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Tailgate Wires Broken! Rear lock, reverse lights, handle not working. Soldering advice/comments please!

Sj7

New member
Location
New Zealand
Hello Peoples -

The electrics on my MK5 have been wonky for a while as far as the rear hatch/tailgate is concerned. Wiper stopped working a few years ago. Now the tailgate won't unlock! Found some vids on youtube showing how other people have fixed this but I'm looking for some tips. I've got 7 wires to solder. The three bigger ones are easy enough to match up: Thick brown to thick brown. Thick white to thick white. Med white to med white.

But what about the 4 little guys? Too small to solder? How do I match them up? I've got a decent voltmeter and have worked on guitar amps but diagnosing German Auto electric is a whole different world! What I really, really, really want to avoid is shorting anything out and making a relatively simple repair into one beyond my ken.

Any advise would be greatly appreciated. Please see photo.

S

PS - This is the rear left wiring loom that moves when the tailgate is opened or closed. This is a relatively common problem and for some reason never occurs on the right side.
 

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GTI's

Drag Race Newbie
Location
MD
With that mess in that location I would get a new harness. If you want to make repairs I would not make them in the hinge point in the rubber boot but splice repair wires at the hatch interior & body side interior so that you would not have any repairs made inside the rubber boot. I have no idea why VW decided to use single color wires in that area. You will need to find a wiring diagram and trace them from the plug Pin location at the C-pillar to the plug Pin locations at the modules or lights.

 

Sj7

New member
Location
New Zealand
With that mess in that location I would get a new harness. If you want to make repairs I would not make them in the hinge point in the rubber boot but splice repair wires at the hatch interior & body side interior so that you would not have any repairs made inside the rubber boot. I have no idea why VW decided to use single color wires in that area. You will need to find a wiring diagram and trace them from the plug Pin location at the C-pillar to the plug Pin locations at the modules or lights.
Thanks for the reply, I appreciate it. I managed to find an incredibly detailed guide on how to replace the entire harness. Total time about 2 hrs, and with luck a long term solution. Seems some people solder or splice in place only to have to redo down the road when wires start breaking again. Rather do it once and do it right. Apparently only takes a couple hours. Cost around $150 for OEM harness, so I'll go that route. In case any one is interested, here's the guide: https://www.mk5golfgti.co.uk/forum/index.php?topic=86689.0
 

GTI's

Drag Race Newbie
Location
MD
Yes it is better to replace the harness for the hatch or the door and not spline in the flex area of the boot. I know they make a repair harness for the doors with the connector plug and long pigtails($25) so you can make the splices inside the door frame. Someone needs to do the same for the hatch at a reasonable cost.
 
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