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Using the existing GSM antenna

I've got a 2015 Nissan Leaf and I've been contemplating installing the OVMS module. The car was initially a lease in the US and brought to Canada once the lease was up, so there are issues getting the native Nissan Connect app working (i.e. registering the VIN). I've heard that the app isn't spotty at best anyway, which is when I stumbled upon OVMS.

This afternoon I removed the glovebox and was wondering if anybody had tried using the existing GSM antenna that is plugged into the TCU. If not, I might have a look around to see if I can make an adapter cable unless there is some other gating issue.

Been doing a bit more

Been doing a bit more research and it looks like the existing antenna uses the Hirose GT16 series. The female housing is the GT16C-1S-HU while the male housing looks like GT16C-1PP-HU. I might buy a couple of the male ends and the crimps to see if I can make the cable myself. 

I have created the cable,

I have created the cable, pics here. I have not tested the cable yet, that'll have to wait until my OVMS module has arrived.

This is the bill of materials:
1x GT16C-/1.6-2.9PC (outer contact crimp, male)
1x GT16-2428PCF (inner contact crimp, male)
1x GT16-PC (insulator)
1x GT16C-1PP-HU (male housing)
1x GT16C-1P/S-R(23) (housing retainer)
1x 135100-01-24.00 (RG316 coaxial cable)

The instructions for crimping the cable can be found on page 55 of the GT16 series datasheet

I used a Molex 0638111000 crimper for the inner and outer crimps:
1.4 mm setting for inner conductor
3.2 mm setting for ground portion of outer conductor
3.4 mm setting for insulation portion of outer conductor


very interesting idea

It works!

Well I received my OVMS module today, so I was finally able to test out my cable assembly and it works! I've connected to a local network and can read information off of the car remotely.

Is this something anyone else would be interested in? I might talk to a cable vendor and see what it'd cost to get a few made up.

Thanks for sharing the BOM

Thanks for sharing the BOM and photos, I'd be interested in a cable but I suspect there's not many more (since a new GSM antenna is around US$4, and I probably have decent local contacts to do for me what you have done.

Thanks all the same.


So can I replace the sim card that came originally in the vehicle and connected the module to the car's antenna? 

If it's possible it'll be awesome since my module's "network card" is broken and currently I'm using a portable router inside my car to keep it connected !!

Antenna replacement

This is only an alternative for the antenna that connects to the module. The OVMS modem module is required for this to work.

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