fuse,

check connections on the motor behind the door card (careful with clips),

with motor in on position listen to motor, is it making any noise?

if it is try removing the wiper, does it turn without the wiper on? if yes but not when wiper is on then your rear motor may be at end of its life. don't know where you are but i am breaking a disco 1 which i have used for a donor so could probably let you have that cheap if thats your problem (if near where i pass a can drop off in my travels) as i know mine works.
 
Check the codition of the relay (located behind the plastic kick panel on the left of the passenger footwell) prob be about 3 relays here - can become damp and corrode down there!
 
Sounds a stupid answer - is your drivers door closed?

I spent a good half hour looking for the problem with my RWW till i closed the door - DO NOT ask me the logic behind disabling the RWW when the drivers door is open????
 
Mine wasn't working either when I bought it so, after checking the fuse and relay and then using a circuit tester made sure there was power getting to the motor itself (see below about tailgate being shut), I removed the motor. I stripped it down and found out it was well and truly seized with rust and muck - would not budge at all.

Not wanting to fork out £80 for a new one, or risk a second-hand one for half that, I cleaned up all the working parts (it dismantles fairly easily), paying special attention to the brushes which were looking a little tired, then re-built it and hey presto! Note of caution - if you do decide to take it apart, be careful when you remove the 2 screws that hold the casing on the dynamo, as there are a couple of very small plastic clips that retain the springs for the brushes and these have a tendency to fly off and disappear into the depths of your garage - I speak from experience and had to use the spring from a retractable ball-point pen as a replacement. They worked a treat! :D

As the other guys have said, you must have ALL doors shut when trying it out, especially the rear tailgate as there is a safety cut-out on the interior light switch which ensures the wiper doesn't function when the door is opened. It's apparently to prevent any damage to the wiper, or at least that's what I have read :confused:

It was, i have to say, a most rewarding experience getting it all up and running again. All for the cost of a bit of WD40 and some emery cloth:D

Good luck!
 

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