Active Service System (Assyst Plus), Function - GF00.20-P-0004GN

Model 166

as of model year 2016

Model 292

Function requirements, general

Circuit 15 ON

The electronic ignition lock control unit (N73) transmits the status of circuit 15 via chassis CAN 2 (CAN E2) 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 of the defined kilometer reading and the distance already traveled. The distance traveled is defined via the wheel speeds.

The Electronic Stability Program control unit (N30/4) transmits information on the wheel speeds via chassis CAN 1 (CAN E1), electronic ignition lock control unit and chassis CAN 2 to the instrument cluster. The remaining distance to the next service is determined by the countercheck with 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 by ASSYST PLUS. The remaining distance to the next service is determined by the countercheck with the time of inspection reading reset and stored at 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

Apart from the evaluation factors which depend on the real driving conditions, the ASSYST PLUS also takes into consideration quality factors for determining the service scope and intervals.

The CDI control unit (N3/9) (with diesel engine) or the ME-SFI [ME] control unit (N3/10) (with gasoline engine) sends the following information via chassis CAN 1, electronic ignition lock control unit and chassis CAN 2 to the instrument cluster for this:

Engine speed
Engine oil level
Engine torque
Engine temperature
Engine off time

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/mi
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/mi

The display of the service date is shown accurately in 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 inspection when the appointment is made.

Function sequence for service interval reset

Pressing the O K 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 O K button directly and transmit it via 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 O K button via chassis CAN 1, electronic ignition lock control unit and chassis CAN 2 to the instrument cluster. The "Next Service" message is shown in the multifunction display. 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 be necessary, the current service data must be entered manually.

The following parameters are required for this:

Current km reading/mi reading
Current date
km reading/mi reading at the last oil change (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-9996GN