Citroën C5 II RD/TD Fuse box diagrams & schemes Replacing a fuse Before replacing a fuse, you should ascertain the cause of the fault and have it remedied. the numbers of the fuses are indicated on the fusebox. Replace the fuse that has blown with one of the same rating (same colour). Citroen C5 II (mk2) (from 2008) - fuse box diagram - Auto Mar 06, 2016Fuse box in engine compartment Citroen C5 mk2 – fuse box – in engine compartment. To access the fusebox in the engine compartment, undo each screw a 1/4 turn.