Excellent writeup and the link to http://www.dgce.co.uk/ will be very helpful.
Lost my wipers on way for late night snack in t-storm tonight. Checked fuse #1 (30 amp) in glovebox and was intact, swapped another known good and still no wiper joy.
Made it home without wipers and found this thread (with links).
Will do a short term diagnosis on the relay tomorrow a.m. and order a new one in any event. Found wiper motor from rockauto.com (A1 Cardonne remanufactured) for about $130 which sure beats the dealer and others with 20% discounts to get to a still-way-to-high $270.
Wiper motor: #67638360603
#3. CENTRE ENGINE COMPARTMENT CLOSING PANEL #51718174739
#15. LEFT ENGINE COMPARTMENT CLOSING PANEL #51718174737
... as mine are crumbling from the engine bay heat and age (pieces dropping down onto bell-housing) and the center piece is kind of important in keeping engine wiring harness off of the top back of the cylinder head. (ya think)
Will take some pics.
2000 528iT Sport 5M (mfg. 5/1999) ~ 1990 325iX 5M
BMW CCA member #130075