Andy Warren · Jul 12, 2023

Hi all, a friend has an issue with his MY2014 D4, every time he selects reverse the audible warning sounds even when there's nothing behind the vehicle (so he has to switch it off every time which he says is now becoming a PITA).
Can anyone tell if this is more likely to be a sensor problem the wiring to it or the parking module itself (or all three if he's unlucky

).
Would someone be kind enough to let me have the resistance readings for the sensors please & I will start there. Thank you in advance, all the best.

Firebobby1 · Jul 12, 2023

If he/she or it select's reverse, then listen closely to each sensor, you should hear clicking from working ones.
I had a dud on my BMW and I was getting the constant beeeeeep.

gstuart · Jul 13, 2023

Plus 1 , with regards to handbrake off , selecting reverse with the ign on should hear them clicking , best to choke the wheels if on a slope

another issue can be if there’s a tow bar fitted , some can cause issues

best to get a code reader on there as that will also help

as it’s before 2016 something like a basic Autel AP200 in white are very good in reading codes and live data as indeed with these vehicles being so complicated a code reader is really a must

also found a link to that code reader

Amazon product

hope that also helps

lynall · Jul 13, 2023

Code reader should tell you which sensor is duff

Andy Warren · Jul 13, 2023

gstuart said:
Plus 1 , with regards to handbrake off , selecting reverse with the ign on should hear them clicking , best to choke the wheels if on a slope

another issue can be if there’s a tow bar fitted , some can cause issues

best to get a code reader on there as that will also help

as it’s before 2016 something like a basic Autel AP200 in white are very good in reading codes and live data as indeed with these vehicles being so complicated a code reader is really a must

also found a link to that code reader

Amazon product

hope that also helps

Many thanks for that, I doubt he'll fork out for a reader as he knows absolutely nothing about mechanical/electrical stuff on vehicles even though I've told him he'll get his money back twice over (if a garage was fixing the problem).
I have my Foxwell NT530 I can plug in & see if that shows anything but I'll stick me lug hole to each of the sensors first off & listen for said clicking. Thanks again & I'll let you know how I get on, all the best.

gstuart · Jul 13, 2023

Andy Warren said:
Many thanks for that, I doubt he'll fork out for a reader as he knows absolutely nothing about mechanical/electrical stuff on vehicles even though I've told him he'll get his money back twice over (if a garage was fixing the problem).
I have my Foxwell NT530 I can plug in & see if that shows anything but I'll stick me lug hole to each of the sensors first off & listen for said clicking. Thanks again & I'll let you know how I get on, all the best.

ur so welcome

indeed as we all know thry pay for themselves very quickly , particularly with the amount of electronics in a D4

very handy u have a Scanner , indeed an easy way to test by listening to them

hopefully it’s just one of the sensors and not the loom , if I remember rightly it’s normally the off side rear that fails but at least u can confirm that for him, plse also ensure they’ve not been accidentally turned off which can happen if a tow bar has been fitted

indeed, plse let us know how u get on

Andy Warren

Well-Known Member

Firebobby1

Well-Known Member

gstuart

D3 Grandad

lynall

Well-Known Member

Andy Warren

Well-Known Member

gstuart

D3 Grandad

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