and what diagram would you like I take it it's 300tdi and judging by connections in image early bullet connectors does it Have immobilisation ,Alarm , EGR, Air con ,Egine control module etc fitted
and I take it problems with rear fog (does it have a rear fog ECU ) and the blower motor more info please .the wiring looks untidy but use of a good harness tape will sort it don't be tempted to
use tie wraps as these tend to crush the cable insulation and I have found especially on thin wall cable that the copper strand tends to powder in time if they over tightened the usual sign is a faint discolouration
of the insulation where the tie wrap was fitted