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Parking Sensors - System fragile
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Lenny1974
 


Member Since: 10 May 2020
Location: Bristol
Posts: 70

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Buckingham BlueDiscovery 3
Parking Sensors - System fragile

Are all parking sensors/looms so sensitive to water ingress/electrical gremlins etc ???

So, parking sensors wouldnt work initially with the usual flashing orange light and beeping.

Bought myself a diagnsotic checker and identified the faulty sensors and replaced them.

All working perfect for a month

Now, (And I am thinking after it has been washed) it is showing that both front and rear power circuit (fault codes B1B57/ B1B58) is this another bumpers off and check all the sensors again ?

I have checked the loom connections for the front and rear and looks dry (behind both light clusters)

Dont understand why both circuits are 'faulty' and what is actually triggering it.  
Post #216431729th Jul 2020 11:59 am
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Disco_Mikey
 


Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20726

Scotland 2005 Discovery 3 TDV6 HSE Auto Cairns BlueDiscovery 3

Front + rear power circuit fault is a sensor that has short circuited

Need to replace them individually to track down the faulty one Thumbs Up My D3 Build Thread

TDV8 Retrofit Build Thread  
Post #216432029th Jul 2020 12:17 pm
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Lenny1974
 


Member Since: 10 May 2020
Location: Bristol
Posts: 70

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Buckingham BlueDiscovery 3

Cheers Mikey, I was hoping you wouldnt say that.

I'll start on the easier access ones first Big Cry  
Post #216434029th Jul 2020 2:12 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10359

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

The easiest thing is to remove the rhd drivers headlight, unplug the front park loom. Red yellow blue green black brown wiring.

Clear codes. Put in gear and park brake off

If that code comes back the fault is a rear sensors.

Obviously you will get codes for the 4 front sensors being disconnected

Do you have a DMM resistance reader ? If yes, see here:

https://www.disco3.co.uk/forum/parking-sensor-issue-189586.html  
Post #216437629th Jul 2020 7:31 pm
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Lenny1974
 


Member Since: 10 May 2020
Location: Bristol
Posts: 70

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Buckingham BlueDiscovery 3

So I disconnected the front parking sensor loom and cleared the codes.

I then just got all x4 front sensors coming up with an error code.

So from that I deduce the problem is with the front loom and/or one of the sensors.

I then removed the outer font right, cleared codes and run the check again.

I then got outer front right sensor code error (Which lead me to belive it was this sensor).

So I swapped it with a different sensor, reset codes and got the power circuit error again.

This then made me believe the issue is with the loom wiring to the outer front sensor ?

I only had a lunchtime to take off bumper and check, so didnt get as long as I wanted to investigate, nor I am any kind of electrical buff.

I might get some more time at the weekend and get my hands on my multimeter, so happy for any more advice.

Cheers  
Post #21660466th Aug 2020 1:32 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10359

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

The trick to remember is :

If you unplug something (and clear the codes and probably select a gear with P brake off),
and the both front and rear power circuit code goes away you have unplugged the faulty component.

Obviously if you unplug a sensor, it will report it as faulty, as its not there. The important point is whether the short power circuit fault codes have gone or not (after a clear)

If the power short code hasn't gone (after a code clear), the faulty item is still plugged into the car.  
Post #21660566th Aug 2020 2:00 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10359

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

So yes it does appear to be a problem at the front.

It could be that front side one you removed.
When you fitted a replacement, was it a new replacement ?  
Post #21660586th Aug 2020 2:05 pm
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Lenny1974
 


Member Since: 10 May 2020
Location: Bristol
Posts: 70

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Buckingham BlueDiscovery 3

No, I only had the ones fitted to the car, so I just swapped them over.

I recently did all this last month and replaced all the faulty sensors as I had the usually flashing orange light and beep. Thought that was it and very happy.

I have a spare back in bristol, so when I go back I will swap it over with what I think is the faulty sensor and check the codes again.

Should just be a case of swapping, clearing codes and checking.

Its such a pain in the Censored removing the front bumper, partial wheel arch by yourself all the time......  
Post #21660696th Aug 2020 2:20 pm
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