TD5 wiring. Help !!!

L90 BCM · Jan 4, 2014

Hi all I am in the process of stripping down my wiring loom and wondered if someone knows what this bit is for?
I have searched and I think it is where you can plug in a relay to prevent a caravan from draning you car battery when the engine is of. If so does any one know where I can buy it from? Thanks Ben

I think it normally sits in the back corner , not sure as it's out of the vehicle now lol

L90 BCM · Jan 5, 2014

I have found where it sits, while looking through p38's d2 build ha ha
This is his picture

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listerdiesel · Jan 5, 2014

It is connector C0905 which is involved in the rear fog light circuit to the trailer socket, looks like it just links two bits of loom together, probably the LH and RH vehicle fog lights and the towbar socket feed:

Your relay should be part of the main fusebox under the bonnet, details of fitting the relay are given in the towing electrics fitting details in RAVE.

Peter

L90 BCM · Jan 5, 2014

Cannot thank you enough

just what I was after, at least I know that it needs be be there and stay connected

for what I want to do.

I don't suppose you would know which wires would need bridging to fool the alarm system that a door is locked/shut ?
I am basically making a 5door disco into a 2 door defender, and I want to keep the alarm

listerdiesel · Jan 5, 2014

Not without trawling through the schematics, which I haven't got time for right now.

Peter

L90 BCM · Jan 5, 2014

Ok pal , ill crack on attempting to strip the loom down, I find that hard enough lol

listerdiesel · Jan 5, 2014

The alarm is a bit involved to say the least, but the driver's door switch lead is Purple/White going into the BCU at C0660-17, and the four others doors combine into a Purple/Light Grey going into the BCU at C0660-4.

Peter

L90 BCM · Jan 5, 2014

Yes that would make since as one press of the unlock just does the drivers door and then a second press releases the other four

Where are you finding all this great knowledge, I attempt to look at the wiring diagrams on the web but it's a bit confusing lol, and I am studying bloody electrical electronic engineering. Ha ha god help me

L90 BCM · Jan 6, 2014

Another quick question.
Do you know what the green with a orange trace wire is that I believe to be the earth for the rear light, but I am not sure as it's not black lol ?

brian47 · Jan 6, 2014

L90 BCM said:
Where are you finding all this great knowledge, I attempt to look at the wiring diagrams on the web but it's a bit confusing lol, and I am studying bloody electrical electronic engineering. Ha ha god help me

The schematics that you've seen on this thread are from the RAVE CD (disc 2 iirc for disco 2 and freelander).

There are links to the RAVE downloads in numerous places on the forum.

listerdiesel · Jan 6, 2014

L90 BCM said:
Another quick question.
Do you know what the green with a orange trace wire is that I believe to be the earth for the rear light, but I am not sure as it's not black lol ?

All grounds are black, so it is probably something not lights-related.

Green with orange tracer comes off the passenger fusebox and goes to the brake pedal switch, then with a reversed orange with green tracer to the engine ECU etc.

Green with RED tracer is the LH indicators.

The same colour scheme can be used for different areas, where is this wire located?

Peter

L90 BCM · Jan 6, 2014

listerdiesel said:
All grounds are black, so it is probably something not lights-related.

Green with orange tracer comes off the passenger fusebox and goes to the brake pedal switch, then with a reversed orange with green tracer to the engine ECU etc.

Green with RED tracer is the LH indicators.

The same colour scheme can be used for different areas, where is this wire located?

Peter

It is located in the headlining loom it comes from, as I can see the bottom passenger corner brown connector, the one with the heater rear window winning in it lol and then I goes all the way to the rear light I think. Might be wrong as the loom is out the car and on the lounge floor

PaulMc · Jan 7, 2014

L90 BCM said:
Hi all I am in the process of stripping down my wiring loom and wondered if someone knows what this bit is for?
I have searched and I think it is where you can plug in a relay to prevent a caravan from draning you car battery when the engine is of. If so does any one know where I can buy it from? Thanks Ben

I think it normally sits in the back corner , not sure as it's out of the vehicle now lol

That connector is a 'jumper' to complete the rear fog lamp circuit to the towing electrics pickup connector.

There's an optional relay that plugs-in at that connector (the 'jumper' is removed and disgarded), which cuts-out the vehicle's rear fog lamps when a trailer is connected to the towing socket.

