Citroen Service Manuals - Wiring Diagrams CITROEN C4 2004 Owner’s Manual. Citroen C-Crosser 2011 Owner’s Manual. Citroen C4 Picasso-Grand C4 Picasso Owners Manual. CITROEN C5 2008 Owner’s Manual. Citroen C8 Owner’s Manual. Citroen DS4 2010 Owners Manual. Citroen DS5 Citroen Electric Wiring Diagram. Forums / C4 The Garage / More boot lock problems. - C4 Citroen C4 and DS4 Online Support with user help forums, I posted yesterday about my 2005 C4 boot not opening. an checked every thing else and you are happy it should be working ,that is if you don’t have the problem of severed wiring in the tailgate loom at the hinge. C4 Wiring Diagrams and How to read them / How To Tutorials Basic details of how to read Citroen C4 electrical diagrams. Citroen C4 and DS4 Online Support with user help forums, How To Tutorials C4 Wiring Diagrams and Fuse Box Diagram > Citroën C4 Picasso II (2013-2018) Configurations: The type of electrical system of the vehicle depends on its level of equipment. To identify the type of electrical system on your vehicle, open the bonnet: the presence of an additional fusebox in front of the battery indicates that it is type 2.