KSellers

I have a 2011 CTT. When I put a 7pin to 4 pin adapter into the Pollak Trailer light plug I instantly get errors. Check left trailer light, Check trailer brake light, Start/stop mode deactivated. I'm using a Hopkins adapter, and even tried purchasing a new one. Same errors so I know it's not the adapter. Any ideas on where to start

chsu74

I have the same problem also with LED lights wired. Also, I bought the LED adaptor plug with still the same issue.

All if the lights work except getting signal lights to flash.

Subscribed.

cwheeler

Something to check, have you driven through some rain as of late? Or even this year? My turn side plug, holds water. Was having a ton of light errors I couldn't figure out. Pulled the plug from the truck, then pulled the connecter from the back and it was full of water. Dumped, cleaned, packed with some bearing grease and reconnected everything. No errors since.


Cw

F SANE IL

1. clean pollack connector with electric cleaner.

2. If your 7pin to 4pin connector has an LED on it, you will always have this problem. Exchange it for a regular connector that has no lights on it

3. Trailer has led lights. Change to regular if possible.

cwheeler

1) yes,
2) not true. I run a lighted connector no problem.
3) not true. I run a trailer full of LEDs. No problem.

F SANE IL

Happened to me, which is why I said 2 and 3

GrandPaJohn

My trailer has all LED and no issues. 2016 CD. I thought I read somewhere that LED lights were an issue with earlier Cayennes?

patriot993

Bump on thread

I had OEM trailer hitch installed last week but the Pollack connector had gotten lost so a new one was ordered and installed yesterday. Tech ran a diagnostic after the install and got two errors as shown in this picture:



These errors happened before any trailer had ever been connected to the Cayenne. We decided to see what happened when I got home and hooked up the trailer.

Well, got home last night, hooked up trailer, and got the error on the dash "Check left trailer brake light".

I am in the process of swapping out all of the incandescent lighting to LED; right now there are not any incandescent lights attached; I have clipped all of the wires and capped them off (waiting for replacement LEDs). Fender lights and brake/reverse/turn signal are new LED and those are installed.

Cayenne is 2011 with May 2010 build

******UPDATE*******
I talked to one of the service advisors at the indy garage that I use - he thinks it may be as simple as the 7 pin pollack adapter being bad versus the Porsche wiring itself - I will be testing that today/tomorrow


thanks!

Kenrevo

From my experience those errors are from the trailer not the controller saying it has a issue. I had a 7-pin tester that had corrosion on one of the pins and got those messages on the dash and the DTC in the controller but worked fine with my trailer. I cleaned the corroded pin and didn't get errors any more. If you are sure the trailer is good, I would look a fuses.

patriot993

I will check for corrosion but was getting the error during a code scan at the Indy shop prior to a trailer ever being connected to the Cayenne so seems like there is an issue on the truck side

GrandPaJohn

I'd pull that Pollack connector off and rescan. It's only 4 screws. If the code goes away then it has to be the connector.

patriot993

I wish I had thought of that while at the Indy - not sure my simple scanner will show error but worth a shot!

patriot993

I tested voltage coming out of the Pollack connector as well as with the connector removed (direct connect to the OEM plug) - I am getting about 1V - shouldn't this be 12V??

Getting same voltage for running lights, left stop/turn and right stop/turn. 0V for brake controller output (I haven't installed yet) and 0V for 12V pin (not sure why that is 0V)

KNSBrakes

Be careful with different trailer wiring.

On my 13' CD I plugged in a customer's trailer that was not wired correctly.

It fried the "trailer light ECU" located in the right rear trunk.

Luckily I found it had an Audi part number and I replaced it. It was still about $220 4 years ago so it's probably $350 now.

--Aaron

vwbrd

Ditto. I hooked up a uhaul to my factory installed tow package (that I had never used). Got all kind of warning lights that went away after I unhooked the tow module. Tested the pollak connector and the one inline with it, but nothing. My indy swapped out a tow module of his personal touareg and it was fine. I ordered one off ebay and no problems since. (Granted, I haven't tried to tow anything else). See my post history and you can find it around last August 2022.