GL x164 towbar electrics

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My 2011 GL is fitted with a factory fitted swing away towbar and 13 pin electrics.

The first time I tried to tow a trailer all that would work in terms of lights were the brake lights. All other lights were dead with warning lights on the dash confirming such.

No trailer bulbs are LED.

Tried the car with another trailer - same result, both trailers lights work with other cars perfectly.

Checked fuses in rear SAM, all ok.

It has been plugged into a STAR machine and only faults found were that trailer lights mentioned above had short.

Does anyone have any idea what might be wrong, or what else to check?

Many thanks
 
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Wiring commonly breaks within the outer sheath where it flexes everytime you swing the towbar away. I’ve repaired dozens on different models of Mercedes with the swing away towbars. Worth checking that first.
 

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