Car display doesn't work Car won't start?

This very unambiguous diagnosis the battery is deeply discharged.

It is very likely – with an even cure battery (first 1 year old) –

that

• it is not properly charged (car only for a short time, but then always with many consumers (light, ventilation, especially heatable rear window or heatable front window, with Renault also electric servo pump for steering and brake)
• not all consumers are sufficient when leaving (sometimes the car radio or an amplifier is sufficient for several days)
• it is no longer loaded (belts, alternator defective) –> but you should get a warning when the car is running)
• you simply consume too much electrical energy when the car only runs short (slim discharge, it always starts worse until “no more” goes)

So: many causes conceivable, although I think it could not be the battery itself, except: it is now broken because

• it was overloaded in summer, for example, and therefore the water content in the battery (“acid level”) is much too low – then the part can quickly break

What now?

• Check battery acid (filling level and density)
• Check battery charge (charge current, on-board voltage) (e.g. by the workshop)
• To start, get the best extra assistance by 2. car, because pushing, for example, only goes when at least the ignition still works
• Then let Karre run and check the first two points here
• Charge battery in addition or as a solution completely with a charger
• Check the warning messages when the engine is running (if the first problem has been solved) – there must be no charging or electrical warning (in case of healing control lights: these lights are all illuminated to control when starting)

If it’s based on the problems that the bastards are getting strong and destined to enter the most important (symbolic or with women power) and otherwise ask someone who understands…

Good luck!