86 Instruments and controlsFlashesClutch pedal must be depressed for amain start of the engine 3 16, 3 119.Antilock brake system(ABS)u illuminates yellow.Illuminates for a few seconds after theignition is switched on. The system isready for operation when the controlindicator extinguishes.If the control indicator does notextinguish after a few seconds, or if itilluminates while driving, there is afault in the ABS. The brake systemremains operational but without ABSregulation.Antilock brake system 3 129.Upshift[ illuminates green or is shown as asymbol in the Driver InformationCentre with Uplevel-Combi-Displaywhen upshifting is recommended forfuel saving reasons.ECO drive assistant 3 96.Descent control systemu illuminates or flashes green.Descent control system 3 132IlluminatesThe system is ready for operation.FlashesThe system is activated.Power steeringc illuminates yellow.It illuminates when the ignition isswitched on and extinguishes shortlyafter the engine starts.If the indicator does not extinguishafter a few seconds, or if it illuminateswhile driving, there is a failure in thepower steering system.Seek the assistance of a workshop.Lane departure warning) illuminates green or yellow orflashes yellow.Illuminates greenSystem is switched on and ready tooperate.Illuminates yellowFailure in the system. Seek theassistance of a workshop.Flashes yellowSystem recognises an unintendedlane change.Ultrasonic parking assistr illuminates yellow.Fault in systemorFault due to sensors that are dirty orcovered by ice or snoworInterference due to external sourcesof ultrasound. Once the source ofinterference is removed, the systemwill operate normally.Have the cause of the fault in thesystem remedied by a workshop.Ultrasonic parking assist 3 138.