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Parking Distance Control not working...

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Having seen a thread on here, I checked my parking sensors when the vehicle was in reverse, I can hear the clicking noise from each of the 4 sensors (which leads me to believe the sensors are all working as they should be), but I get no audible warning in the cabin. I'm pretty new to BMW's in general, only had my 320d Touring for 3 weeks so far, so could anyone suggest where I should check next? I'm guessing there may be an issue with the sound side of it, as the user manual states "System malfunctions will be indicated by a continuous high-pitched tone when the system is activated the first time", and I have no feedback whatsoever to inform me whether the system is working or not.

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Its is possible that the speaker for the system is faulty or disconnected. It can be found under the dash on the R/H side. Unless you have access to a proper OBD code reader then your only option is part swapping for a diagnosis.

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Awesome, thanks for that, I shall have a gander and see if I can find it to start with, if it's disconnected then ace, if not, I may know a man with a spare I could try. :)

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So I swapped out the speaker unit (or "gong" as it was advertised), to no avail. Anyone got any other suggestions before I go searching for any dodgy wiring? Are any of the bits in the near side cubby hole in the boot related to the PDC?

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Hi there, I have a similar problem ....although when I put it in reverse I get a couple of beeps then a solid beep. I have disconnected the speaker until I get round to sorting it out (better weather!). The clicking is no real indication that the sensors are OK.  I plugged the car into INPA and you can see all sensors individually working then one goes full on....so I know which one is faulty. 

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I don't even have a beep when I select reverse though, absolutely nothing. It's not bothering me too much, as I just make use of my mirrors instead of relying on the sensors, but it'd be nice to have it working. ;)

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Sensors clicking doesn't mean working. But not clicking however does mean not working.

INPA will do a live test and this showed one of mine to be faulty although it still clicked. Changed out the bad one and all was good.

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