86 Instruments and controlsFlashes briefly when the engineis runningThe system is temporarily disabled.Flashes continuously when theengine is runningSystem fault. Seek the assistance ofa workshop immediately.All wheel drive 3 132.Descent control systemu illuminates yellow and/or green.Both the yellow and green controlindicators illuminate briefly when theignition is switched on.GreenIlluminates when system is ready foroperation.Flashes during driving when systemis in operation, after pressing the ubutton.YellowFlashes to indicate system is notready for conditions to operate.Illuminates to indicate there is a faultin the system.If it flashes or illuminates duringdriving, friction material needs to cooldown: drive the vehicle withoutbraking as much as possible.Descent control system 3 138.Power steering2 illuminates yellow.When the ignition is switched on, 2illuminates briefly. If it does notilluminate, stays lit or illuminatesduring driving, there is a fault in thesystem. Seek the assistance of aworkshop.Power steering 3 121.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 3 140.Electronic Stability Controlb illuminates or flashes yellow.When the engine is started, billuminates briefly. If it does notilluminate, seek the assistance of aworkshop.IlluminatesFault in the system. Continued drivingis possible. Driving stability, however,may deteriorate depending on roadsurface conditions.Have the cause of the fault remediedby a workshop.