M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8119
  
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Nothing at all, dead even with new switch.  It can when others can't,
It will when others won't,
It goes where others don't.
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 25th Apr 2024 6:09 am |
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gt40
Member Since: 21 Jul 2015
Location: Cape Town
Posts: 13
 
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I have a similar problem on a 2012 Range Rover Sport which is essentially the same car.
A friend was trying to code a new key fob without first ensuring that the vehicle battery was healthy and with no battery support unit/charger attached. Half way through, the voltage dropped enough to halt the process and now the ignition switch does nothing even with a new battery fitted. Certain electrical features still work as you have described with your car but the ignition wont come on and as a result the high speed can bus remains un-powered and one cant proceed with the necessary diagnostics because most of the modules are not recognised. There is no warning about key not found - the ignition switch simply doesn't work.
So far I have swapped the BCM, instrument cluster and ignition switch with no effect. My next plan is to change the KVM but I suspect the actual reason is one of the modules on the canbus is preventing communication. After the KVM swap I will test the canbus itself followed by disconnecting each module in turn until something positive happens. 2010 D4 TDV6
2010 D4 V8
2010 Range Rover TDV8
CAV GT40
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| 25th Apr 2024 6:39 am |
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M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8119
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Sorry to hear someone else has the same problem, only difference I wasn't able doing anything with the Iid tool. I am awaiting a reply from GAP to see if they have got a solution.
What is is KVM? It can when others can't,
It will when others won't,
It goes where others don't.
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| 25th Apr 2024 7:58 am |
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gt40
Member Since: 21 Jul 2015
Location: Cape Town
Posts: 13
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The KVM is the keyless vehicle module. 2010 D4 TDV6
2010 D4 V8
2010 Range Rover TDV8
CAV GT40
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| 25th Apr 2024 10:57 am |
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M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8119
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It still locks and unlocks so must be reading the key.  everything under the bonnet is dead! It can when others can't,
It will when others won't,
It goes where others don't.
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| 25th Apr 2024 8:28 pm |
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gt40
Member Since: 21 Jul 2015
Location: Cape Town
Posts: 13
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Success.
My troubleshooting pointed me towards the transfer box module on the high speed canbus. So I was planning on swapping it with a know good spare that I have and lo and behold I discovered the module was missing.
Bear in mind that this is a project car - bought as a non runner with a blown 5.0 engine and unknown history.
I fitted the module and the ignition came on normally. The transfer box module is the only module connected to the bus by the loop method so it makes sense that if it is faulty or missing, it will mess with the entire bus.
In my first post I explained how my friend was trying to code a new key when the fault occurred but I have no idea how he could have even started the key coding process with the fault being present - perhaps he didn't give me the full story...
This thread also relates to the OP's other thread
https://disco4.com/forum/topic207913-75.html 2010 D4 TDV6
2010 D4 V8
2010 Range Rover TDV8
CAV GT40
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| 28th Apr 2024 10:09 am |
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M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8119
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The problem is how do you test these modules without the engine being switched on?- it’s something the Iid tool will not do! I can’t even get it out of park to move it! I’ve had to use 3 jacks and two axel stands to get it off the ramps!
If this was caused by lack of fuel how would one go on if they were off road and it happened? It can when others can't,
It will when others won't,
It goes where others don't.
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| 28th Apr 2024 11:23 am |
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gt40
Member Since: 21 Jul 2015
Location: Cape Town
Posts: 13
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In my case the missing transfer case module disabled the high speed canbus which then would not allow the ignition to be turned on. As you say, its not possible to test the modules on the canbus using diagnostics due to no ignition so the only way is to disconnect each module in turn and see if the ignition can turn on after each is disconnected.
In your case the problem occurred after waxol treatment so I would check all modules that may have been affected by the areas where the treatment was done. I personally would check the park brake module first because that is under the car and most likely to be affected.
Was any treatment done in the engine compartment. I am not familiar with the treatment process because we dont suffer from much corrosion in Cape Town. 2010 D4 TDV6
2010 D4 V8
2010 Range Rover TDV8
CAV GT40
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| 28th Apr 2024 11:36 am |
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M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8119
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No treatment done under the bonnet, I have wax oiled my D3/D4 at least 5 times before without any issues.
Where about is the PB module located? It can when others can't,
It will when others won't,
It goes where others don't.
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| 28th Apr 2024 1:53 pm |
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gt40
Member Since: 21 Jul 2015
Location: Cape Town
Posts: 13
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It sits on top centre of the rear subframe - the module and actuator are in one unit. With the suspension in extended mode, you should be able to see it in the gloom. Follow the park brake cable from either wheel hub and they end at the module.
There is also a multi pin plug on top of the chassis which is accessible through the rear left wheel arch more or less in line with the centre of the wheel. You may have to feel for it under the fender liner. I have had a problem with that plug in the past although I cant remember what fault it was causing. That plug could definitely come into contact with any liquid sprayed up under the vehicle. 2010 D4 TDV6
2010 D4 V8
2010 Range Rover TDV8
CAV GT40
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| 28th Apr 2024 2:10 pm |
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jenseneverest
Member Since: 12 Jun 2017
Location: somewhere
Posts: 769
  
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Could you not just pull the fuse / relay for the EPB ?
(My D3 ran about for months with no handbrake - and would throw up all sorts of errors on the id tool but did still run.....)
There is a good thread here about the dreaded can bus system.
https://www.disco3.co.uk/forum/topic101021.html
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| 30th Apr 2024 3:11 am |
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M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8119
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I have tried that thanks, but that indicates the fault is NOT the park brake. and as the fuel tank senders are giving a positive reading at the rear NS connector it theoretically illuminates two items. I’ve checked the earth cable, even recharged the battery using the engine as earth, fitted new brake light and ignition switch, checked an double checked there is no waxoil on any cables, checked all fuses, what else can be stopping the ignition to come on?
I am still awaiting a reply from GAP, third email I’ve sent and still no reply, not the service they gave in their early days, you got a reply by return even on a Saturday evening. It can when others can't,
It will when others won't,
It goes where others don't.
Last edited by M3DPO on 30th Apr 2024 7:10 am. Edited 1 time in total
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| 30th Apr 2024 6:57 am |
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gt40
Member Since: 21 Jul 2015
Location: Cape Town
Posts: 13
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jenseneverest wrote:Could you not just pull the fuse / relay for the EPB ?
(My D3 ran about for months with no handbrake - and would throw up all sorts of errors on the id tool but did still run.....)
There is a good thread here about the dreaded can bus system.
https://www.disco3.co.uk/forum/topic101021.html
The canbus is not fused as such so pulling a fuse that removes power from a module wont necessarily affect the canbus or how it communicates.
Ideally one needs to disconnect any electrical connector from a module to isolate it completely from the bus.
But before doing all that you should test the canbus using a simple multimeter via the diagnostic plug. Its very quick and easy and will at least point one in the right direction. 2010 D4 TDV6
2010 D4 V8
2010 Range Rover TDV8
CAV GT40
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| 30th Apr 2024 7:07 am |
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M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8119
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Thanks not read it all yet but it looks very helpfull It can when others can't,
It will when others won't,
It goes where others don't.
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| 30th Apr 2024 7:14 am |
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gt40
Member Since: 21 Jul 2015
Location: Cape Town
Posts: 13
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https://www.google.com/search?client=firef...bd2+pinout
A lot of info out there. The numbering on the images one sees is what you will see when you look at the face of the diagnostic connector in your car. 2010 D4 TDV6
2010 D4 V8
2010 Range Rover TDV8
CAV GT40
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| 30th Apr 2024 7:19 am |
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