1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.
  2. Welcome To LandyZone!

    LandyZone is the biggest Land Rover forum on the net. We have plenty of very knowledgable members so if you have any questions about your Land Rover or just want to connect with other Landy owners, you're in the right place.

    Registering is free and easy just click here, we hope to see you on the forums soon!

P38 RF Receiver to BECM

Discussion in 'Range Rover' started by dubloman, Oct 31, 2018.

< Previous Thread | Next Thread >
  1. dubloman

    dubloman Member

    Joined:
    Jul 21, 2015
    Posts:
    20
    Likes Received:
    2
    Location:
    UK
    Hi

    I am unsure if anyone has asked this question as I have spent most of the afternoon looking but cannot find what I need.

    The problem I have is this

    The RF receiver (green dot) seems to have failed. I know that it has the blue antenna wire and the three-wire plug (Purple, Black & Red/Orange) but I don't know where these wires go to on the BECM

    If I use a multi-meter on continuity and test the Blue and the black (I assume signal in and out) I get tone, I don't know what the other wires are for (I hope someone can tell me)

    If I use a blue dot the key will sync and work for a few days, then fail but then I am back to square one.

    I cannot find where the RF receiver will plug into the BECM so I cannot check the continuity of the wires between the RF receiver to the BECM as I feel that it is either a problem with the BECM or the wires between the two points, if you know what plug and colour the wires are at the BECM then that would be helpful.

    Does anyone know how to test the RF receiver off the car and how common is it for them to fail. If I have continuity between the Blue and black does this mean that the signal will come in and go out, is it also possible that the BECM is at fault or is it just the RF Receiver or is it the wires and how common is this fault

    If the RF receiver has failed who (if anyone does it) can repair the RF receiver as the green dots are 200 plus 2nd hand and the blue dots with all the problems are still 35 plus 2nd hand.

    I apologie if this subject has been done to death but the questions I have asked I cannot find the answers on this forum or on the Rave program or electrical version of the same and that is why I am asking this forum and all the knowledge that members have.

    Thanks in advance for all the info

    Dave
     
  2. Datatek

    Datatek Well-Known Member

    Joined:
    Feb 5, 2009
    Posts:
    29,983
    Likes Received:
    581
    Location:
    Near Poitiers SW France
    First step would be to check for wet under the carpet in the drivers footwell.
     
  3. Grrrrrr

    Grrrrrr Well-Known Member

    Joined:
    Jul 8, 2012
    Posts:
    9,434
    Likes Received:
    1,480
    Location:
    Buckinghamshire, UK. ('95 DT)
    Something like a Nanocom will tell you if the BECM received a valid code. If it doesn't then working out what failed will be a bit of detective work. Have you got RAVE? That has all the wiring diagrams so will tell you what power to expect where. @martyuk is a bit of an electrical whizz but not sure if he's around at the moment.
     
  4. Datatek

    Datatek Well-Known Member

    Joined:
    Feb 5, 2009
    Posts:
    29,983
    Likes Received:
    581
    Location:
    Near Poitiers SW France
    Unless you can delete the last valid code received before you operate the FOB, it will not confirm receipt of a valid code.
     
  5. Grrrrrr

    Grrrrrr Well-Known Member

    Joined:
    Jul 8, 2012
    Posts:
    9,434
    Likes Received:
    1,480
    Location:
    Buckinghamshire, UK. ('95 DT)
    Pretty sure you can clear the memory. Not had the Nanocom out in a while though.

    Didn't @tarphenry have a play with this recently?
     
  6. dubloman

    dubloman Member

    Joined:
    Jul 21, 2015
    Posts:
    20
    Likes Received:
    2
    Location:
    UK
    Hi

    Thanks for your replies as I do appreciate your swift replies.

    I do have RAVE but can you tell me what section and page the wiring diagram would be on (so I can check the plug and clean as needed)

    The vehicle did have water getting into the drivers footwell and after I sorted out the sponges on the valance (The car is new to me, only owned it a few months) It is now dry but might have had condensation on the plugs etc.

    I do have a BECM kit (ignition and door lock etc) so if I can get the alarm turned off I can change the BECM if that is the problem

    Thanks
     
  7. brianp38dse

    brianp38dse Well-Known Member

    Joined:
    May 13, 2014
    Posts:
    4,446
    Likes Received:
    1,481
    Location:
    heathrow
    The blue wire is just the aerial the black is the ground wire, purple is permanent live to RF receiver and the red orange is the signal wire to the Becm
    they are normally very reliable and don't give problems apart from picking up other signals and waking up the car and flattening the battery which is were the green dot ones came in
    you do not have to pay £200 + for one you can add an extra switch to stop rouge signals

    https://www.landyzone.co.uk/land-rover/rf-reciever-work-round.258096/
     
  8. Datatek

    Datatek Well-Known Member

    Joined:
    Feb 5, 2009
    Posts:
    29,983
    Likes Received:
    581
    Location:
    Near Poitiers SW France
    What is " a BECM kit"? You cannot just change the BECM as your FOB would no longer work unless you have a matching FOB with your replacement BECM, plus things like the mileage reading will go to the higher of either the speedo figure or the figure in the replacement BECM and things like the VIN number will be wrong also you would need diagnostics to sync the BECM to the engine ECU.
    If there has been water in the footwell, there may be condensation inside the BECM. You could disconnect the battery and remove and check ALL the connectors for corrosion and put the unit somewhere warm & dry like the airing cupboard for a few days to dry it out.
    Always run the airconditioning as it will keep the electronics dry.
     
