Disco 1 Wiring

Hi every one. Hoping for some old schoolers tho help with my Disco 1. 1999 plate 300tdi manual.
It's actually a M/Y 1998.
Either a wiring diagram for that model year. Mine does not have the dim dip resistor.
Headlights not working after rain. Not relay. Think water must be somewhere causing a short as it's now working???
I managed to jump the wrong two contacts on the relay and toasted the insulation for the black wire that goes to the multi function unit. I will need to run a new wire. I knew I should have got my glasses
Anyway. A complete writing diagram for that year would be perfect but just the headlights would be perfect too.
Thanks

The electrical wiring diagram is for the 300 series D1 1995-98MY. You will find it the LR electrical manual, and Haynes also has one.

If the dim-resistor is missing or just disconnected it doesn’t matter as the headlights will still function as they should.

The bad news is possibly the MFU may be now toast, as its full of electronic components. What ever the electrical system its a good rule to to isolate it before working on it.

currymunster said:

A complete writing diagram for that year would be perfect but just the headlights would be perfect too.
Thanks

Click to expand...

Hi. Download and save it to your PC then open with Adobe or other PDF reader to be able to select the chapters cos this file willl be disabled in 48 hours or so: https://smallpdf.com/file#s=59b600d3-b580-4118-b9b9-6fe7afbe979b ... it's not a very human friendly kind of doc, read the instructions how to use it and if you are not technically challenged you'll understand

discool said:

The electrical wiring diagram is for the 300 series D1 1995-98MY. You will find it the LR electrical manual, and Haynes also has one.

If the dim-resistor is missing or just disconnected it doesn’t matter as the headlights will still function as they should.

The bad news is possibly the MFU may be now toast, as its full of electronic components. What ever the electrical system its a good rule to to isolate it before working on it.

Click to expand...

Yes, my car died not have a dim dip resistor in the location specified in my 95 electrical wiring document from land rover. I assume it was stopped by land rover. I don't believe the MFU is toast as the lights are now working. It tipped it with rain for two hours which I think is what caused them to stop working. I had side lights and main beam but no dipped beam. But like I said all working now. This happend to my indicators a while back. Water had got into a connection block under the glove box and caused the left indicator to stay until on permanently. I'm sure this is the same issue somewhere but I now need to replace the wire going from the relay tho the MFU.
As for being an idiot. Well, I regret it now.
I know what I should have done but it's ..... Just quickly check if the lights work if I bypass the relay... I just read the contacts wrong.

sierrafery said:

Hi. Download and save it to your PC then open with Adobe or other PDF reader to be able to select the chapters cos this file willl be disabled in 48 hours or so: https://smallpdf.com/file#s=59b600d3-b580-4118-b9b9-6fe7afbe979b ... it's not a very human friendly kind of doc, read the instructions how to use it and if you are not technically challenged you'll understand

Click to expand...

Great form. Many thanks. Exactly the same layout as the 95 one I have. I don't seem to see a headlight relay on it anywhere though? Mine does have one. Is it an American one? Do they not use relays? Or am I just not seeing it or reading it correctly

currymunster said:

Great form. Many thanks. Exactly the same layout as the 95 one I have. I don't seem to see a headlight relay on it anywhere though? Mine does have one. Is it an American one? Do they not use relays? Or am I just not seeing it or reading it correctly

Click to expand...

I have no ideea, corroborate the diagram with the connector view which points to the dilematic relay but if the PO botched up the circuit the troubleshooting can become a nightmare. Good luck

sierrafery said:

I have no ideea, corroborate the diagram with the connector view which points to the dilematic relay but if the PO botched up the circuit the troubleshooting can become a nightmare. Good luck

Click to expand...

Thanks. I'm pretty sure this cat is still original. I'm want to find out if the black wire from the relay goes straight to the MFU or does it go into a terminal block or something on the way. I need to replace it see. Thanks for your help

Had a chance to look at it. The black wire on 86 of the relay is the one that's toasted. I have traced it back to a "header?" Plug under the fan motor. It's toast to there which can't be longer than half a metre. It looks like it's an earth wire to chassis ground? Continuity test shows that.
95 diagram shows a dim dip resistor and the relay. It then shows the black going to the MFU.
The 97 diagram shows the headlights without a relay. So why did my 98My registered in 99 have a relay? And the black wire doesn't go to the MFU? Is there a later diagram perhaps.
Any ideas???

The black wire from the dim- dip relay goes straight to the MFU, if there is a relay installed then its only function is to operate/provide the earth for the dim-dip relay to switch and provide the function which is via a resistor mounted on the rear bulkhead.
So if you wish to have this system install the resistor, simple if the wiring still exists

I unplug my discos resistor as the head lamp illumination looked a bit naff with the bright LED sidelight bulb along with the dimmed headlamp bulb.

