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MY 2012 XF S Portfolio Ultimate Black
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Symptoms:
Failing boot lid loom is a known issue and many have already replaced that to solve one on below issues:
  • car won’t lock because thinks the boot lid is left open.
  • boot lid latch doesn’t work.
  • boot lid latch engages when lid is open.
  • rear view camera doesn’t work.
  • fog lights doesn’t work.
  • boot lid switch doesn’t work.
  • number plate lamps doesn’t work or behave abnormally.

The worst one is that car thinks the boot is open and you cannot lock the car specially over night or when you are in hurry. A quick solution is using key blade but you that alarm won’t set.

Why it happens:
reason for the failure is that the rubber/silicon insulation will crack. They are firm and age. If you don’t use the boot lid that often, they become dry and when you open the lid they crack and break. if you are lucky and they don’t touch one another, the dry copper wire underneath will quickly break due to fatigue because it is more flexible than the insulation.

How to diagnose:
There is a great write up about how access the loom here:
Access the loom

You can replace the loom with a low quality spare that is the same as original one or repair it. You can replace the wires wih very high quality cables way cheaper than the new spare part. You can jump forward to check the loom and see if need replacement.

start disconnecting from the side that is inside the boot. This way you don’t need to disconnect the battery.

This loom is bidirectional and you can fit it both ways. However it’s better to fit it he same way it was installed from factory if you are going to repair it. The look has two female connectors at both ends and the connections are like to like. Pin 1 in one end is connected to pin 1 in other end and so on. This means you don’t have to buy new loom if you got several of them broken and you don’t know which one goes to which.
In this photo you see two connectors side by side and two connections as an example. Please note that not all holes are in use.
182700


using a multimeter with continuity test or any other method you can create, check see which wire is broken. If they are all connected (except for the holes that you cannot see a lead inside), then your problem should be somewhere else.
If you have
completely broken wires and you’ve lost the track of them, using a masking tape label each end. The using a multimeter test the connection from each broken end to the pin on connector. Number it and repeat this for the other end. You will end up to something like this:
182701


there are normally two spots that wires. Please check both spots. One is in the section that is covered but rubber hose. Second one is about 10cm down where loom enters boot.

You can also cut the look somewhere like 10-20cm away from connectors and replace all wires with a higher quality one.

I had 2 completely broken wires and 4 broken insulation. I cut the wire slightly behind the broken section and used a 2cm flexible wire and soldered it to both ends and put a 4mm heat shrink before starting soldering. Don’t use wire longer because you have to bend it t fit which causes more problem later. If you did you have to unwrap all the way up to connector and push the excess wire near connector that it won’t move.

for wires with good copper and broken insulation, you can carefully push the insulation without cutting the copper about 5mm solder the unbroken copper for extra strength. Then electric tape over it and use a piece of wire insulation just like an splint. This will prevent future breakage.

finally repeat continuity test between ends and pins on one connector before putting it back. Make sure the rubber hose sits perfectly on both body panel and boot lid.

Tools:
-Multimeter with ohmmeter or continuity test functionality. Cheap ones from the Bay or DIY stores will do.
  • 60w soldering iron recommenced but 40w will do as well.
  • soldering wire and flux or flux cored soldering wire. Flux is very important to assure quality of you repair.
  • 4~5mm heat shrink.
  • electrical tape. Preferably black.
  • masking tape for temporarily labelling
  • trim removal tools for easier removal of boot liners. A average size Philips screw driver for clips

It took me 1hr including soldering. Depending on your competency in DIY jobs and situation of the loom, repair can take between 45min to 2 hours.
 

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Nicely done Hamed.. that should greatly help anyone who was a little hesitant to take on the task.. (y)
 
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A common issue that needed a write up. Nice one, Hamed!
 
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🏴󠁧󠁢󠁳󠁣󠁴󠁿X260 R-Sport in Aurora Red
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Spot on Hamed, great write up
 
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