Electric seats not working

Jaykay1987 · Nov 30, 2021

Hi all,
Ive retro fitted some full leather electric seats into my 03 disco...I was lucky, i had the brown plug under the seat, to just plug straight in...I have the control switches all plugged in as it should be and used nano to turn the function on in the BCU...BUT...
Still no joy.

Ive checked with multi meter & im not getting any power at the brown plug coming from the car...So im gathering as its never had the need for the plug to be live prior, It has no fuse in...other than the fuses under the seats (all ok), where is the fuse & or the relay that feeds the brown plug from the car located?

Stanleysteamer · Nov 30, 2021

Google and ye shall find!
https://www.google.com/search?q=whe...me..69i57.17545j0j15&sourceid=chrome&ie=UTF-8

Jaykay1987 · Dec 1, 2021

trust me, ive googled for hours! I have already checked FL5 in the engine bay, which shares the front windows, its fine & windows work fine...but the brown plug under the seat, is still dead with no live feed...starting to pull my hair out!

Stanleysteamer said:
Google and ye shall find!
https://www.google.com/search?q=whe...me..69i57.17545j0j15&sourceid=chrome&ie=UTF-8

Stanleysteamer · Dec 1, 2021

Jaykay1987 said:
trust me, ive googled for hours! I have already checked FL5 in the engine bay, which shares the front windows, its fine & windows work fine...but the brown plug under the seat, is still dead with no live feed...starting to pull my hair out!

Have you tested at the switches?
Looks like you are stuck with either electronix like telling the BCU you want it to "enable" summat. Don't ask me when it comes to electronix, I am stood in the foothills of that mountain.
Or it is a simple wiring fault, which will mean a bit of laborious testing with probes and a multimeter.
Don't know if it would be dangerous to do this, but could you supply the circuits with voltage from a separate supply to see if you can get them to work?
Short answer, ask @sierrafery he seems to get all this stuff.

Stanleysteamer · Dec 1, 2021

Jaykay1987 said:
trust me, ive googled for hours! I have already checked FL5 in the engine bay, which shares the front windows, its fine & windows work fine...but the brown plug under the seat, is still dead with no live feed...starting to pull my hair out!

Sorry, although my links answered the question you asked, I forgot you have a nanocom and have already enabled the seats, so that part of my last post was a waste of time.
The rest still stands though.
Old skool, checking for current, earth, voltage, dodgy or missing connections.
Best of luck!

sierrafery · Dec 1, 2021

Jaykay1987 said:
I have the control switches all plugged in as it should be and used nano to turn the function on in the BCU...BUT...
.... where is the fuse & or the relay that feeds the brown plug from the car located?

Hi, first of all the BCU has nothing to do with the heating elements only wih the eletric seat functions, you must get direct feed to both switches green/white wire from F15 interior fusebox then with switches closed the power should get into the brown plugs pin 1, the LED on the switch comes on when you push it?

Stanleysteamer · Dec 1, 2021

sierrafery said:
Hi, first of all the BCU has nothing to do with the heating elements only wih the eletric seat functions, you must get direct feed to both switches green/white wire from F15 interior fusebox then with switches closed the power should get into the brown plugs pin 1, the LED on the switch comes on when you push it?

Knew you'd be on it, Mate!

backinblack · Dec 1, 2021

According to Rave the BCU applies an earth to make the circuit so IMO power should be at the seat.

Jaykay1987 · Dec 1, 2021

sierrafery said:
Hi, first of all the BCU has nothing to do with the heating elements only wih the eletric seat functions, you must get direct feed to both switches green/white wire from F15 interior fusebox then with switches closed the power should get into the brown plugs pin 1, the LED on the switch comes on when you push it?

Thanks for reply...yeah the heated seat light comes on when pushed in...its the electric seats that dont work...i have enabled the seats in the bcu, but tested the brown plug and there is no power to the seats coming from the car itself

sierrafery · Dec 1, 2021

Sorry, i misunderstood that it's only about heating. Did you measure against earth in the brown plug pin 5 or across terminals? the feed for that is hardwired from FL5 so if you have voltage in the fusebox cavity and not in the brown plug pin 5 the wiring is interrupted but if it was manual it's possible that the wire is missing...do you have wire in pin 5 which connects to the brown/purple wires of the seat side?

