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Electrical issue head scratcher
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iliffer
 


Member Since: 20 Feb 2019
Location: Sudbury
Posts: 6

United Kingdom 2006 Discovery 3 TDV6 S Auto Bonatti GreyDiscovery 3
Electrical issue head scratcher

Hi all

can anyone help me with an issue i have with my disco 3, was driving home from work last friday when the drivers window decided to stop half way down and would not close either.
removed the door panel and the motor sounded like it was trying but nothing moving, resided myself that i would need a new motor and then job done.
However when i got in the disco the following morning i noticed that the side repeater on the drivers door was on???
also noticed that now none of the windows were working but when i pressed the window switches the side repeater got brighter, strange!!!
Whilst trying the front passenger window it started working and the side repeater went out, then after a few seconds the side repeater lit up again and the window stopped. this repeated on a cycle roughly every 30 seconds.
need help with this one if anyone can suggest anything as i am now not convinced that the drivers window motor is even the start of the problem.

cheers guys
  
Post #203040020th Feb 2019 1:13 pm
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Littlewill
 


Member Since: 14 Sep 2015
Location: Lincolnshire
Posts: 484

England 2015 Discovery 4 3.0 TDV6 HSE Auto Firenze RedDiscovery 4

The first place I would look is where the main door loom comes from the foot well into the door (open you door and between the top and bottom door hinge you will see a thick black rubber boot inside which are all the wires that control your door functions. I suggest checking here for split or trapped wires. Does the window work when the door is wide open? Is the repeater light brighter when its shut etc? These tests might help pin down a damaged wire in the door hinge.
  
Post #203041420th Feb 2019 1:56 pm
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iliffer
 


Member Since: 20 Feb 2019
Location: Sudbury
Posts: 6

United Kingdom 2006 Discovery 3 TDV6 S Auto Bonatti GreyDiscovery 3

Thanks for the reply

Tried giving it a wiggle with the door open last night as it was my first thought also and didn't seem to have any effect on the functions.

The confusing issue is that the functions change at 30 second intervals like the electrical system in the vehicle is looping doing a self test and resetting faults, then for a short period of time allowing the window to work momentarily.
I would have thought that if a wire was broken i would have a constant fault not an regular intermittent one that is actually on a continuous on/off cycle, (if that makes sense).

thanks
  
Post #203044720th Feb 2019 4:00 pm
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Vince
 


Member Since: 31 Aug 2014
Location: Bridgend
Posts: 257

Wales 2005 Discovery 3 TDV6 S Manual Tonga GreenDiscovery 3

I think that you should check the alternator
  
Post #203047420th Feb 2019 5:58 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10337

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

sounds a bit like a bad earth.

there are earth points to the side of the throttle pedal.

It doesn't explain why its started now though.

Maybe wires got caught in the window mech
  
Post #203049220th Feb 2019 7:01 pm
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M3DPO
 


Member Since: 22 Sep 2010
Location: Notts.
Posts: 8044

England 2014 Discovery 4 3.0 SDV6 HSE Lux Auto Corris GreyDiscovery 4

It’s typical of a poor earth connection, take the door cards off and check all the plugs and sockets.

Edit: Great minds think alike Thumbs Up
 It can when others can't,
It will when others won't,
It goes where others don't. 
 
Post #203049420th Feb 2019 7:04 pm
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iliffer
 


Member Since: 20 Feb 2019
Location: Sudbury
Posts: 6

United Kingdom 2006 Discovery 3 TDV6 S Auto Bonatti GreyDiscovery 3

I thought bad earth might be a problem so i previously removed the door card and checked the wiring but couldn't see anything wrong, removed all the plugs in the door for windows, mirrors, courtesy light at the bottom, speaker etc and with everything unplugged it was still cycling every 30 seconds ish.
Plugged everything back in one at a time but no change.
couldn't see ant trapped wires and when giving the loom a good wiggle cant see any changes to the fault.

Did notice this morning on the way to work as it was dark that when the side repeater is on the window switch illumination is off and then they come on when the side repeater goes back off, also the electric mirrors don't work when the side repeater is on but do when its cycles off after 30 seconds.

