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REAR PARKING SENSOR FAULT
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daisydolittle
 


Member Since: 24 Jun 2008
Location: doncaster
Posts: 19

England 2005 Discovery 3 TDV6 HSE Auto Zambezi SilverDiscovery 3
REAR PARKING SENSOR FAULT

hi there everyone

Last week my rear parking sensors have started to fail. Its not the normal 'long beep' as if something is triggering the sensor. All was absolutly fine, then the otherday put it into reverse as normal, then a higher pitched 'beep' was heard (constant for about 5 seconds), then the PDC light on the dash started to flash ????

The front sensors work fine, it just does this when the rears are engaged. checked the sensors for muck and the conections everything seems ok.

It does not do it 100% of time but probably 90%
Does anyone have any ideas about this
  
Post #70642221st Oct 2010 11:35 am
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Trackman
 


Member Since: 16 Apr 2010
Location: Glasgow
Posts: 430

Scotland 2016 Discovery 4 3.0 SDV6 Landmark LE Auto Waitomo GreyDiscovery 4

Not had the problem but check there are no cracks in the plastic housing that might let water in.

One of them might have just died so get a new one and try in each location till fault goes or just change the lot - its just money Laughing

Ian.
  
Post #70923927th Oct 2010 9:43 pm
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RMB
 


Member Since: 20 Mar 2007
Location: Scotland
Posts: 260

Scotland 2014 Discovery 4 3.0 SDV6 Commercial XS Auto Santorini BlackDiscovery 4

Hi daisydolittle

Afraid I had this.

Fix was - rear bumper removal & new wiring loom Big Cry

Upside though - the radio has never worked better. Thumbs Up

Rab
 B-A-S Remap Interface giving me control over my remap  
Post #70928828th Oct 2010 7:12 am
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D3Chris
 


Member Since: 24 Aug 2010
Location: Staffordshire / Cheshire border
Posts: 72

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Bonatti GreyDiscovery 3

I'll second that, had intermittent rear sensor fault myself, bumper off, new loom fitted, problem sorted. Took about an hour to do myself and I'm no expert! Think loom was about £24 from the stealers! Do a search on forum for bumper removal, found some quite good instructions on here somewhere.
  
Post #70929228th Oct 2010 7:30 am
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iandeb66
 


Member Since: 15 Sep 2009
Location: Dudley
Posts: 104

England 2005 Discovery 3 TDV6 HSE Auto Java BlackDiscovery 3

For about a week now i've had the same problem as daisydolittle except it goes into fault 100% of the time when i select reverse. How do we establish if it's a faulty sensor or faulty wiring loom? I'm assuming i need to to purchase one sensor and try each position to see if the fault disappears, the only problem is if more than one sensor is faulty. Do i need to have a dealer diagnose the fault?

Ian
 Java black D3 HSE 2004 - Gone
Blue D3 SE 2005 - Gone 
 
Post #70942628th Oct 2010 2:08 pm
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Disco_Mikey
 


Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20713

Scotland 2005 Discovery 3 TDV6 HSE Auto Cairns BlueDiscovery 3

iandeb66 wrote:
For about a week now i've had the same problem as daisydolittle except it goes into fault 100% of the time when i select reverse. How do we establish if it's a faulty sensor or faulty wiring loom? I'm assuming i need to to purchase one sensor and try each position to see if the fault disappears, the only problem is if more than one sensor is faulty. Do i need to have a dealer diagnose the fault?

Ian


Get down on your knees and see if you can here the sensors 'click'

Identify which ones dont click.

Remove the bumper and check wiring to silent sensors. Not a big job, only takes 30-45 mins

If wiring appears OK, swap the dead sensor with a known working one. If it starts working, you need a new sensor.
If it still doesnt work, you have a wiring issue

Just to note that if all 4 sensors are not clicking, check the fuse firstly.
If OK, it could be a broken feed or earth wire, as they all share a common feed and earth
And finally, PDC wont work if the handbrake is on. Car needs to be left in reverse gear with the ignition on for them to be active

No need for diagnostics from a dealer etc

HTH Thumbs Up
Mike
 My D3 Build Thread

TDV8 Retrofit Build Thread 
 
Post #7131387th Nov 2010 9:15 am
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Rocket Mk2
 


Member Since: 07 Oct 2010
Location: Cambs
Posts: 55

2005 Discovery 3 TDV6 HSE Auto Buckingham BlueDiscovery 3

Disco_Mikey wrote:
iandeb66 wrote:
For about a week now i've had the same problem as daisydolittle except it goes into fault 100% of the time when i select reverse. How do we establish if it's a faulty sensor or faulty wiring loom? I'm assuming i need to to purchase one sensor and try each position to see if the fault disappears, the only problem is if more than one sensor is faulty. Do i need to have a dealer diagnose the fault?

Ian


Get down on your knees and see if you can here the sensors 'click'

Identify which ones dont click.

