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Electric seats, 300tdi- have searched

Discussion in 'Land Rover Discovery' started by toadfish, Sep 5, 2020.

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  1. toadfish

    toadfish Member

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    1996 ES 300tdi
    So, having found info on here about switches I dismantled and cleaned.
    No joy.
    Driver seat only moves with door open. Clue or designed that way?
    But up/down simply produces 'clicking noise' underneath seat now. (The seat did lower a second ago)
    Tilt and fore and aft work ok.
    Passenger side no worky with door open.

    She used to leak like a sieve.

    ECU have some corrosion or dry solders?

    Oh yes rear near side window not always operate straight away; not sure if it starts as voltage has built up or something somewhere has dried out. I use th AC year through to keep pipes lubricated and car dry and have sealed most water ingress points?

    Any help?

    I am stuck in middle of nowhere with no books or RAVE

    CHEERS.
     
  2. toadfish

    toadfish Member

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    Have disconnected motor that drives up and down part. With the two cables disconnected the motor spins ONE way. With cables connected motor does not spin.
    Lack of volts?
    Busted motor?
    Now trying to get to wires to get motor out and on a bench.
     
  3. toadfish

    toadfish Member

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    I think it is the motor.
    I have taken it out and apart. Cleaned brushes and spins better.
    Will fit and post a fix or not plus some photos if I can.
     
  4. sierrafery

    sierrafery Well-Known Member

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    toadfish likes this.
  5. toadfish

    toadfish Member

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    Motor raises seat now. Implies it was dirty brushes?
    No dropping off seat. Will test voltage to motor another time.
    Photos attached.[​IMG] or maybe not.
    Motor [​IMG]
     
  6. mystery

    mystery Well-Known Member

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    Discovery 1 MY97 - Electrical 239.png
     
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  7. toadfish

    toadfish Member

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  8. lynall

    lynall Well-Known Member

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    I had a 300 and a td5 disco both had elec seats, the tdi especially was always having issues with the seat switches, at least once very few months it was strip/clean/lube reassemeble, the main thing I remember is chasing the bloody ball bearings all over the shop!
     
  9. toadfish

    toadfish Member

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    Yes, but this is not a switch issue as they have been cleaned and electricity is getting to motors (on RHS). LHS is a different matter.
    Why the rear window only goes down sometimes... plus the seat electrics... plus the amount of rainwater that used to get inside...

    Led me to think ECU could be damp (because I read on here that can happen).
    Cheers
     
  10. discool

    discool Well-Known Member

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    As u have two issues why not deal with one at at a time?
    There’s no ECU involved with the electric seat adjustment, the rear windows do have an ECU controlling them and I believed that the PCB can suffer with a ‘dry joint‘ or two, there’s a lot already stated in Forums on the repair, issues with the windows lowering can be also mechanical as well as electrical.
     
  11. toadfish

    toadfish Member

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    Thanks for confirming my recollection of ECU linked to windows.
    Thanks for letting me know ECU has nothing to do with seats.
    I am not trying to fix window; fixed every one before (even made new 'bushes' for glass to sissor mechanism and every door catch before, so going to have a break there.
    Only trying to fix seat and it has taken me a year to get around to that as I don't get a lot of free time. Lucky no one else drives.
    Cheers
     
  12. discool

    discool Well-Known Member

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    The switch operation was notorious for failing in the early RRs, there was a mod with replacing the switches with a home made four rocker switch bank arrangement.
    I suppose it how often u use the discos switches is if the fail or not i have even much on the Forum about them.
    I’ve set my seats at full height and all the way back and that’s how they stay, the only time it’s altered was a while ago by the shorty mot tester, he’s now gone so now their never moved.
    Same with sunroofs and window switches are never touched unless their opened to clean around the edges, sunroofs that’s once a year and windows now and again :)

    p.s It’s only the drivers seat that moves with the drivers door open, plus of course both seats as normal with the ignition switch in position 1 or 2.
     
  13. toadfish

    toadfish Member

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    Thanks again.

    Just checked; driver's seat only moves with door open not with door closed and key in position 1 or 2.

    Not sure if that is normal.

    Like you I have hardly ever moved seats in fact only found this out when I went to recline the seat for a nap
     
  14. sierrafery

    sierrafery Well-Known Member

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    You could have avoided all this dillema by reading the owner's handbook :cool:
    D1 electric seat operation.jpg
     
  15. toadfish

    toadfish Member

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    My seats do not do as the handbook or your image state.

    The seat only moves with door open.
     
  16. sierrafery

    sierrafery Well-Known Member

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    Then maybe that diode is shot
     
  17. discool

    discool Well-Known Member

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    Correct it doesn’t tell the whole story... that’s the reason I didn’t post a copy earlier in #10, but just stated the correct operation of the seats.
    Away Houston we have a problem... the drivers seat should move with ignition switch in position 1 or 2 and with the drivers door door closed.
     
    Last edited: Sep 8, 2020
  18. sierrafery

    sierrafery Well-Known Member

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    OK, forget about the diode, i checked the whole diagram and the MFU is involved too. So when the door is open and ignition off the earth to the driver seat power relay's coil is delivered by the MFU to S2102, when the ignition is switched on the MFU cuts the earth path and then the earth should come through the closed door switch... according to the diagram and the function mode if the seat doesnt move with ignition on and door closed the problem is with the door switch or it's earth point cos earth doesnt get to the relay's coil from there and that's the same for the window lift ECU earth too
     
  19. toadfish

    toadfish Member

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    Many thanks.
    Brilliant.
    When I get home with more tools I will delve in.
    Cheers
     
  20. discool

    discool Well-Known Member

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    So when the door is open and ignition off or with the key iin position 1 or 2 aswell the earth to the driver seat power relay's coil is delivered by the the door switch in a closed position, therefore the seat will move as required.
    With the door closed the switch its open therefore the earth return has been removed. But, the earth return will be provided in key position 1 or 2 via the left seat power relay contact, energised by from the ignition switch sipply at fuse #6.

    Theres no interferance with the Multi Function Unit via the drivers door switch other than:
    (1) It allows the windows to be controled after the ignition is turned off from position 2 to postion 0, then the MFU allows 45 seconds or thereabouts for window adjustment, as long a the drivers door isn't opened. (That may or not also apply to electric operated sunroofs... which I haven't confirmed)
    (2) A link to the security ECU for various security system functions.
     
    Last edited: Sep 9, 2020
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