Active service system (ASSYST PLUS), function - GF00.20-P-0004RF
Model 205, 253
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 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 the ASSYST PLUS, which is integrated into the instrument cluster as a software solution. The 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
- 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 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.
The service interval based on the remaining distance is permanently stored in the ASSYST PLUS and is currently 25, 000 km for "Service A" and 50, 000 km for "Service B" for European countries.
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.
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 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), chassis 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:
- Service XX in XX days
- Service XX in XXXX km/miles
- Carry out service XX
In the event that the service date was 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 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
Pressing the OK button. (S110s6) in the left multifunction steering wheel button group (S110) resets the service.
The steering wheel electronics (N135) read in the status of the OK button directly and transmit it to the steering LIN (LIN E1) to the steering column tube module control unit (N80). The steering column tube module control unit transmits the status of the OK button via the chassis FlexRay, the electronic ignition lock control unit and the user interface CAN to the instrument cluster. The message "Next service" appears in the multifunction display of the instrument cluster. The message "Reset the maintenance interval" appears 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:
- 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 the ASSYST PLUS
| Overview of system components, instrument cluster (IC) component description | GF54.30-P-9996RF |