Jaykay1987 · Dec 1, 2021

sierrafery said:
Sorry, i misunderstood that it's only about heating. Did you measure against earth in the brown plug pin 5 or across terminals? the feed for that is hardwired from FL5 so if you have voltage in the fusebox cavity and not in the brown plug pin 5 the wiring is interrupted but if it was manual it's possible that the wire is missing...do you have wire in pin 5 which connects to the brown/purple wires of the seat side?

the fl5 has a 50amp fuse in, i never bothered to see if it has power, as the electric windows share it & they work.

I checked continuity in the 2 wires in the brown plug and there's no continuity. also checked continuity in the black wire in the brown plug to the body, and the earth is good...just no power coming down the live side

sierrafery · Dec 2, 2021

Jaykay1987 said:
I checked continuity in the 2 wires in the brown plug and there's no continuity.

I dont see any relevance of that, you'll have to get handy and lift the fusebox to check for voltage against body in C0576 pins 4, 5 cos from there the power goes directly to the brown plug, if no power at the fusebox you'll have to change it but if you get power there better route new wires to the brown plug

Jaykay1987 · Dec 2, 2021

sierrafery said:
I dont see any relevance of that, you'll have to get handy and lift the fusebox to check for voltage against body in C0576 pins 4, 5 cos from there the power goes directly to the brown plug, if no power at the fusebox you'll have to change it but if you get power there better route new wires to the brown plug

sorry, misunderstanding ...ill get on it the weekend and pull the fusebox out and have a look...if i have no luck, ill probably just hardwire them myself & use an inline fuse...thanks mate, always pull me out the **** you do

Jaykay1987 · Dec 4, 2021

my brown plug from the car only has 2 wires, for the heated seat element to work (which does), it doesnt have the 4 wires to be plug & play...I have another discovery that has the 4 wires & can be plug & play.

if you unlucky like me, it needs hardwiring, for anyone needing to know how...And all will work.

black - earth
orange/purple - earth
brown/purple - 12v power
orange/white - 12v power to heated element

thanks everyone for the pointers

Stanleysteamer · Dec 4, 2021

Jaykay1987 said:
my brown plug from the car only has 2 wires, for the heated seat element to work (which does), it doesnt have the 4 wires to be plug & play...I have another discovery that has the 4 wires & can be plug & play.

if you unlucky like me, it needs hardwiring, for anyone needing to know how...And all will work.

black - earth
orange/purple - earth
brown/purple - power
orange/white - power to heated element

thanks everyone for the pointers

Thanks for this.
So to help thickos like me, does the motor change direction when you switch from one earth to the other or what?
And would you use a switch like a two way window switch or what?
Pardon me for being so hard of knowing about electrics.

Jaykay1987 · Dec 6, 2021

Stanleysteamer said:
Thanks for this.
So to help thickos like me, does the motor change direction when you switch from one earth to the other or what?
And would you use a switch like a two way window switch or what?
Pardon me for being so hard of knowing about electrics.

No...well, yes...that is how the motors actually work, just reverse the poles for direction of the motor.

But you still need the control switches, to plug into the seat to control them...that wiring instruction, is just how to get power to actual brown plug on the bottom of the seat.

Stanleysteamer · Dec 6, 2021

Jaykay1987 said:
No...well, yes...that is how the motors actually work, just reverse the poles for direction of the motor.

But you still need the control switches, to plug into the seat to control them...that wiring instruction, is just how to get power to actual brown plug on the bottom of the seat.

I seem to remember that for the electric windows, the switching of the polarity happened at the BCU or somewhere. So perhaps he needs to find this stuff too. Sort of thing that at first sight seems simple, but obvs isn't.

Jaykay1987 · Dec 6, 2021

Stanleysteamer said:
I seem to remember that for the electric windows, the switching of the polarity happened at the BCU or somewhere. So perhaps he needs to find this stuff too. Sort of thing that at first sight seems simple, but obvs isn't.

nows ive done it, its not too bad lol...what ive learned from this, if you check your brown plug under your seats and it has 4 wires, you can plug your seats in plug & play...If the brown plug only has 2 wires, its for heated element only & will need hardwiring in...which is easy enough.

Jaykay1987 · Dec 6, 2021

Electric seats not working

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