Theres no other relays in the lighting circuit… when the vehicles left the factory.

If the MFU has escaped any damage then the various items that it controls i.e wiper delays will still function, rear fogs illuminating is other one, the is a MFU function test, press a few buttons and the system will through the systems involved its all explained in the manual.

LR finished the D1 production in 1998 when few demo D2 were now in the showrooms to drive which I did while my D1 was in for service. I still have the brochures handed out.







Sent from my iPad on a train.

discool said:

The black wire from the dim- dip relay goes straight to the MFU, if there is a relay installed then its only function is to operate/provide the earth for the dim-dip relay to switch and provide the function which is via a resistor mounted on the rear bulkhead.
So if you wish to have this system install the resistor, simple if the wiring still exists

I unplug my discos resistor as the head lamp illumination looked a bit naff with the bright LED sidelight bulb along with the dimmed headlamp bulb.

Theres no other relays in the lighting circuit… when the vehicles left the factory.

If the MFU has escaped any damage then the various items that it controls i.e wiper delays will still function, rear fogs illuminating is other one, the is a MFU function test, press a few buttons and the system will through the systems involved its all explained in the manual.

LR finished the D1 production in 1998 when few demo D2 were now in the showrooms to drive which I did while my D1 was in for service. I still have the brochures handed out.







Sent from my iPad on a train.

Click to expand...

Still got the brochures.... That's impressive. What a throw back. Well done for not tossing them
This is a weird one. It's definitely a 98 model. Parts on car like window lift motor and door trim are dated August 1998 I think. It was registered may 1999 as a special edition safari model in green with front spots, roof rack and ladder, side steps and air con.
I definitely have a relay for the headlights. It clicks when I turn the dipped beam on and the dipped beam do not work if I remove the relay.
According to the 95 diagram it should be in the hinge down rack under the glove box. Not so. It's on the left hand side of the passenger foot well. Behind the side panel. It's the relay nearest the bulkhead. It has the proper land rover connector which fits on the hook thing. Coming from the main loom all taped as like original. It used to be the original yellow relay but I replaced it a year ago.
The black wire from terminal 86 goes to a header plug in the main wiring loom just under the fan housing. I have cut the loom wrap to find.
The wire going into that has the insulation melted as well and when I do a continuity test from the header to the relay 86 it beeps. It also shows as continuity to chassis ground. I can get pictures if you like. I remember when the relay went a year ago it took me ages to find as it's not where my diagram states. If I remember rightly it was the same issue. Not working then it did which is how I found the relay from clicking when turning on. I replace it thinking of must be an intermittent relay fault.
Guessing now it was really water. Looks like the air intake is leaking but I suppose it could be windscreen or roof bar mounts. Unlikely to be sunroof as the are sealed shut...lol
This sends to be a mystery. Would the vin help?
Thanks
James

I just realised that i gave you te wrong doc cos that's for LHD export modells not UK specs, here is the good one https://smallpdf.com/file#s=6b9a899f-c789-4cdc-8c6a-e9b4d8858614 which shows 2 relays ... now check the connector views section for C293 and C2109 and tell which one is the relay you described, should be K235 if the B wire goes to the MFU

currymunster said:

Had a chance to look at it. The black wire on 86 of the relay is the one that's toasted. I have traced it back to a "header?" Plug under the fan motor. It's toast to there which can't be longer than half a metre. It looks like it's an earth wire to chassis ground? Continuity test shows that.
95 diagram shows a dim dip resistor and the relay. It then shows the black going to the MFU.
The 97 diagram shows the headlights without a relay. So why did my 98My registered in 99 have a relay? And the black wire doesn't go to the MFU? Is there a later diagram perhaps.
Any ideas???

Click to expand...

For the UK specification D1 here’s no later wiring diagram, for the rest of the world who knows.
The only thing I noticed on a new1998 disco in the showroom was that they were fitted with an high level brake light and a dash control to adjust the headlamps.

try

The correct the dim-relay relay was yellow…when your vehicle left the factory positioned on the end of the row of four relays, if I remember correctly, and installed on the hinged “gate” its a bog standard relay and there’s a few in you vehicle, VWB 1002L is the number.
As your vehicle, vehicles from TA vin the relay is number I, as shown in the diagram post#11.
Vehicles 1995 were MA and the relay is number 2.
Both have the same relay, but i’m sure you have already noticed in the diagram the difference that one circuit includes the MFU.

My 97 disco was VA so 98 will be WA i expect