interface CAN to the instrument cluster.
The service interval based on the remaining distance is permanently stored ASSYST PLUS and it is, e.g. for the European countries currently, 25, 000 km for "Service A" or 50, 000 km for "Service B".
Function sequence for determining the remaining time
The remaining time is calculated from the difference of the data stored regarding the maintenance interval and the time that has lapsed since the last service. The remaining time is the primary decisive factor for the service indicator if the remaining time will be reached before the remaining distance.
The service interval based on the remaining time is permanently stored in the ASSYST PLUS and it is 12 months for "Service A" and 24 months for "Service B".
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. oil level and 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 can be displayed with service codes on the instrument cluster:
- Service XX in XX days
- Service XX in XXXX km/miles
- Carry out service XX
If the service date has been exceeded, the following messages are shown:
- Service XX has been due for XX days
- Service XX has been due for XXXX km/miles
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 allows the workshop to provide the customer with the most accurate details regarding time and expense involved for the due service in advance when the appointment is made.
Function sequence for service interval reset
The service interval can be reset in the workshop menu. Here, ASSYST PLUS/full service must be selected under the entry "Confirm service". After selecting the engine oil quality used, the service can be confirmed. The menus are operated using 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 more 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:
- Current kilometer reading/mileage reading
- Current date
- Kilometer reading/mileage reading when last oil change took place (from service booklet)
- Date of the last oil change (from service booklet)
- Calculation data of ASSYST PLUS
| Overview of system components, instrument cluster (IC) component description | GF54.30-P-9996FR |