Discovery 1 300TDi Eelctrical fault

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jonwill

Member
Posts
16
Hi All,

I'm at a loss with my D1 currently. I have an electrical issue relating to exterior lighting and interior equipment.
Basically with my Headlights switched on the dipped beam they appear dim, Not too much of an issue as I'm aware D1 lights are awful, However if I use mt Right Indicator at the time they are switched I loose all poer within the interior. Radio switches on/off at the same rate as the indicator as does the instrument cluster back lighting. Rev counter fluctuates along with the speedo at the same time. Now this only happens with the RIGHT indicator not the left. Left indicator works perfectly fine without interrupting any other function.

I have replaced the fuse board next to the steering column for an known good one just in case it was a water issue causing a short (leaky sunroofs) this made no difference. I have also replaced the steering column switch gear for the lights and wipers, this made no difference either.

To add to my list of annoying electrical issues my intermittent wipers and my wash/wipe do not work (set to stage 1 or pulled towards the steering wheel to spray screen). Could this be related or is this a separate issue again.

If anyone has any suggestions it would be much appreciated
 
Sounds like a massive leak to earth through some part of the wiring to the right hand indicators.
Do they work?
Have you tried taking the bulbs out of them then going through the same sequence to see if the strange happenings are repeated?
Changing the switches has not improved things so the fault must be in the wiring, or maybe a relay. you could try pulling the fuse to the indicators and/or its relay, if it has one. (Manual not to hand)
Best of luck
 
Ok, let’s assume your talking about the 300 series D1, therefor headlights are not dim unless there’s a fault such as an iffy earth connection plus iffy head lamp bulbs of course.
Next, earth connections seems to be issue, and any delays that are available, wipers, interior lights are generated by the multi function unit (MFU) which is positioned behind the fuse board it also controls other things like rear fog lights,
Wash wipe not spraying may be a faulty pump as simple as that.

Fault finding is taking one item at a time. It is known that there is a possibility when one items fault is cleared another one that’s related electrically is also cleared.
 
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Sounds like a massive leak to earth through some part of the wiring to the right hand indicators.
Do they work?
Have you tried taking the bulbs out of them then going through the same sequence to see if the strange happenings are repeated?
Changing the switches has not improved things so the fault must be in the wiring, or maybe a relay. you could try pulling the fuse to the indicators and/or its relay, if it has one. (Manual not to hand)
Best of luck
Thanks for the reply. I believe it to be a short to ground but unsure where to start really. All lights work. I have tried with the indicators disconnected on the right but no difference in operation. I will check the manual and try disconnecting the fuse/relay and report back when I have some spare time over this week.
 
Ok, let’s assume your talking about the 300 series D1, therefor headlights are not dim unless there’s a fault such as an iffy earth connection plus iffy @bulbs of course.
Next, earth connections seems to be issue, and any delays that are available, wipers, interior lights are generated by the multi function unit (MFU) which is positioned behind the fuse board it also controls other things like rear fog lights,
Wash wipe not spraying may be a faulty pump as simple as that.

Fault finding is taking one item at a time. It is known that there is a possibility when one items fault is cleared another one that’s related electrically is also cleared.
Yes my apologises it is a 300 series D1. Headlights dim isn't a concern as such just an observation. The MFU which fuse board is this in relation to? Is there only the one on the drivers side or is there a passenger side one too? The earths on these vehicles, are they direct to the body or do they return through the wiring loom?
 
Yes my apologises it is a 300 series D1. Headlights dim isn't a concern as such just an observation. The MFU which fuse board is this in relation to? Is there only the one on the drivers side or is there a passenger side one too? The earths on these vehicles, are they direct to the body or do they return through the wiring loom?
MFU is responsible for any delay ie wipers, interior lights, security system + other stuff that I’ve forgotten about at the moment :(
Earth points there 4 or 5 major ones in the engine bay, one is to the body just behind the battery but if the vehicle starts their not the issue the local ones could be, at the rear of the head lamps, both front foot wells behind the kick panels and in the boot neat the rear lights.

I don’t have a manual either at the moment not that I need one :)





Sent from my iPad on a train.
 
Wot you doin on a train, this time O night?
It’s rare I know but I had eight engineers on site from 7pm to move data wiring and fire detection stuff working around other trades with an office floor change, so a bit of managing was required, job priced for eight hours so we finished early so theres a bonus for the guys.
Pubs were close so I’m lucky I didn’t have to buy the first round as u do... so a hasty walk across the bridge to London Bridge Station.
20mins to go and I’m home :)




Sent from my iPad on a train.
 
MFU is responsible for any delay ie wipers, interior lights, security system + other stuff that I’ve forgotten about at the moment :(
Earth points there 4 or 5 major ones in the engine bay, one is to the body just behind the battery but if the vehicle starts their not the issue the local ones could be, at the rear of the head lamps, both front foot wells behind the kick panels and in the boot neat the rear lights.

I don’t have a manual either at the moment not that I need one :)





Sent from my iPad on a train.
Thank you. Where is the MFU located? Sounds like that could be playing a major part of my issue as my central locking causes me greif too. I'll pull the kick panels and have a good check over the earth wiring and make sure all is good.
 
The MFU is plugged into the rear of the fuse board, its either coloured black or cream for the later item. The is an MFU diagnosis feature available, how to access that has already been posted on the Forum.
The MFU isn’t involved with central locking... can you lock with the key and unlock with the remote fob?
 
The MFU is plugged into the rear of the fuse board, its either coloured black or cream for the later item. The is an MFU diagnosis feature available, how to access that has already been posted on the Forum.
The MFU isn’t involved with central locking... can you lock with the key and unlock with the remote fob?

Excellent thank you. The central locking works of the key to both lock and unlock. I don't have a remote fob for it. The central locking basically has a mind of its on when the electrics starting playing up. If the lights are switched on or the indicators or any other consumer it will lock itself, if you unlock it it will just lock again as soon as a consumer is switched on if that makes sense which leads me to believe the issue is with a common denominator that it can't see to locate as of yet
 
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