hi to all members and happy christmas /new year(new member)

weird one

I own a 2011 focus  zetec  petrol mark three

please help

every morning when drivers door is opened the speakers start popping around approx eight times (this is before radio is on)

and clears and anything is normal

thinking its was a faulty speaker ( so I changed all speakers and checked both wiring including cd player)(better quality)still the same

the only thing I think it could be is the cd player (possible a dry joint as car warms up it ok)i assume everything audio goes through cd player

my next problem is sourcing a replacement cd player (as ford want stupid money +breakers don.t always except returns)

my unit has DAB and voice command 

I have seen some for sale were the same engineering number except the last letters are different(and same radio spec)

and I am not sure if radio is coded or plug and play and if I will loose my rear parking sensor display on my MFD

or the sony unit is interchangeabe (wiring sockets and aerial connectors look the same)(see one from a focus Bmax)

sorry to go on just want it sorted before christmas

regards

mark c 

Obviously this is an old thread AND maybe i'm wrong but in case anybody else faces this issue, maybe this can help?

Quote

I will share with you a lesser known trick of
the trade as well. If you have a 9v battery
handy, (or similar) you can touch the speaker
leads to the battery to test polarity. Pay
attention to which wire is on the Pos + side
of the battery and which is on the Neg -
side. When you make the connection, if the
speaker or sub moves out, the polarity is
correct. If the sub sucks in, towards the
motor, the polarity is reversed. You can also
use this trick to figure out which wires are
running to which speakers b/c it will make a
small popping noise, hence "popping a
speaker". 

Could be that the polarity is around the wrong way?