faulty 'screens' on 806

[Vic Evans]

Cheers Marc
Seems like only two 'wires' to the actual counter. Each number is composed of the required number of the 8 lines required to make the no. 8. It's some of these lines that are not working, eg the mid horizontal line of 3 is missing.
My wife is in England with our 2nd car at the moment & I need transport. I'll have a good ferret next week after her return when any 'damage' I might do to the old Pug that might disable it will not be so important.

[Vic Evans]

I've now taken the panel out again & cleaned, as best I can, the pins with a toothbrush & the plug sockets with contact cleaner sprayed in whilst working the plug in/out.
Nothing has changed & I still get some dodgy numbers !.
Bart Ebben, who supplied the 2nd hand piece, assure me it was Ok when tested & the Controle Tecnique guy has issued me with a new 'pass' valid for two years so unless any of you fine folk can suggest anything else I can do I'll have to be content with that. Thanks for all your help with this.
Happy new year to all.
Vic

[GiveMeABreak]

Hi Vic

Ok, so having another look at the limited data in the diagrams - I think that the common link here is possibly the earth. If the unit is behaving the same as your old one, then it has to be a local wiring issue.

There is not greater detail given the age of the vehicle, but I have determined there is a common earth to part of the instrument cluster that displays the exterior temperature and the odometer. That being the case, I tracked down Earth MC40.

From the following diagram, you should be able to see that there are a bundle of earths (MC40, MC41, MC44 & MC55) that are terminated to an earthing point somewhere in the central area of the dash / bulkhead near the base of the windscreen. It's possible that the connection here may be the culprit due to poor contact / corrosion or condition of the wire at the mounting point.

It may be worth a bit of investigation (try checking from the engine side first) to see if you can find the earthing points. If the contact is poor, then it may be sufficient to create a poor circuit.

Click Image to Zoom

[Paul-R]

From the following diagram, you should be able to see that there are a bundle of earths (MC40, MC41, MC44 & MC55) that are terminated to an earthing point somewhere in the central area of the dash / bulkhead near the base of the windscreen.

That looks to me to be more likely to be at the base of the A panel near the inner sill on the RH side. It's difficult to tell from the diagram but there may be another earth point in the mirror position on the LH side.

BTW Vic, I remember your name from a now defunct forum for English expats in France. I wasn't a frequent poster there and, in fact, stayed away for the best part of the final year after a disagreement with the owners. I only returned for the final week or so and, I think, had the second to last post there before it was closed to further posts.

[Vic Evans]

Thanks Marc & Paul.

I've got a large barn to work in but it's a bit gloomy & I don't fancy grovelling around with a lead light therefor, first decent day when I can work outside I'll give it go at checking out the earths.
I've also got a problem with what appears to be the RH a/c-heating fan running constantly & have ordered a resistor kit so when it arrives I'll give both things a shot. The fan work was dependant on car getting CT but now nothing stopping me sorting it.
Interesting you remember me Paul. Nothing bad I hope.

[xantia_v6]

BTW Vic, I remember your name from a now defunct forum for English expats in France. I wasn't a frequent poster there and, in fact, stayed away for the best part of the final year after a disagreement with the owners. I only returned for the final week or so and, I think, had the second to last post there before it was closed to further posts.

Click!, I could not place the name, but I think remember vic from the FE (nee TF) forum. The spiritual successor to that is the https://newfrenchforum.com/ forum, which coincidentally I help administer, (but I play no part in the moderation or editorial decisions there).

[Vic Evans]

I've finally got a heater fan resister after non delivery & 4 weeks of BS from the original 'supplier' c*rsp*res direct. (check out Google comments & disregard eBay, don't go there.).3 days delivery from auto-doc fr. A bit more expensive but no hassle.
My question is :- do I need to go through the battery disconnect/reset procedure to change this item or will a simple ignition off be OK? My lhd Pug 806 is the 2 fan version with A/C, one fan seems to control fine whilst passenger side is permanently on when engine started.
Whilst investigating I discovered the passenger side air intake box drain blocked which was resulting in damp carpets & presumably caused the fan fan problem as it looks like the only rainwater outlet that side is through the fan if drain blocked.
I'll check out the possible dash earth problem at the same time.
Slowly getting the old gal back into fine fettle now I've got another 2 years CT (MOT) so many thanks for your help folks.

