Need Help to identify AL4 cable in towing harness of foldable tow bar

Hello,

The towbar wiring harness instructions at a certain point tell you to connect the red wire (AL5) coming from one leg of the fuse to the RBCM module socket, pin 4T.

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Pin 4T in this module is connected either to the rear wiper motor or to ground.

I bought the harness used. It does not have the AL4 wire with the fuse.
AA – not used
AD – buzzer
AU – 15 A / 30 A supply
AL3 – trailer detection
AC – plug for the buzzer

My question is: what kind of wire is this, since theoretically it goes from the 13‑pin socket?

cable_unknown..webp

Is it possible that this is another ground wire?

I am attaching the entire manual for the towbar wiring harness just in case.

Thanks in advance for any answers that could point me in the right direction.
 
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