Remove the bumper and check wiring to silent sensors. Not a big job, only takes 30-45 mins

If wiring appears OK, swap the dead sensor with a known working one. If it starts working, you need a new sensor.
If it still doesnt work, you have a wiring issue

Just to note that if all 4 sensors are not clicking, check the fuse firstly.
If OK, it could be a broken feed or earth wire, as they all share a common feed and earth
And finally, PDC wont work if the handbrake is on. Car needs to be left in reverse gear with the ignition on for them to be active

No need for diagnostics from a dealer etc

HTH Thumbs Up
Mike


My D3 has developed the same fault with slight difference. Front PDC works ok until you select reverse. I then get the long beep and the PDC light starts flashing, but it also knocks out the front PDC. You have to swtich ignition on and off to reset fronts. As soon as you select reverse the cycle starts again.

So it seems as though my rear sensors are at fault. How exactly do you do the click test. Do you need engine running?

I have noticed that one of my rear sensors is pushed in 8mm as well...
  
Post #71927322nd Nov 2010 11:50 am
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Rocket Mk2
 


Member Since: 07 Oct 2010
Location: Cambs
Posts: 55

2005 Discovery 3 TDV6 HSE Auto Buckingham BlueDiscovery 3

anyone Big Cry
  
Post #72048024th Nov 2010 4:00 pm
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Andrew Hebron
 


Member Since: 16 Jan 2009
Location: Teddington
Posts: 501

England 2007 Discovery 3 TDV6 SE Manual Cairns BlueDiscovery 3

Rocket Mk2 wrote:
I have noticed that one of my rear sensors is pushed in 8mm as well...


I'd start by rectifying this
 Andrew  
Post #72049124th Nov 2010 4:17 pm
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wilsonmg
 


Member Since: 16 Apr 2008
Location: Wigan
Posts: 335

England 

I had the same problem... tried the following;

diags highlighted a faulty sensor... got it replaced.. problem persisted
tried a new control box..... problem persisted
tried a new wiring loom... problem still persisted
scratched my head for a while..problem still persisted

went back to basics and checked all the sensors again (triing the sensor individually on the spare wiring loom as I do not have the fancy diag equipment) to find the new sensor that was originally replaced was faulty Evil or Very Mad

got a further new sensor and problem was fixed Thumbs Up

plus point I can now remove bumper and refit in record time Wink

so my advice would be to buy a new sensor or two from TLO, then play swap out on the rear..

hope this helps

Mart Thumbs Up
 Still miss my D3 Sad  
Post #72052224th Nov 2010 5:04 pm
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Rocket Mk2
 


Member Since: 07 Oct 2010
Location: Cambs
Posts: 55

2005 Discovery 3 TDV6 HSE Auto Buckingham BlueDiscovery 3

wilsonmg wrote:
I had the same problem... tried the following;

diags highlighted a faulty sensor... got it replaced.. problem persisted
tried a new control box..... problem persisted
tried a new wiring loom... problem still persisted
scratched my head for a while..problem still persisted

went back to basics and checked all the sensors again (triing the sensor individually on the spare wiring loom as I do not have the fancy diag equipment) to find the new sensor that was originally replaced was faulty Evil or Very Mad

got a further new sensor and problem was fixed Thumbs Up

plus point I can now remove bumper and refit in record time Wink

so my advice would be to buy a new sensor or two from TLO, then play swap out on the rear..

hope this helps

Mart Thumbs Up


excellent thanks.

Whats the best guide to use for the rear bumper removal?
  
Post #72070724th Nov 2010 9:26 pm
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wilsonmg
 


Member Since: 16 Apr 2008
Location: Wigan
Posts: 335

England 

http://www.disco3.co.uk/gallery/albums/use...emoval.pdf


follow it its easy Smile
 Still miss my D3 Sad  
Post #72124626th Nov 2010 9:22 am
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Rocket Mk2
 


Member Since: 07 Oct 2010
Location: Cambs
Posts: 55

2005 Discovery 3 TDV6 HSE Auto Buckingham BlueDiscovery 3

Thanks again.

will get the sensors ordered.
  
Post #72127726th Nov 2010 11:02 am
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timallen12
 


Member Since: 16 Dec 2011
Location: Oxford
Posts: 3

England 2007 Discovery 3 TDV6 HSE Auto Santorini BlackDiscovery 3

Many thanks as always everyone.
  
Post #137213512th Nov 2014 12:04 pm
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Mister-T
 


Member Since: 13 Jul 2015
Location: Brussels countryside
Posts: 31

Belgium 2008 Discovery 3 TDV6 HSE Lux Auto Bonatti GreyDiscovery 3

Easy to fix!

But on mine the problem is a little different, the fault is only sometimes present, so I can't verify the sensors. It just happens on the bad moments, yee, I love my D3!

Maybe I'm gonna verify the contacts and the wiring for breaks of water.
  
Post #160150929th Jan 2016 8:45 pm
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