Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Active service system (ASSYST) Operating instructions - GF00.20-P-0003-01P
Controls of multifunction steering wheel, models 203.0, 203.2
Multifunction steering wheel controls, model 203.7
General information
The Active Service System (ASSYST) is operated using the reset button on the instrument cluster (A1), which is located on the left side of the instrument cluster (A1). The individual menu items CAN-Be selected by pressing the scroll forward/back button (S110s1), as well as the system selection button (S110s3) of the multifunction steering wheel (MFL).
Service indicator can be called up by driver
A function requirement is that the transmitter key (A8/1) is set to position "circuit 15R ON", "circuit 15 ON" or that the vehicle is driving.
The driver must observe the following procedure to display the service indicator:
- Press the system selection button (S110s3) repeatedly until the multifunction display (A1p13) shows the basic display (total and trip odometer) (only necessary if basic display is not yet shown)
- Press the scroll forward/back button (S110s1) repeatedly until the service symbol and the remaining distance, remaining time or service exceeded are displayed.
Resetting ASSYST after an oil change (oil-change reset) on instrument cluster (A1)
A function requirement is that the transmitter key (A8/1) is set to position "circuit 15R ON". The following procedure is required to reset the ASSYST:
- Press the system selection push-button (S110s3) until the multifunction display (A1p13) shows the default image (total and trip recorder). This is only necessary if the basic display is not yet shown.
- Press the scroll forward/back button (S110s1) until the service symbol and the current remaining distance, remaining time or service exceeded are displayed.
- Press reset button on instrument cluster (A1) for approx. 3 s until the multifunction display (A1p13) shows "Do you want to reset the service interval? "Confirm with the R button" is displayed"
- Press the reset button on the instrument cluster (A1) again within 5 s
- The current "Remaining distance" in kilometers or miles appears in the multifunction display (A1p13).
Reset ASSYST (oil change reset) only after changing the oil! The oil change reset should be carried out using STAR DIAGNOSIS if possible!
An inadvertently conducted oil change reset can only be revoked using STAR DIAGNOSIS.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.