Hi everyone,
I would like to change my original LR tow bar electronics from 7 pin to 13 pin!
Do I need to change the ECU? Which parts do I need?
If possible I’d like to keep it original!

2004 4.4 V8

Thank you

you asked the same question in May 2021 and had loads of info... ... - .- -.




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I know but only parts for L322 newer than 2006 were posted! Still did not find the proper parts and nonody vould tell me if I can keep my existing ECU or if I need a mew one!
LRcat couldn’t help either

ok..if you do a forum search theres loads of info on this.....(thats how i found your previous thread) ... - .- -.




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workshop manual downloads are in our wiki

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I can’t think of any reason you would need to change the trailer socket ecu, serving one new 13 pin socket is no different to serving the two existing 7 pin sockets. The ecu is still doing the same job.
I’m not sure what you need in the way of advice but if l was doing it l would cut the existing cables just behind each existing socket, hopefully having made a note of what conductor was connected to which pin in each of the sockets.
Then pull the two existing cables through into the boot back to a position you can position a waterproof electrical joint box. Don’t buy a small joint box, you will need a bit of room to joint the various cables.
It’s then simply a case of running a 13 core cable from your joint box to your new 13 pin socket.
Personally l would connect the 13 core cable to the new 13 pin socket and then mount it to the car first.
It’s then a case of connecting your new cable conductors to the two existing cable conductors by your chosen method.
I would recommend soldering each joint the then covering each joint with heat shrink sleeving.
Provided you have been careful, your new 13 pin socket should now work.

This may be of help

Or, just use a twin (7 pin) socket to single (13 pin) adaptor lead. No need for the potential of b*gg&r^ng things up. Previous cars:
S-Max 2007-2013 (only diesel I've had, good car but expensive when diesely bits go wrong, so what's the point?)
Galaxy 2001-2007
Mondeo Estate 1997-2001
Sierra Estate 1993-1997
Uno Turbo 1987 -1993
Fiesta 1984 - 1987
Fiat 127 1982 - 1984

I would leave as is & if you need to tow trailers with 13-pin plugs then use an adaptor.

Also, bear in mind 13-pin sockets are MOT test items whereas 7-pin are not.

Yes you can just rewire the 2 7 pin sockets to a 13 pin. The functions are the same, its just a different plug.
I did it to mine as my caravan and are trailer are 13 pin. And you can use a converter for 13 pin to 7 pin if need.

I didn't use any junction boxes, just cut the wires right at the back of the existing plugs

I used this plug, as the back accepts 2 cables, so it made the job fairly easy.

It is a bit fiddle to do.

Had to modify the plate the socket bolts on to, just filed the hole a little bigger

https://www.ebay.co.uk/itm/224986598900?ha...SwwpdW11nk

James 2011 Range Rover Autobiography TDV8 Buckingham Blue