  9. dubloman

    dubloman Member

    Joined:
    Jul 21, 2015
    Posts:
    20
    Likes Received:
    2
    Location:
    UK
    The kit contains the following
    BECM
    2 key fobs matched to the BECM
    Ignition switch
    Door Lock
    Instrument Binacle
    EKA code and chassis number & Reg of the donor vehicle.
    I hope that helps clear that up

    I have had lots of posts and lots more info on this subject and I thank everyone for their input.
    I still don't know and can not find the page on RAVE that says what plug controls the signal from the RF receiver so that would be useful please
    I can remove the BECM and dry it out as suggested (take the top off and apply gentle hot air) and clean all the plugs to try to rule out that element.
    The nanocom has been suggested, I assume it is the Nanocom Evolution and can this remove the fob memory as suggested and can it sync the becm to the ecu if I put the new becm into the vehicle.

    This is my next big question, I am in Preston Lancashire and have been on the spanners for many years and am a old school MOT tester, I became ill some years ago and all my tools were stolen, I am new to the nanocom devices but have used other plug in units years ago (yes they have become much more advanced) but the big question is this
    Is there anyone in my area who is prepared to lend me one of the units (I can leave the wife as a deposit....lol......Or if that's a problem cash as a deposit) but I could do with either buying one or asking someone to kindly lend me a unit if they will do all the jobs that I clearly need to do
    If it works for a short time then stops what would be the cause of an intermittant fault?

    Thanks again
    Dave
     
  10. Wazzajnr

    Wazzajnr Well-Known Member

    Joined:
    Apr 25, 2016
    Posts:
    1,329
    Likes Received:
    353
    Location:
    Chorley
    Dave, I'm in Coppull.
    If you can get down to my unit in Standish on Friday I can plug mine in and see what we can see. I make no promises mind.
    Is yours a thor or gems I only have the thor module for mine but it should still read most things just not engine
     
  11. dubloman

    dubloman Member

    Joined:
    Jul 21, 2015
    Posts:
    20
    Likes Received:
    2
    Location:
    UK
    Hi

    That's great news thanks
    I'm free on Friday afternoon and I can get to you.
    I believe it's the GEMS as it is the 1998 2.5 TD diesel M51 BMW engine but I am not sure to be honest
    I suppose plugging it in will tell us what issues my p38 has
    Thanks
    Dave
     
  12. brianp38dse

    brianp38dse Well-Known Member

    Joined:
    May 13, 2014
    Posts:
    4,446
    Likes Received:
    1,481
    Location:
    heathrow
    The gems and Thor are the v8 models gems early Thor late motor for the diesel it needs to be the Edc module to talk to the engine, but nanocom will still talk to the other systems.
     
  13. dubloman

    dubloman Member

    Joined:
    Jul 21, 2015
    Posts:
    20
    Likes Received:
    2
    Location:
    UK
    Thanks for the info
    I always say that if you learn something new each day you are better for it, the day you think you can't learn is the day you might as well pack everything in.
    As mine is the dse, I assume it is just known as the p38 DSE M51 then?
    Thanks
    Dave
     
  14. Wazzajnr

    Wazzajnr Well-Known Member

    Joined:
    Apr 25, 2016
    Posts:
    1,329
    Likes Received:
    353
    Location:
    Chorley
    Yep. Diesel. No problem, I don't have that module so as said above I won't be able to read the engine ecu but should be OK to read the others.
    It's an afternoon out and free tea or coffee
     
  15. Datatek

    Datatek Well-Known Member

    Joined:
    Feb 5, 2009
    Posts:
    29,983
    Likes Received:
    581
    Location:
    Near Poitiers SW France
    Personally, I would not even consider swapping out the BECM for what is most likely a minor problem, it should be a last resort. As I said, a dodgy drivers door lock/micro switches can cause exactly the problem you have, indeed I have just sorted the same problem on my project P38.
     
    Grrrrrr likes this.
  16. Grrrrrr

    Grrrrrr Well-Known Member

    Joined:
    Jul 8, 2012
    Posts:
    9,434
    Likes Received:
    1,480
    Location:
    Buckinghamshire, UK. ('95 DT)
    +1.

    There's a man near Preston that knows more about the P38 with the M51 engine that all of us put together. Now, what was his nickname? Hammer or something?
     
    Mark Piercy likes this.
  17. Datatek

    Datatek Well-Known Member

    Joined:
    Feb 5, 2009
    Posts:
    29,983
    Likes Received:
    581
    Location:
    Near Poitiers SW France
    But his mobility scooter won't go that far on one charge:rolleyes::D:D:D
     
    Mark Piercy and Grrrrrr like this.
  18. wammers

    wammers STILL BREATHING. Donater

    Joined:
    Oct 19, 2008
    Posts:
    50,929
    Likes Received:
    6,641
    Location:
    Preston Lancs.
    I'll have you know it has a 25 miles range. ;):p:D:D
     
    Mark Piercy likes this.
  19. wammers

    wammers STILL BREATHING. Donater

    Joined:
    Oct 19, 2008
    Posts:
    50,929
    Likes Received:
    6,641
    Location:
    Preston Lancs.
    Last edited: Nov 1, 2018
    Grrrrrr likes this.
  20. Grrrrrr

    Grrrrrr Well-Known Member

    Joined:
    Jul 8, 2012
    Posts:
    9,434
    Likes Received:
    1,480
    Location:
    Buckinghamshire, UK. ('95 DT)
    About the same as the v8 with 90 litres in it.
     
    brianp38dse and wammers like this.
< Previous Thread | Next Thread >