2007 Mercedes S-Class Owner's Manual - Page 399

Controls in detail Driving systems The most likely cause for a malfunctioning system is a dirty sensor (located behind the hood grille), especially at times of snow and ice or heavy rain. In such a case, DISTRONIC Plus will switch off, and the message: DISTRONIC PLUS currently unavailable See Oper. Manual appears in the multifunction display. For cleaning and care of the DISTRONIC Plus sensor, see "Cleaning the DISTRONIC Plus* system sensor cover" ( page 537). This means that: Your vehicle can pass another vehicle after you change lanes. While in a sharp turn or if the vehicle in front is in a sharp turn, DISTRONIC Plus could lose sight of a vehicle traveling in front of it, then your vehicle could accelerate to the previously selected speed. DISTRONIC Plus regulates only the distance between your vehicle and those directly ahead of it. It may not register stationary objects in the road, e.g.: a stopped vehicle in a traffic jam a disabled vehicle an oncoming vehicle The driver must always be on the alert, observe all traffic and intercede as required by steering or braking the vehicle. i If the message: DISTRONIC PLUS currently unavailable See Oper. Manual disappears during driving and the last speed stored flashes for approximately 5 seconds, the dirt (e.g. slush) has dissolved; DISTRONIC Plus is again operational. Another cause might be that the radar sensors have been manually switched off in the instrument cluster control system. Please verify that the radar sensors are switched on ( page 256). Warning! G DISTRONIC Plus should not be used in snowy or icy road conditions. 398