Hoping someone out there could help me out. Dad has a 58 plate (reg 30/01/2009) 1.6 diesel C4 Picasso. Up to now he has had no problems with the car until this morning. The parking brake would not release when pulling away from outside the house (on a slight upward gradient). Compare Citroen C4 Grand Picasso Electrical Faults prices near you with WhoCanFixMyCar. It takes seconds: compare competitive Electrical Faults prices and customer reviews from local garages, Citroen car Mechanics and even Citroen dealers before taking your pick! Plus you can book in online. We also offer Citroen servicing and other common The most common electrical issues are related to the wipers, the lightning system, and the battery. The starter motor is also a known issue for the C4 Picasso as it often fails to start the car up. Most sources state that this issue is due to a problem with the wiring harness. All in all, there are many other potential electrical issues, but Common Citroen C4 Wiring Diagrams. The specific wiring diagrams for a Citroen C4 will depend on the year and version of the car. However, here’s some of the more common parts and components you’ll come across in a Citroen C4 wiring diagram: Ignition system. Dashboard. Starter switch. Thanks for that data. Thankfully, I have managed to get the car started this morning - probably more luck than judgement ! I pressed the little priming pump on the filter loads of times, tried to start the engine, it spluttered and nearly died, so I quickly pressed the throttle pedal down and it luckily picked up the revs and then with one or two more splutters it was fine ! 7VpZCrj.