The kit is part number - STC50181

It uses an unusual 3-terminal relay, which has its coil in series with the trailer connector's rear fog lamp(s) circuit, so that, with a trailer connected and the rear fog lights turned-on, the coil is energised and the relay's contact opens, thus disconnecting the vehicle's rear fog lamps.

The trailer's fog lamp(s) are then powered through the relay's coil.

I have a drawing of the circuit somewhere, I'll post it, when I find it.

.

PaulMc · Jan 7, 2014

L90 BCM said:
It is located in the headlining loom it comes from, as I can see the bottom passenger corner brown connector, the one with the heater rear window winning in it lol and then I goes all the way to the rear light I think. Might be wrong as the loom is out the car and on the lounge floor

That will be the Light Green/Orange trace wire, which goes from C0485/C0480 in the LH footwell, to the radio aerial amplifier, mounted up in the RH side of the roof.

.

PaulMc · Jan 7, 2014

L90 BCM said:
Cannot thank you enough just what I was after, at least I know that it needs be be there and stay connected for what I want to do.

I don't suppose you would know which wires would need bridging to fool the alarm system that a door is locked/shut ?
I am basically making a 5door disco into a 2 door defender, and I want to keep the alarm

The micro-switches in the door locks, switch the signal wire from the BCU to earth when a door is opened.

As Peter has said, the driver's door is on a separate circuit to the other doors, which are all in parallel, on the same circuit.

So, you can just leave the rear side and tail door harnesses disconnected and then, as far as the BCU knows, all the doors are present and closed.

As, there's no separate door harness for the tail door (its wiring is at the tail-end of the roof/body harness), you might want to strip-out the Purple/Light Green trace wire, which runs from the Light Grey connector junction in the LH footwell (C0102/C0484), all the way to the 8-way MQS door motor connector (C0831).

.

L90 BCM · Jan 7, 2014

PaulMc said:
The micro-switches in the door locks, switch the signal wire from the BCU to earth when a door is opened.

As Peter has said, the driver's door is on a separate circuit to the other doors, which are all in parallel, on the same circuit.

So, you can just leave the rear side and tail door harnesses disconnected and then, as far as the BCU knows, all the doors are present and closed.

As, there's no separate door harness for the tail door (its wiring is at the tail-end of the roof/body harness), you might want to strip-out the Purple/Light Green trace wire, which runs from the Light Grey connector junction in the LH footwell (C0102/C0484), all the way to the 8-way MQS door motor connector (C0831).

.

Does this mean I could just remove the connected and wires for all the doors bar the drivers and then wire the passenger door in parallel with the drivers door so it will unlock on one press of the fob and not two like normal

listerdiesel · Jan 7, 2014

L90 BCM said:
Does this mean I could just remove the connected and wires for all the doors bar the drivers and then wire the passenger door in parallel with the drivers door so it will unlock on one press of the fob and not two like normal

Possibly.

The double unlock is programmable in the BCU.

Peter

PaulMc · Jan 7, 2014

L90 BCM said:
Does this mean I could just remove the connected and wires for all the doors bar the drivers and then wire the passenger door in parallel with the drivers door so it will unlock on one press of the fob and not two like normal

No, don't connect the driver's and passenger doors together, they're wired to different terminals on the BCU, and perform different functions.

The 'driver's door open' function, does things like sound the 'lights on' warning, when the driver's door is opened (and the lights are on).

The 'other doors open' functions are separate to this.

'Single point entry' - which unlocks just the driver's door on the first press of the remote, can be turned-off in the BCU (using Nanocom, Hawkeye, etc...), so that all the doors unlock on the first press of the remote.

.

L90 BCM · Jan 7, 2014

Ohh that's good to know I can turn it off, so if I just use the original front pass and driver door connecters and discard the rest it should be ok

Don't think I will need that green with orange trace wire either as I will be using a rubber #### type aerial like a defender ( he says )

I have other issues with the fuel sender wires aswell

PaulMc · Jan 7, 2014

L90 BCM said:
Ohh that's good to know I can turn it off, so if I just use the original front pass and driver door connecters and discard the rest it should be ok

Yes, that will work

L90 BCM said:
Don't think I will need that green with orange trace wire either as I will be using a rubber #### type aerial like a defender ( he says )

That Light Green/Orange wire is powered via the 'auxiliary circuits relay' on 1.5mm² cable, through the same 15A fuse as the head unit's ignition-switched supply (F16 in the interior fuse box), so could be useful for something.

L90 BCM said:
I have other issues with the fuel sender wires aswell

What issues ?

.

TD5 wiring. Help !!!

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