Thread: A Few Issues to Sort Out on my D2 TD5 - Need a Little Help

Originally Posted by TAHAIC

My Transfer case and centre diff have been overhauled and a CDL housing fitted Unfortunately there is no wiring for the CDL switch in the factory wiring harness M.R. say they have never seen that before - normally the wiring is in the factory loom. Dose anyone know what the deal is with that?

Looks like I will need to run a wire(s) not sure if I need to run up to under the gear selector (might be a plug under there) or all the way up to the dash - or exactly where to connect it. Any info would be appreciated.

IIRC the CDL switch might have one side earthed through fitting but not sure about that so first of all check that with multimeter, if you get earth one one terminal run a wire from the other terminal to C0681/0668 and splice into pin 7(black/blue wire) , if no terminal earthed connect one to earth, important is to get an earth to that connector when the CDL is locked

Originally Posted by TAHAIC

For those interested - I had my left hand horn button launch itself into the back seat the other day - I just ordered a horn button wiring assy part No QTN100270 genuine from Land Rover for $174.00 which is actually cheaper than whats available online. IMO if the button is worn then so to will be the base that it clips into so I went for a brand new assy.

This sums up what I hate and love about land rovers, while ****ing you off theymmake you laugh.

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Originally Posted by sierrafery

IIRC the CDL switch might have one side earthed through fitting but not sure about that so first of all check that with multimeter, if you get earth one one terminal run a wire from the other terminal to C0681/0668 and splice into pin 7(black/blue wire) , if no terminal earthed connect one to earth, important is to get an earth to that connector when the CDL is locked

Bang on Sierrafery. I pulled the console apart to gain access and tested it with a piece of wire and it lights the dash indicator and provides input to the ECU. System works as per earlier models, if CDL engaged before starting the engine the TC and ABS are disabled and if engaged after starting the engine TC and ABS are still on. In fact you don't even need to start the engine to test just turn ignition on (position II) since ECU only checks for the CDL input during boot process.

From what I have read there are some early 2003 models that don't have a CDL (or wiring for switch) but software has been changed to same as post face lift 2003 and 2004 models such that have a CDL but TC and ABS are on all the time regardless of whether the CDL is engaged or not when the engine is started.

I need the plug to plug into the switch for the CDL so I'm going to investigate the possibility of getting the console to gearbox wiring harness from a 2004 part No YMD111893. I'll also get a price on the 2004 High/Low/CDL lever and cable.

Found a pretty good tutorial on this which tells you what wire to cut/put switch in although I don't know why you would want to as Pedro pointed out.

www.discovery2.co.uk/Factory Diff Lock

Originally Posted by steve_a

This sums up what I hate and love about land rovers, while ****ing you off theymmake you laugh.

Sent from my SM-T530 using AULRO mobile app

Too True - I didn't know whether to be ****ed off or laugh.

Originally Posted by TAHAIC

From what I have read there are some early 2003 models that don't have a CDL (or wiring for switch) but software has been changed to same as post face lift 2003 and 2004 models such that have a CDL but TC and ABS are on all the time regardless of whether the CDL is engaged or not when the engine is started.

I need the plug to plug into the switch for the CDL so I'm going to investigate the possibility of getting the console to gearbox wiring harness from a 2004 part No YMD111893. I'll also get a price on the 2004 High/Low/CDL lever and cable.

Found a pretty good tutorial on this which tells you what wire to cut/put switch in although I don't know why you would want to as Pedro pointed out.

www.discovery2.co.uk/Factory Diff Lock

WABCO made that TC inhibition with a good reason, if you want to not be inhibited but to work together with the CDL you need a SRD500070 SLABS ECU which is addapted for that no loom or cutting wire needed only that input from the switch which you can fix with a piece of wire, it's a complicated discussion you can see the arguments here starting from post #9 https://www.landyzone.co.uk/land-rov.../#post-3636713 ... IMO the TC on the early modells where the warnings are coming on would not work together with the CDL in most cases but against it

Originally Posted by sierrafery

WABCO made that TC inhibition with a good reason, if you want to not be inhibited but to work together with the CDL you need a SRD500070 SLABS ECU which is addapted for that no loom or cutting wire needed only that input from the switch which you can fix with a piece of wire, it's a complicated discussion you can see the arguments here starting from post #9 https://www.landyzone.co.uk/land-rov.../#post-3636713 ... IMO the TC on the early modells where the warnings are coming on would not work together with the CDL in most cases but against it

mmm ... I was wondering about that. A SRD500070 might be in order.

What then would be the consequences of fitting front and rear lockers?

No consequences with axle lockers cos then the wheels on the same axle are spinning with the same speed so the TC will rest by default as the ECU will get similar inputs from the sensors if you see what i mean also that ECU is enhanced to not activate TC so easy and it has the brake overheat prevention in it....though if you want to fit axle lockers and CDL too no need for uprated SLABS ECU cos with all those locked the TC is useless and wouldn't kick in anyway

Dont bother with front and rear lockers.
A D2 with functioning TC and CDL locked is awesome and provides virtually all the benefits of lockers without the downsides in all but the most extreme circumstances.
IMO especially considering a D2 -front and rear lockers are for one of 3 reasons.
1/ No elecrtonic driver aids due to build vintage (not a D2 issue).
2/ Competition or extreme use.
3/ the most common: Too much money, too little understanding, reading too many magazines, lazy driving techniques and sounds cool to boast.

Find your CDL inputs and use your existing ECU.
I recall as your model was solely reliant on the SLABS ECU for traction, yours may have the later SLABS ECU with revised parameters, in which case great.
If not just cut the blue wire as per "The Good Oil"

There is absolutely no need to fit a later model SLABS ECU.
Tyre size, pressure, speed and driving technique have a greater effect than any of the enhancements found in the later SLABS ECU off road.

I just know ill upset someone saying this but...
Claims of noticeable CDL locked performance offroad are from those justifying to themselves the effort and expense of changing out to a later ECU.

The variations in the later SLABS ECU are essentially irrelevant to CDL locked genuine low range 4wd operation.
The later ECU does however do a better job in unlocked situations.