'10 Cayenne GTS, the trailer's right turn signal light does not work.

The P!g's turn signal's work fine (left trailer too).
Does not matter if it's incandescent or LED, no trailer (right) blinker. Tried with 1 trailer of each, same result. Tried my personal trailer (incandescent lights), same results (no right turn signal at trailer, works fine on '06).
No indication of blinker at pigtail/Pollak plug using 12v tester.
Checked fuses 1, 3 & 5 on right dash fusebox, fuses good.
U-Haul is a stickler about this, wouldn't let me rent a trailer because all lights don't work. Used a LED 7 to 4 adapter, works fine on my '06 but right turn doesn't work on the '10.
Porsche factory trailer hitch and wiring.

I would like to know where this particular trailer wiring harness goes and it's part number (if it's replaceable).

TIA

 

Bill, sorry to hear and I can't help you. FYI - I have never been able to make the LED U-Haul trailers work with my '10 GTS. I tried all of the relevant adapters and then just gave up. My issues were with the brake lights.

 

On my '06 in order to work w/ the U-Haul LED I bought an 7 to 5 adapter for the Audi/Porsche/MB's (has resisters built into the adapter), cut the 5th pin off with a Dremil but it still wouldn't work. I next removed the center pin on the round section of the 7 to 5 adapter plug and it works fine now.

I'll let you know when I get the '10 working (hopefully).

Like I said in the OP, it's doing the same thing on my landscape trailer which has incandescent bulbs so I don't think this is a LED issue.

 

Frank, did you know about the Voluntary Workshop Campaign for certain '09 & '10 Cayenne's to reprogram the Trailer Hitch Control Unit? Service 30/10 ENU WA27 dated May 7, 2010. Apparently the trailer hitch control unit goes into power save mode. Don't know if it will solve either of our problems but I'm going to give it a try.

** Just read further, looks like on the '10's only the Transsyberia's are affected, '09's a bunch more models are affected.

I did order a couple of parts from Curt Hitch (Amazon) that supposedly allow the P!g to work with the LED lights, I'm going to give it a try.

 

OK, got the problem fixed and also got the U-haul LED lights to work with the '10 GTS.

A PO had installed a adapter that looked much like the Curt Adapter except this one had a 4 way flat connector spliced into it to. I removed that adapter and installed the std that I had previously installed on my '06 Cayenne. At this point the std incandescent lights on my landscape trailer now work. I also got the LED lights on a U-Haul trailer to work too but I'll put that detail in another thread.