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Default GPS Antenna Problem - 28th January 2018, 11:35 AM

I have a 2002 Mini One with Sat Nav. I believe that the antenna is in the "shark fin" at the rear of the roof. When I remove the alarm sensor, I see two cables coming from the antenna fixing nut. One is a simple wire which disappears into the car loom and the other appears to be a co-ax cable which terminates in a co-ax plug. This plug is not connected to anything and there is nothing obvious into which it should plug. Can anybody help?
  
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Default 28th January 2018, 01:33 PM

Welcome to tM. This useful post from another forum covers the replacement in detail, hope this helps.

Replacing OEM antenna base - MINI Cooper Forum


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Default 28th January 2018, 01:45 PM

Many thanks for the link. My problem is that after removing the alarm sensor, there is a cable with a co-ax plug unconnected to anything. I did not remove it!! What I really need is confirmation that this connector is for the GPS which seems to have no antenna connected but has worked for many years, and if so, into what should it be plugged. I am assuming that it has become disconnected due to vibration or similar. Or maybe it has no function and I need to look elsewhere for the fault.
  
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Default 28th January 2018, 02:07 PM

Have a read of this after doing some further digging...

Help: antenna/antenna wire problems - MINI Cooper Forum

Having a sat installed the coaxial feeds into an antenna amplifier.


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Default 28th January 2018, 04:33 PM

Interesting. Thanks again. It seems that the antenna is OK. AM and FM reception is good. The wire from the sharks fin goes into a co-ax cable which presumably goes to the antenna splitter and amplifiers etc. There is some pretty clever radio engineering going on here as it would seem that AM, FM and Sat Nav all share the same antennas. I also have the antenna in the drivers side rear window. I'll take the seat out tomorrow and have a peek at the GPS unit. It just might be a connection problem there.
  
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Default 28th January 2018, 06:52 PM

Not sure if this helps, here’s a diagram of the wiring...



Hopefully it will turn out to be a connection issue.


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~ 25,000 miles report
~ 35,000 miles report
  
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Default 29th January 2018, 08:00 AM

The picture is indeed most useful. Thanks again.
  
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Default 29th January 2018, 02:52 PM

The MINIfans catalogue is very informative. I now see that the extra coax plug coming from the shark fin is for a mobile telephone (not fitted). It looks as though there might be an antenna amplifier but after removing the receiver from under the driver's seat it isn't obvious. The antenna cable just disappears off into the loom with the other cables. I know it is a long shot but has anybody got any idea where such an amplifier might be situated if fitted?
  
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Default 30th January 2018, 03:36 PM

Did you manage to find it? Could either be hidden in the panels next to the rear seat as shown in the diagram or in the rear hatch. The guide below covers the 2nd generation.

https://www.pelicanparts.com/techart...eplacement.htm


Current
2013/13 Mini Roadster 2.0 Cooper SD.
2016/16 Mini Countryman 2.0 Cooper SD All4.

Previous
2013/13 Mini Countryman 2.0 Cooper SD All4.

~ Our CM SD All4
~ 10,000 miles report
~ 20,000 miles report
~ 30,000 miles report
~ 40,000 miles report

2011/11 Mini Countryman 1.6 Cooper D 2WD.

~ 25,000 miles report
~ 35,000 miles report

Last edited by zf44; 31st January 2018 at 09:03 PM.
  
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Default 31st January 2018, 10:52 AM

Haven't found it just yet!! I'm waiting for a GPS antenna which will go directly to the unit and will hopefully give a signal although I am worried that as an active antenna the necessary voltage only comes from the antenna amplifier and not the GPS unit itself. Time will tell. I will take the rear hatch to pieces next and will keep you posted. Thanks again for the interest and help.
  
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