Its the whole cycling thing that's confusing me like i previously posted.

Just to be clear the side repeater is coming on by itself its not when i am indicating and with the car stationary and running it toggles on for 30 seconds and then off for 30 seconds.

Thanks for all the help so far Thumbs Up
  
Post #203059721st Feb 2019 6:16 am
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M3DPO
 


Member Since: 22 Sep 2010
Location: Notts.
Posts: 8044

England 2014 Discovery 4 3.0 SDV6 HSE Lux Auto Corris GreyDiscovery 4

Have you had a Iid tool connected? - it will tell you if you have a faulty module or an open circuit due to a broken wire.
The electric windows can also be reset with the Iid, I don’t know if that would be any help though in your case.
 It can when others can't,
It will when others won't,
It goes where others don't. 
 
Post #203063221st Feb 2019 8:33 am
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10337

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

as I said, it probably earthed inside the car, by the throttle pedal. (behind the trim)
  
Post #203069921st Feb 2019 12:04 pm
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iliffer
 


Member Since: 20 Feb 2019
Location: Sudbury
Posts: 6

United Kingdom 2006 Discovery 3 TDV6 S Auto Bonatti GreyDiscovery 3

Hi

Haven't got an Iid tool but i'm waiting to get hold of one from a friend.

Regarding the earthing in the footwell, i will have a look this afternoon.

Cheers

Thumbs Up
  
Post #203070321st Feb 2019 12:17 pm
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iliffer
 


Member Since: 20 Feb 2019
Location: Sudbury
Posts: 6

United Kingdom 2006 Discovery 3 TDV6 S Auto Bonatti GreyDiscovery 3

Have had a look at the fault again this afternoon and checked for damaged wires and bad earth as suggested and all looks ok.
I have videoed what happens and loaded it onto YouTube with the link below (if I’m allowed to post a link to YouTube that is)
Seems to be that when you unplug the electric mirrors on that door that it will stop the side repeater coming on untill one of the electric window buttons are pressed.
It will also allow the passenger window to go up and down while the drivers Mirror is in plugged.

  
Post #203084121st Feb 2019 6:11 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10337

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

I don't know what test equipment you have, or your knowledge.


But a simple test is to find a wire that should be earth in the door (black wire on window motor comes to mind) and temp. run a wire to a known good earth in the car. (power socket surround. )

If everything starts working correctly, we know its a bad earth.

You would then want to connect this earth wire up on the door pillar connector and see if things work or not. That will help prove if the problem is inside the door or in the car.

It's then a matter of following thick black wires, until you see something obvious or ur not so obvious

Be careful, you don't want to short things out doing this. you could put a 20A fuse in line with your wire if you have one
  
Post #203084721st Feb 2019 6:24 pm
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M3DPO
 


Member Since: 22 Sep 2010
Location: Notts.
Posts: 8044

England 2014 Discovery 4 3.0 SDV6 HSE Lux Auto Corris GreyDiscovery 4

Out of curiosity check the side repeater for a constant live feed, ISTR reading that is how they work or don’t work until they are earthed, don’t know what it will prove at this stage. Do you have dip on reverse or folding mirrors on the S model?
 It can when others can't,
It will when others won't,
It goes where others don't. 
 
Post #203108322nd Feb 2019 3:44 pm
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gearmuncher
 


Member Since: 30 Oct 2018
Location: Woodley
Posts: 143

United Kingdom 2006 Discovery 3 TDV6 SE Manual Buckingham BlueDiscovery 3

sounds like the body control ECU has got it's nickers in a twist, have you tried a hard reset http://www.disco3.co.uk/wiki/Hard_Reset
  
Post #203109722nd Feb 2019 4:49 pm
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iliffer
 


Member Since: 20 Feb 2019
Location: Sudbury
Posts: 6

United Kingdom 2006 Discovery 3 TDV6 S Auto Bonatti GreyDiscovery 3

Hi All

I will at some point this week try checking the side repeater for a constant live feed but as yet have not had chance due to work commitments.

Had a look at the procedure for the ECU hard reset as suggested and seems like it might be the way to go if nothing found with the side repeater check.

cheers
  
Post #203204126th Feb 2019 10:06 am
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