Windscreen wipers not working on land rover discovery 300 tdi

SOURCE: not moving in any gear

Have you checked the High-Low ratio lever.  Half-way between High and Low is a Neutral, so no drive to any axle even if a gear in the main box is selected.
Try locking the differential.  If this gives you drive, then it might be a final drive (half-shaft) failure.

SOURCE: land rover disco windscreen washer

Check fuses.

SOURCE: What is the step by step procedure for fitting a

remove top of fan cowling 2 clips draw a diagram of belt route put spanner on tensioner pulley bolt turn clockwise remove belt with assistant helping keep tensioner pulled back fit new belt over pulleys release tensioner onto belt refit cover

SOURCE: On a land rover discovery, windscreen wiper motor,

Ok, here are the wiring colors and functions/destinations. C0030 is the motor connector for the front windscreen.
C0030-1 - Black, runs to a Earth
C0030-2 - White/Green - Fed from the front wiper relay, via the IDM
C0030-3 - Blue/Green - Flick Wipe/Fast Wipe
C0030-4 - Green/SlateGrey - Power from Aux Relay
C0030-5 - Red/Green - Looks to be a speed control connection.

It's hard to tell to be honest, you'd really need to sit down with RAVE and the electrical circuit diagram and the operation description to make head or tail of it.