So finally we have it sorted. Adam at AT Autoworks in Hatcheston, Suffolk collected my TD4 from my place two days ago on Monday morning and left me a car on the drive if needed. Adam phoned about mid afternoon that day and told me he'd found a dry joint on one of the supplies to the cabin fuse...

Thanks, noted and added into the 'wetware' database currently under construction :)

Thanks again and will do. Could it be that the replacement CCU wasn't getting a synch'd key signal to send on to the ECU and alarm module? Do you think that I'll need to - a) Get my current keys synch'd with whatever properly working CCU gets fitted in the end? or b) Do I just get a...

Thanks again, I've written a fuller update below but just wanted to say here that your presumption seems correct as after fitting the replacement CCU (00030) the engine ignition wouldn't work either so I refitted the old CCU (00031) which in turn enabled me to get back to a driveable vehicle...

Fitted all the bolts and made no difference when turning the key, symptoms presenting same as my original post. I'm not sure whether I have read in this forum or someone told me recently but it now seems that my original keys have a little transmitter inside them that communicates with the...

Thanks very much.

Thanks for this, all good to know. I'm currently having what I think are CCU related issues with my 2001 TD4 5 door and people are trying to help there already on a separate thread. I replaced the CCU but things immediately got worse and couldn't even start the car and drive it. Currently...

Only just started to work on it again and heavy rain has arrived. I've attached an image of the original CCU showing part numbers etc, it shows as being YWC000031 would that be an issue if the replacement I fitted is YWC000030 ? I'll take the replacement out later and check the numbers on that...

Thanks for this, is there a way that I'm able to confirm if I'm an 'early' or not ?

Thanks

Thanks very much, will try tomorrow morning if it's not pouring with rain. Hopefully it's just the ground needed, fingers crossed then.

Thanks for this, the Rave list agrees with the Haynes one by the look of it and good to know how the immobilisation System works, appreciated. I also need to check with LR online or a reputable site to confirm the correct CCU part number that I need to use if I find the replacement isn't...

That suggests to me then that the key wouldn't need to 'recognised' by the CCU and should not be causing the electrical mayhem that ensued after I did the CCU swap. Could it simply be the bolts need to go in to provide the required earth and/or is it that I've put the two small CCU wiring plugs...

Good to know, thanks. How much would reprogramming cost ? Sorry if this sounds daft as I'm far from being an electrician but much much better with plumbing and heating. Do you think putting the three fusebox mounting plate bolts back in will provide a required earth to the plugged-in CCU (and...