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

Model 217, 222 

Function requirements, general 

• Terminal 15 ON

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

Active Service System PLUS (ASSYST PLUS), general 

Based on the vehicle's usage conditions, ASSYST PLUS determines the corresponding service due dates. 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. Either the remaining time or the remaining distance until the service due date is displayed in 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 stored maintenance interval data 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.

Function sequence for determining the remaining time 

The remaining time is calculated from the difference between the stored maintenance interval data and the time that has elapsed 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.

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, 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

In the event that the service due date is 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 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 

As of 01.06.2017 (model 222) or 01.12.2017 (model 217):

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 more than t = 3 s. The service interval is reset.

Up to 31.05.2017 (model 222) or 30.11.2017 (model 217):

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 "Reset the maintenance interval" message appears in the instrument cluster if the O K button 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	Model 217, 222 up to model year 2018	GF54.30-P-9996LF
		Model 217, 222 as of model year 2018	GF54.30-P-9996LFM