New Thread old topic Rear Wiper not working

[tinhat]

Hi guys and Gals,
Ftrying to get my rear wiper on a Disco M reg (94) to work.
Originally the wiring from the switch had been cut and the supply used to feed a CB radio!.
I managed to sort this and have reconnected the wiring to the switch and reconnected the switch.
I still had rear washers but no wipe. I took the wiper out of the back door and ran it direct from the battery, and that seemed to work OK.
Then 'discovererd the MFU, what a rigmarole this is I thought.
Anyway followed the RAVe instructions and got some of the correct feedback.
Mode 1
No heated front widow so no switch.
Rear washers fo not create a bleep, but work. Same with rear fogs.
Front wash and wipe OK as well as lights etc.

Mode 2,
Lights appear to work , front wash and wipe work, but rear wiper does not.

Can anyone tell me EXACTLY where the rear wiper relay is! I can hear the front one click in, but nothing when the rear is supposed to switch.

Also any common faults with the wiper assembely, that can be relatively easily remedied.
Also is the rear wiper not working an MOT failure.

TH take care out there

 

[Davee]

It might sound a silly question, but, are you trying the wiper when the car is stationary ?
I just had a really weird fault on mine when I was getting it ready for the mot.
I changed the rear wiper blade, changed the front blades, adjusted the washer jets, then thought I'd check the rear jet.
Pushed the button, loads of water but no wiper.
Bollox !!

Tried again, and again. Ignition on, engine on, engine off, Nothing.
Took the switch apart, took the door apart, cleaned all the connections, took all the fuses out, checked and cleaned them, Nothing. :5bbanghead:

Told the missus to drive it around the block and try it out after the service.
30 seconds later she's driving down the road with the rear wiper working happily !!! :wtf:

Since then, it's been working fine. But for that time, AND one other time exactly like it when it was stationary, it didn't want to play. Perhaps the rev's weren't right for the relay, who knows?

Don't know if it's an mot check, I was told that it wasn't though.

 

[Davee]

Thinking about it again, and probably answering my own question. I probably had one of the rear doors on the latch.
I think that this is enough to prevent the rear wiper from working, doesn't the cct require all doors to be fully closed ?

 

[tinhat]

Thanks guys, have not checked it 'in motion' I'll have to give it a go.
The door switches all appear to work, the alarm/imobilser sulks if one is open. the interior lights all work and switch with the relevant doors. so I presume all the switches are OK.

any other advice would be greatly appreciated,
Best Regards TH

 

[tinhat]

Further information on Diagnostics
Removed the wiper motor.
Checked that it works ok on a seperate battery supply.
Appears to be fully finctional when the moter is energise (two pin connector)
Removed the plastic cover over the gear mechanism. I;ve had wiper motors with corroded copper in the 'at rest switch area before.
It appears you can't get at the switch stuff.
All the shafts are peaned on. I also noted that there were two pices of black plastic (like gear teach, but bigger thant he white gear wheel (which is K) in the gear on the skew gear.
Checked for a switched live to the 'at rest switch' connector. it appears that there is a switched live(ign ON) to the centre pin of the 3 pin connectors, nothing on the others.
Is there nay wasy of modding the wiring to get it to work. I don't mind using the switch the time the turn off. but I obkect to paying vast amounts of hard earned cash for a second piece of crap design.
ANy help would be appreciated, even if its not for a Disco 300TDI, I may be able to 'botch a fix.
Thanks very much
TH

 

[elmer_d]

Thinking about it again, and probably answering my own question. I probably had one of the rear doors on the latch.
I think that this is enough to prevent the rear wiper from working, doesn't the cct require all doors to be fully closed ?

Drivers door open = no rear wiper

standard system, don't know why but thats how it is

design intent
=========================

Rave says

Relay K183 behind LH foot well panel top level 2nd one in
Fuse 18 10 amp facia fuse box

Have you checked the earth behind the rear speaker panel drivers side?


Green Orange wire should be perm live +ve
Brown Green should be live when relay activated
Brown Yellow links GO wire to motor when activated (not parked)

 

[Nig]

Drivers door open = no rear wiper

standard system, don't know why but thats how it is

design intent
=========================

Rave says

Relay K183 behind LH foot well panel top level 2nd one in
Fuse 18 10 amp facia fuse box

Have you checked the earth behind the rear speaker panel drivers side?


Green Orange wire should be perm live +ve
Brown Green should be live when relay activated
Brown Yellow links GO wire to motor when activated (not parked)

Driving to work this evening and testing everything works after a bit of a lay up I forgot the rear was on a switch.
Messed with the front wiper stalk trying to get the rear on then pulled up and checked I hadn't trapped the arm with the spare wheel having refitted it a few days ago.
Remembered the switch as I went to get back in the car and pressed it whilst door open

Quick search for common faults before I started stripping things down has saved me some time and swearing

Cheers

 

[Johndisco2]

Ok so after cleaning, testing, adjusting I gave up and bought a new motor, then sat reading this find out drivers door has to be shut And yes it worked, but inside the motor was a bit burnt out and motor brushes were sticky anyway, worst bit was I had soldered a wire back which wasn't ideal but held Until.......I dropped my old one and now it doesn't work at all so I give up new motor from fleabay on route! The top tip I can offer is if you catch it early enough and free up the gears and clean out the area and your motor is ok you can pop a drill on the back of the motor to clean up the gears and such only after you free it all off though, doingvthis gives you the ability to spot any tight spots in the nylon gear and clean them, where mine had seized the gears were worn down so a sharp flat head between each tooth helped a lot, just keep your drivers door shut when testing all the best thought this might make someone laugh!

 

[Ipcress]

Drivers door open = no rear wiper

standard system, don't know why but thats how it is

design intent
=========================

Rave says

Relay K183 behind LH foot well panel top level 2nd one in
Fuse 18 10 amp facia fuse box

Have you checked the earth behind the rear speaker panel drivers side?


Green Orange wire should be perm live +ve
Brown Green should be live when relay activated
Brown Yellow links GO wire to motor when activated (not parked)

####

Landyzone eh, all the answers are here!
Testing the alternator this morning for regulated output as per spec.
Problem is power available to spots when over 65mph, not relevant here, but all fine in normal operation ex spots etc.
Decided to clean relay connectors to spots (wired into MBs)... Shorted briefly!?
So afterwards decided to check electrics were working because of short, although should not have as nought to do with.
The only thing that did not work as I tested with driver's door open was... Yes the rear wiper!
Check fuses, all okay. Before anything else checked here.
Where would we (I) be without LZ..
Design Intent? Suppose its better than all the lights going out and the tyres deflating, ho hum!
There is nothing quite like my D1V8, and nothing I'd want in its place either.