[GiveMeABreak]

I would certainly suggest you do - there are live wires there and you do not want to accidentally short something out. But you don't have a BSI and advanced multiplexing, so it would be sufficient to disconnect the positive terminal and ensure it can't accidentally reconnect whilst doing the work. But no need to go through BSI Reset / Battery Disconnect / Reconnect Procedure.

As for the water drains, check under the front wings - there is usually a drain flap that gets blocked up that allows water to flow out both sides to the road. Leaves and muck can get in under the wipers and air grilles, blocking the drains up.

Items (14) on the diagram show the pipes I am talking about. On the diagram, follow the dotted / dashed lines to see where the pipes connect to under the scuttle. These can easily get blocked. If you can first unblock the ends of the pipes under the arches, then get something non-sharp and work it through the pipes, whilst pouring water on the screen it should help rinse any debris through.

[ekjdm14]

I've finally got a heater fan resister after non delivery & 4 weeks of BS from the original 'supplier' c*rsp*res direct. (check out Google comments & disregard eBay, don't go there.).3 days delivery from auto-doc fr. A bit more expensive but no hassle....


Whilst investigating I discovered the passenger side air intake box drain blocked which was resulting in damp carpets & presumably caused the fan fan problem as it looks like the only rainwater outlet that side is through the fan if drain blocked.
I'll check out the possible dash earth problem at the same time.
Slowly getting the old gal back into fine fettle now I've got another 2 years CT (MOT) so many thanks for your help folks.

1st point doesn't surprise me, I believe they're a "trading style" of ECP. Mister Auto I am told is actually owned/run by PSA so worth checking them out in future maybe?

Second thing, if water has indeed been getting into the interior then the dash issues etc are most likely a result of this & highly possible it's bad earths causing the whole thing. I read the diagram same as Paul I think, MC40 et-al at the base of the right A-pillar behind the carpet/trim so highly susceptible to damp carpet damage. (presume right side is passenger side as you're in France too, so makes sense if the earth point is in fact there)

[Vic Evans]

Thanks folks.
I should have said that I've cleared the blockage which was actually at the drain inlet deep in the air box & bunged up solid. Thankfully with the aid of my wife's small hands, compressed air & lots of water from a garden spray all's good. Have to say I'd never have known the drains were there if I hadn't removed the filters & had a good look inside with a bendy torch I recently bought. Certainly worth knowing for similar type arrangements. I've got a pal, who's a lot more flexible than me, coming to help on Tuesday morning so here's hoping I can cross this problem off the list together with dodgy earth.
Thanks again for advice.

[Vic Evans]

I've just had a 'half hearted' look to see if can see the fan & have unscrewed & folded down the 'felt' cover beneath the glove box.
Pouring with rain outside, gloomy in my barn & granted I haven't spent ages looking but my immediate reaction is "where's the fan?". Lots of wiring with large connectors blocking my admitted dodgy view but can't feel anything I think might be the fan.
I'm expecting the motor & fan spindle to be in the vertical axis & come out downwards.
Anybody (Marc?) know what I have to remove to get at the fan as without standing on my head I'm struggling. It would be nice to know what I'm looking for/at before I demolish too much or do me back in.

[GiveMeABreak]

Which one? You have 2 fans on this one on the left and one on the right:

[GiveMeABreak]

Let me know left or right side (or both) and I'll probably get something (what little I have) on this tomorrow for you.

[Vic Evans]

Thanks Marc. It's the right hand side which is the passenger side in my case.

[Vic Evans]

I've just had another look using a mirror & can see the fan. Trouble is it's got a lot of wiring below it & what I assume is the computer to the left, looking forwards.
Seems like it might be doable if I can clear some space.
How do the large round connectors come apart as splitting these might give me enough room to wrigle the fan unit out assuming I can't replace the resistor in situ.

rubbish photo taken through mirror