I have a wiper assembly from a Jag club member, hoping to fix it for him.
He said it just does not work, the motor does not run.
1) It is from a 1983 XJS, RHD.
Pulled it all apart, the motor is very clean and in excellent condition. Runs well on 12V.
Even the plastic assembly cover which is often dubious looks brand new.
2) I have not been able to find a wiring diagram for this particular Lucas assembly.
It only has 5 wires going to it. See the pdf diagram labelled WIPER.S02.
The microswitch for parking is working and is a simple one pole NC type.
3 wires run direct to the motor, and 2 are just across the microswitch and presumably switch a relay or whatever.
3) I have checked the archives and my collection of wiring diagrams.
My 79 coupe Lucas wiper assembly which I fixed years ago is very different, it includes a solenoid.
Other assemblies seem to have 6 instead of 5 wire connections.
Also other wiring diagrams show dual colour wires nothing like what I have, and not sure what year or if it is Electrolux type.

So does anybody recognise the assembly I am looking at ?
Anybody have the correct wiring diagram ?

 

is the small pip on the microswitch sprung still? It is possible that the spring inside the microswitch has broken and left the thing permanently without a 12v feed. Have you tried 12v directly to the motor, downstream of the switch?

 

The microswitch functions correctly.
It does not switch the motor.
2 wires come into the connection block and they only connect to the microswitch.
The contacts are closed ( NC ) and It looks like they open in the park position.
I am guessing they open in a park position because there is a cam action that only
opens them over a very small arc of the wormwheel.
That suggests the microswitch operates a relay only in the park position, but I wish I had the correct wiring diagram to figure it out.

 

Scrap the Lucas and fit an electrolux. Will swap with an 83 with small mod to switch.

 

Attached

 

I think the wiring is similar regardless, this is all my drawings - not sure if it helps. The later facelift actually has a control module but the mounting for the wiper support frame is totally different, the motors themselves though are not substantially different. For what it is worth I ditched Lucas and went Electrolux, I'd have liked to move to a facelift version but the genius engineers at Jaguar decided to move the mounts on the bulkhead for the frame and I am not taking out the dash to weld in new mounts for it - so don't waste your time with a facelift unless you feel like finding a solution - if you can get hold of the Tesla 'blue' adhesive it is insanely strong but I've not found a source.

 

Thanks for all the replies.
I have most of those wiring diagrams too.
Problem is they have 6 wires to the assembly, not 5, and they have different wire colours.
Also my microswitch is single pole only, and there is no wire going to ground.
If you check the diagram in my first post it simply does not agree with any of these other wiring diagrams.

I can put the whole shooting match back together and check it is functional as far as it goes.
However it belongs to a Jag club member's car, not mine, so I cannot check it works 100% in a car.
I am not able to simply toss it and fit an Electrolux.
Seeing I have found no problem with the assembly it is almost sure to be a problem in the car itself.
Without the correct wiring diagram it is not easy to troubleshoot the car.
I wonder if he checked all fuses !

I can see if anybody on the Jag-Lovers forum has the correct wiring diagram.

 

Those are the only diagrams available as far as I know - the drawings show 6 cores for models with heated washer jets. No way the motor itself needs 6 - I'll have a poke around on the three wiper units that I have and see what falls out - I have different versions after walking the upgrade path available.

 

Here is a picture of one selling for spares on ebay for you to check the wire colours... let me know if you want a close up. Off a 83 my

 

You should be able to tell which wires are the windings by measuring the resistance relative to ground black wire. Lowest resistance will equal highest speed.

 

Not sure what you have there - a Pre HE ?? - I checked the ones I have, two of which are quite early, one is a lever type and one cable and they both have only 5 wires, one going on my car has 6 but it also has heated jets. The very late one has a round plug and a square one and heated jets. If you need pics let me know.

 

At last !
That one looks correct, it has the same connection block and the same wire colours ( 5 wires ) as the one I am fixing.
The problem is, who has a correct wiring diagram for it so I can tell the Jag club 83 XJS owner where to look.
I am fairly sure when I put this wiper assembly back together it will be working as it should.

 

Something stands out with the Lucas wiper assembly I am fixing.
If you look at the photo in the first post, once I cleaned off the moderate amount of grime the condition of it was really good.
For an 83 it is remarkable. I think the almost brand new condition of the black plastic cover that protects the motor and gearbox is the clue.
On my 79 that cover was a very poor design and had a life expectancy of 5 years tops. When I needed to fix the early Lucas wiper assembly in the mid 80s it just disintegrated. Such poor design leads to water getting onto the assembly.
Something for owners to check.