Context:
Wiring of a tow bar on a vehicle with a PDC Park Distance Control present. In my case it is a Fiat Fiorino MKIII (225 from 2021) with a Bosch PDC and a car specific wiring kit.

This applies to nearly all Fiat. Goal is to automatically deactivate the PDC when reversing with a trailer on the hook.

Problem:
How to locate the pin 6 and what is the catch to open the socket?

Solution:
Every socket designer seems to try to invent a new and highly creative way to hide the locking mechanism. Once you have got the catch it is easy and fun.

To identify the pin number 6, which is responsible to digest the reverse signal from the car, please refer to the following picture.
zz_SocketPinNo.jpg

Hardly to read you can see the markings for 1 and 5. Thus the number 6 is the pin I marked to be so.

Hint: If you are an old myopic fart like me, use your smartphone, take a photo and zoom in and you can easily read it!

To unlock the pins, please refer to the following picture:
zz_SocketNose.jpg

I did scribble in red to call your attention to two tiny noses, which hold the socket inlay in place. I restrain myself from explaining the still hidden locking mechansim inside the inlet keeping the pins in place. Once it is open you will understand without words how it works.

At the position beneath the noses, indicated by the two horizontal red arrows, stick in a device, such as a very fine screw driver. A hair pin or the like will do equally well. It is just to disengage the noses.

Then insert a somewhat more solid screwdriver at the position indicated by the green arrow on the bottom of the socket between the outer socket and the inlay.

Et voilà, the inlet will move out in direction of the top red arrow.

Sorry if this is a boring commonplace to you, me, I did literally loose hours to google (in vain) and mess around with the device.


HTH,
BlackForest

Attention: Take a photo of the cables before you start messing with the device, just in case they slip out of the inlet. Then you will be happy to have this photo handy!