circuits are therefore "exploded" into several parts placed on different lines. b) References : Three kinds of references are used : the figures which refer to single parts (and not the wires) - the letters AD, AG, AR...... which refer to the harnesses - the other letters (Bc, F.Gr, FN.BI.. .) indicate the of the wire sleeves. NOTE : For these last references there are 4 possible cases : - Coloured sleeve on a wire whose is not used as a reference marker : on diagrams : Bc, Bl, Ve, GR....