Henry.adams · Jul 16, 2023

Coming towards the end of my d2 td5 challenge truck build and it’s come to the electrics now and I’m struggling big time. I have about a million questions but I guess my biggest one is can you simplify the body loom on a d2 removing stuff like electric Roofs ect. Or will the confuse the bcu ? I’ve change the factory front and rear lights and replace with after market ones that are not made for a d2 and just cannot get the drivers side indicators to work was wondering if I’ve confused the bcu but chopping bits out and moving earth points all onto one point.
All the wiring is a complete mess and I want to just cut out everything I don’t need but I don’t want to make things worse

Any help would be much appreciated know very little about 12v electronics.

Henry.adams · Jul 16, 2023

Any recommendations on good quality spay connectors too

marjon · Jul 16, 2023

What bits do you want to keep?
Do you need a BCU?

TD5 Immobiliser Bypass Emulator

www.ecux.co.uk

J

Henry.adams · Jul 16, 2023

marjon said:
What bits do you want to keep?
Do you need a BCU?

TD5 Immobiliser Bypass Emulator

TD5 Immobiliser Bypass Emulator

www.ecux.co.uk

J

Only reason really I want to keep the bcu is because of traction control. And it will be road registered so I need everything for mot too

marjon · Jul 16, 2023

Henry.adams said:
Only reason really I want to keep the bcu is because of traction control. And it will be road registered so I need everything for mot too

If its only that side indicator I doubt the BCU is giving you issues. more likely the wiring changes. Have you gone LED?

I dont know the Disco well enough to say anymore sorry.

J

Henry.adams · Jul 16, 2023

marjon said:
If its only that side indicator I doubt the BCU is giving you issues. more likely the wiring changes. Have you gone LED?

I dont know the Disco well enough to say anymore sorry.

J

Yeah leds . passenger side works half the time driver side never works. Headlights work fine just the indicators that don’t. If I can bypass the bcu and keep abs then I will definitely do that

marjon · Jul 16, 2023

I would suspect the LEDs or wiring.

You need someone who knows more, that isn’t me

@sierrafery

J

sierrafery · Jul 16, 2023

Henry.adams said:
Yeah leds . passenger side works half the time driver side never works. Headlights work fine just the indicators that don’t. If I can bypass the bcu and keep abs then I will definitely do that

You can't bypass the BCU, it's way too important, a D2 will simply not work without it... not as to pass a MOT anyway... did you fit resistors for the indicator LEDs? if not that's your problem, if you did means that you messed up something while botching the crcuits and i can't help in such cases only if a fault is on the original setup... unless you made clear diagrams of what you did

Henry.adams · Jul 17, 2023

sierrafery said:
You can't bypass the BCU, it's way too important, a D2 will simply not work without it... not as to pass a MOT anyway... did you fit resistors for the indicator LEDs? if not that's your problem, if you did means that you messed up something while botching the crcuits and i can't help in such cases only if a fault is on the original setup... unless you made clear diagrams of what you did

mystery · Jul 17, 2023

what year is it as the harness changes from 2000 to 2003

Henry.adams · Jul 17, 2023

sierrafery said:
You can't bypass the BCU, it's way too important, a D2 will simply not work without it... not as to pass a MOT anyway... did you fit resistors for the indicator LEDs? if not that's your problem, if you did means that you messed up something while botching the crcuits and i can't help in such cases only if a fault is on the original setup... unless you made clear diagrams of what you did

I haven’t put a resistor or anything wasn’t aware I had to all the led headlights work. What type of resistor do I need ?

And basically all I have done so far to the loom is cut all the earths from the rear half of the car and re ran them into a bus bar.

I want to cut out all the unnecessary wires do you think it will be ok to do so I know the d2 is sensitive when I come to electronics

I also plan on cutting all the wires into the bcu and splicing them longer so I can relocate it . can you see any problems with doing this. I’m considered the the extra resistance could cause problems

Sorry for all the questions

Henry.adams · Jul 17, 2023

mystery said:
what year is it as the harness changes from 2000 to 2003

It’s a it’s a 99

Henry.adams · Jul 17, 2023

mystery said:
what year is it as the harness changes from 2000 to 2003

It’s a 99

sierrafery · Jul 17, 2023

Henry.adams said:
I haven’t put a resistor or anything wasn’t aware I had to all the led headlights work. What type of resistor do I need ?

The D2's headlights have a simple feed through the switch no bulb failure warning while the indicators are through the BCU/IDM for the bulb failure warning as to flash faster if one indicator bulb failed cos it can be dangerous so when you put LEDs for indicators you have to use a resistor on each LED to emulate a bulb's load otherwise the system is mixed up , read this https://www.ozled.com.au/blog/our-blog/led-load-resistors/

Henry.adams said:
I also plan on cutting all the wires into the bcu and splicing them longer so I can relocate it . can you see any problems with doing this. I’m considered the the extra resistance could cause problems

i have no ideea cos i didnt ever think of messing with the BCU's wiring but it's possible to generate some issues if there will be extra voltage drop on the power wires while there are data bus wires for digital signals too which definitely don't like any "intrusion". The Discovery Series II was simply not built as to accept radical electrical modifications IMO, maybe a LR Series II would have no issues with that

tilly2 · Jul 18, 2023

Can you temp refit bulbs to your indicators, just to prove the wirings correct ?

Henry.adams · Jul 19, 2023

sierrafery said:
The D2's headlights have a simple feed through the switch no bulb failure warning while the indicators are through the BCU/IDM for the bulb failure warning as to flash faster if one indicator bulb failed cos it can be dangerous so when you put LEDs for indicators you have to use a resistor on each LED to emulate a bulb's load otherwise the system is mixed up , read this https://www.ozled.com.au/blog/our-blog/led-load-resistors/

i have no ideea cos i didnt ever think of messing with the BCU's wiring but it's possible to generate some issues if there will be extra voltage drop on the power wires while there are data bus wires for digital signals too which definitely don't like any "intrusion". The Discovery Series II was simply not built as to accept radical electrical modifications IMO, maybe a LR Series II would have no issues with that

Yeah I wish I had just put a td5 into a d1 would have been much easier lol . I’ve ordered the resistors and if I do re wire the bcu I will post the results in here.

Henry.adams · Jul 19, 2023

tilly2 said:
Can you temp refit bulbs to your indicators, just to prove the wirings correct ?

Well I know it was working 100% the day I re wired in the leds so it’s something I’ve done. But that might be a idea id I really can’t find the issue

mystery · Jul 21, 2023

try checking header connection on H289- 3 you may have disturbed it when chopping wiring

Henry.adams · Jul 22, 2023

mystery said:
try checking header connection on H289- 3 you may have disturbed it when chopping wiring

What is that mate I’ve searched that code up and can’t find anything on it ?

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