land rover td5 v reg will not start or crank, key fob not working either

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tigorocks

Member
Posts
32
Location
kendal
hi when it rains it stops my fob opening my td5 land rover discovery v reg central locking then will not start or crank think immobilisor is still on, but when its sunny after a few hot days the fob works and the jeep starts
how can i fix this?
obviously getting wet somewhere. but how can i either fix it or overide it so it starts without using central locking
thanks
 
Last edited:
Cant help with a permanent fix, but acting as if you are fitting a new fob battery should get it going.
1 remove battery
2 press fob buttons to drain any charge
3 refit battery
4 press lock button a few times to resync (indicators will flash when it's done)

Maybe a new battery is what it wants?

Edit: just realised this is disco forum not defender so I don't know if the fobs/process are the same
 
First thing, replace the battery in the fob. It's a CR2032. Use one of good qualtiy, not a "ten for a quid" special in the local pound shop.
Next, check the mounting bolt which secures the RF receiver to the bodywork is clean, corrosion free and tight. The receiver is just in front of the rear sunroof.
While you're checking that bolt, it might be a good idea to remove the receiver and check it for moisture damage, it is a fairly common fault.
Lastly, get rid of the jeep (Gawd wash my mouth out with soap and water) and keep the Discovery.
@neilly has done a good write-up on Disco 2 alarm issues which you'll find here:-

https://www.landyzone.co.uk/land-rover/handy-buying-alarm-info.311291/
 
Cant help with a permanent fix, but acting as if you are fitting a new fob battery should get it going.
1 remove battery
2 press fob buttons to drain any charge
3 refit battery
4 press lock button a few times to resync (indicators will flash when it's done)

Maybe a new battery is what it wants?

Edit: just realised this is disco forum not defender so I don't know if the fobs/process are the same

thanks for your help.. battery is new so its not that, and when its bone dry sunny for a solid week the key starts working again. will try your key process tomorrow tho thanks
 
First thing, replace the battery in the fob. It's a CR2032. Use one of good qualtiy, not a "ten for a quid" special in the local pound shop.
Next, check the mounting bolt which secures the RF receiver to the bodywork is clean, corrosion free and tight. The receiver is just in front of the rear sunroof.
While you're checking that bolt, it might be a good idea to remove the receiver and check it for moisture damage, it is a fairly common fault.
Lastly, get rid of the jeep (Gawd wash my mouth out with soap and water) and keep the Discovery.
@neilly has done a good write-up on Disco 2 alarm issues which you'll find here:-

https://www.landyzone.co.uk/land-rover/handy-buying-alarm-info.311291/

hi brian 47
thanks for reply.
right i tgook out the reciever in front of sunroof had it in my house near radiator for 2 days didnt do nothing when refitted.
the key fob worked fine then when rained it wouldnt uinlock the doors on the discovery, but when it went sunny again the keys worked fine again so do u think i stil need to change the battery in key fob?
thanks
 
hi brian 47
thanks for reply.
right i tgook out the reciever in front of sunroof had it in my house near radiator for 2 days didnt do nothing when refitted.
the key fob worked fine then when rained it wouldnt uinlock the doors on the discovery, but when it went sunny again the keys worked fine again so do u think i stil need to change the battery in key fob?
thanks
I always advise changing the battery first off since it provides a known place to start. Does the little red LED on the fob light up every time you press one of the buttons?
When you had the receiver on a radiator, did you open the unit up to examine the internal PCB? If so was there any evidence of moisture damage, either a "wetness" on some of the components or a sort of greenish crusty looking corrosion?
Is there any evidence of dampness anywhere in the vehicle such as in the driver's or passenger's footwells?
 
I always advise changing the battery first off since it provides a known place to start. Does the little red LED on the fob light up every time you press one of the buttons?
When you had the receiver on a radiator, did you open the unit up to examine the internal PCB? If so was there any evidence of moisture damage, either a "wetness" on some of the components or a sort of greenish crusty looking corrosion?
Is there any evidence of dampness anywhere in the vehicle such as in the driver's or passenger's footwells?

yes i have 2 keys one with a light on fob one without but the light works on key
yes i took out the green plastic thing! with the reciever on it out of the black plastric casing. its looks like its been wet the silver bit on the reciever is dark grey on the top silver on the side but it looks pretty clean
]no damp i dont think in foorwells but under the roof lining its wet damp
 
sorry mate cant see find that rev 5 pdf link sorry im useless on computers
The two attached files are at the bottom of the first message posted by neilly. Click on the square just to the left where there would normally be a picture and then you should get asked what you want to do with the file; you want to open it. I presume that you're using a PC, not a phone or something else.
 
The two attached files are at the bottom of the first message posted by neilly. Click on the square just to the left where there would normally be a picture and then you should get asked what you want to do with the file; you want to open it. I presume that you're using a PC, not a phone or something else.
i will ahve a look now cheers
 
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