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PDC / loom failure
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rovlecky
 


Member Since: 07 Aug 2012
Location: Aberdeenshire
Posts: 131

Scotland 2006 Discovery 3 TDV6 SE Manual Cairns BlueDiscovery 3
PDC / loom failure

Read through masses of threads on the subject I have fault codes
B1B57 Front sensors power circuit - General electrical failure - circuit short to ground
B1B58 Rear sensors power circuit - General electrical failure - circuit short to ground
Isolated both looms from the PDC ECU faults persist. Question is in order to elemiminate the loom that runs from the PDC. where does it go to? Is therea known point at which it might fail??thanks for any advice guess it looks like the PDC ECU
Thanks
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Post #169867931st Aug 2016 6:50 pm
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Disco_Mikey
 


Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 17324

Scotland 2005 Discovery 3 TDV6 HSE Auto Cairns BlueDiscovery 3

You have a faulty sensor, shorting internally.

Unplugging the looms does not isolate the sensor, you need to disconnect each sensor in turn until the S/C fault disappears Thumbs Up
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Post #169868331st Aug 2016 6:52 pm
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rovlecky
 


Member Since: 07 Aug 2012
Location: Aberdeenshire
Posts: 131

Scotland 2006 Discovery 3 TDV6 SE Manual Cairns BlueDiscovery 3

Thanks Mike. Thumbs Up assumed if the looms were disconnected then they were isolated, Embarassed had the rear bumper off recently as well ... Least I know what to do this time
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Post #169869631st Aug 2016 7:11 pm
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Bucky776
 


Member Since: 28 Jan 2019
Location: County Down
Posts: 2

United Kingdom 

I have the same problem.
I suspected my issue was different to the normal parking sensor failure as my system gave a long error sound as soon as I turned the car on. In the past when it failed, it only gave the long error sound when I selected reverse.
Having replaced the pdc module in the rear, removing the rear bumper to check the wiring, replacing the rear sensors (with one new one- one at a time) the problem persists.

I have had it plugged into a diagnostic reader and the errors are B1B57 and B1B58.

I’m looking for advice on where to go next. I have heard of some people turning off the front sensors on CCF to determine if fault is in rear or front. How exactly is this done?
  
Post #202304628th Jan 2019 11:40 am
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 4035

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

To select only reverse sensors, this is done with a GAP IID (£405) (in CCF settings)

However, remove the drivers headiight, unplug the colourful park sensor plug.
Clear the fault codes
Select Reverse

It will now complain about 4 front sensors missing (and maybe front open circuit), but the key question is, has the short failure gone? If yes, its one of the front sensors or front loom. >>>

purchase a new sensor,
remove front bumper
unplug all sensors.
reconnect loom by headlight
reconnect 1 sensor at a time.
select reverse
and see if short circuit comes back. (you maybe able to tell by the error tone) REPEAT (connect next sensor). when it does, you found the faulty sensor. replace.
Otherwise the loom could have chaffed on front bumper metal work
  
Post #202305828th Jan 2019 12:19 pm
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