Active service system (ASSYST PLUS), function - GF00.20-P-0004CA
MODEL 207.3/4
Function requirements, general
- Terminal 15 ON
The electronic ignition lock control unit (N73) transmits the circuit status of circuit 15 via interior CAN (CAN B) to the instrument cluster (A1).
Active Service System PLUS (ASSYST PLUS), general
The ASSYST PLUS calculates when the vehicle is due for a service. Either after a precisely defined kilometer mileage 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 control unit, which is integrated into the instrument cluster as a software solution. The ASSYST control unit takes into account the time and distance-dependent additional operations in accordance with the vehicle equipment. The service scope and the time that the service is due are displayed via the multifunction display (A1p13) 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
When determining the remaining distance, the wheel speed recorded by the left front axle rpm sensor (L6/1), the right front axle rpm sensor (L6/2), the left rear axle rpm sensor (L6/3) and the right rear axle rpm sensor (L6/4) is read in by the Electronic Stability Program control unit (N30/4) (up to 31.05.2013 without code (233) DISTRONIC PLUS or as of 01.06.2013) or by the Premium Electronic Stability Program control unit (N30/7) (up to 31.05.2013 with CODE 233 (DISTRONIC PLUS)), and up to 31.05.2013 transmitted via the chassis CAN (CAN E) or as of 01.06.2013 via chassis CAN 1 (CAN E1), the front SAM control unit with fuse and relay module (N10/1) and the chassis CAN 2 (CAN E2) to the instrument cluster. The instrument cluster uses the received values to calculate the travel distance covered and processes this in the ASSYST control unit.
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.
The service interval based on remaining distance is permanently stored in the ASSYST control unit and is 25, 000 km for "Service A" or 50, 000 km for "Service B".
Function sequence for determining the remaining time
The remaining time is determined in the ASSYST control unit. The remaining distance to the next service is determined by the comparison with the time of service 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.
The service interval based on the remaining time is permanently stored in the ASSYST control unit and is 12 months for "Service A" and 24 months for "Service B".
Function sequence for evaluating data
Apart from the evaluation factors which depend on the real driving conditions, quality factors for determining the service scope and intervals are taken into account by ASSYST PLUS. To do so, the ME-SFI [ME] control unit (N3/10) (with gasoline engine) or CDI control unit (N3/9) (with diesel engine) transmits the following variables via the chassis CAN up to 31.05.2013 or via chassis CAN 1 as of 01.06.2013:
- Engine speed
- Oil pressure
- 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:
- Service XX in XX days
- Service XX in XXXX km/miles
- Carry out service XX
In the event that the service 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 date is rounded to 100 km or 100 miles or 5 days. 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 scope of the service and the figure behind it 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
Pressing the OK button (S110s6) in the left multifunction steering wheel button group (S110), service can be reset.
The request is read in by the steering wheel electronics (N135) and sent over the steering LIN (LIN E1) to the steering column tube module control unit (N80). The steering column tube module control unit forwards the request via the chassis CAN up to 31.05.2013 or via chassis CAN 1, the front SAM control unit and chassis CAN 2 as of 01.06.2013 to the instrument cluster.
The multifunction display shows the message "Next service". If the OK button is pressed for longer than t = 3 s, the multifunction display shows "Maintenance interval reset". 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)
| Overview of system components, instrument cluster (IC) component description | GF54.30-P-9996CA |