Trailer Plug disables ACC

[TaycanCook]

For those with CTs running a carrier w/ trailer plug, do you also have the ACC disabled? I am running the same plug as @ciaranob with a curtis aux led lights on my yakima box. Was doing a test run yesterday and noticed the white notification that ACC is not available and continue driving.

• Those running the porsche bike carrier, with the trailer plug - is acc available?
• Those running the @bsclywilly trailer plug - is acc available?
• Those running the same 4-pin converter as @ciaranob - is acc available?

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[ciaranob]

For those with CTs running a carrier w/ trailer plug, do you also have the ACC disabled? I am running the same plug as @ciaranob with a curtis aux led lights on my yakima box. Was doing a test run yesterday and noticed the white notification that ACC is not available and continue driving.

• Those running the porsche bike carrier, with the trailer plug - is acc available?
• Those running the @bsclywilly trailer plug - is acc available?
• Those running the same 4-pin converter as @ciaranob - is acc available?

Need to check but I don’t recall having ACC disabled with my LED lights+plug. Will get back later to confirm.

 

[bsclywilly]

My ACC works fine with the plug in. The only time I’ve had the “ACC not available” message was when the sensor lens in the bumper got covered (not using the plug at the time, just to be clear).

Does the msg disappear and reappear if you unplug and plug the lights in or was it a one time thing?

 

[TaycanCook]

If I keep the trailer plug connected, ACC is disabled. If I disconnect the trailer plug, acc is re-enabled. Looks like there is something unique about my plug or just this adapter in general because the @bsclywilly plug doesn't disable ACC.

 

[ciaranob]

If I keep the trailer plug connected, ACC is disabled. If I disconnect the trailer plug, acc is re-enabled. Looks like there is something unique about my plug or just this adapter in general because the @bsclywilly plug doesn't disable ACC.

That or perhaps somehow the light system you're using (different to mine correct?) - the one element that is different in our set ups but agreed seems more likely to be the pin outs in the plug .... odd!

 

[FredC057]

I have the Porsche bike rack and the European plug.
Acc and innodrive is working fine.
I was afraid they wouldn’t when I started my travel but the message was PLC assist not active with trailer.
What is not working is the lines on the back up camera when you reverse. Normal but i still can see under my bikes.
And I think the Porsche line change side assist that let’s you know somebody is in your blind spot. I don’t recall seing the little lights in my mirrors and it would make sense that the radar detector are not working properly.

 

[TaycanCook]

I have the Porsche bike rack and the European plug.
Acc and innodrive is working fine.

Thanks. There is clearly something up with my setup. I'll investigate and keep you posted.

 

[ciaranob]

And just to re-emphasize for others that might want to use the plug I recommended (in post here #7 ), the std trailer plug converter (Carrofix) I purchased to replace that provided by Will works 100% correctly on my car (other than some initial in-dash advisories due to lower load LEDs vs incandescent bulbs which you can dismiss with three clicks in the dash with no impact on function).

I can also confirm no loss of ACC and all functions of the car remain as they should do - no beeping on reverse and rear hatch etc., all just works.

I have CURT lights - you mentioned Curtis lights - I know you mentioned getting the same unit I had but are these different?

 

[dickp]

For those with CTs running a carrier w/ trailer plug, do you also have the ACC disabled? I am running the same plug as @ciaranob with a curtis aux led lights on my yakima box. Was doing a test run yesterday and noticed the white notification that ACC is not available and continue driving.

• Those running the porsche bike carrier, with the trailer plug - is acc available?
• Those running the @bsclywilly trailer plug - is acc available?
• Those running the same 4-pin converter as @ciaranob - is acc available?

"Those running the @bsclywilly trailer plug - is acc available?"
I have this plug, and mine does indeed disable the warning lights in the outside rear view mirrors (ACC) & I get a white message warning when starting the car. Because of this, I am not using the plug. I had the Porsche rear bike carrier for awhile & when the light plug was in use the same thing happened.
OOPS, I got ACC & LCA confused. ACC works fine when using the plug, but LCA is disabled.

 

[bsclywilly]

@TaycanCook @dickp could it be you both are describing LCA lane change assis being disabled? That is normal because it relies on the rear sensors.

When I was referring to ACC, that is active cruise control.

 

[dickp]

@TaycanCook @dickp could it be you both are describing LCA lane change assis being disabled? That is normal because it relies on the rear sensors.

When I was referring to ACC, that is active cruise control.

Yes, I was mistaken. The plug does disable LCA. But I like that feature so I tend to not use the plug. Thanks for pointing out my confusion.

 

[TaycanCook]

I'm in agreement that LCA is off and is designed to be off.

That or perhaps somehow the light system you're using (different to mine correct?) - the one element that is different in our set ups but agreed seems more likely to be the pin outs in the plug .... odd!

I have the same aux lights as the one you had posted. I've a theory of why this is not working. I think that if the notification comes up that there is a "defective" trailer BRAKE light, ACC is disabled. It's fine that the left and right indicator for the trailer lights are "defective", but not the brake light.

I'll check the draw later and add load resistors to test if it fixes the problem.

 

[ciaranob]

I'm in agreement that LCA is off and is designed to be off.

I have the same aux lights as the one you had posted. I've a theory of why this is not working. I think that if the notification comes up that there is a "defective" trailer BRAKE light, ACC is disabled. It's fine that the left and right indicator for the trailer lights are "defective", but not the brake light.

I'll check the draw later and add load resistors to test if it fixes the problem.

Well I get three white ‘ advisories’ in the right-hand dash main display when I first hook up the plug-lights combo and they are one each for the Brake, the Left and RIght indicators. Doing nothing else at that point (i.e. car still in Park etc) there are no errors in ref to LCA nor to ACC.

I simply hit the ‘Return’ arrow on the steering wheel to acknowledge each of the three advisories and they stay away permanently (unless I shutdown and restart the car) - and again after dismissing the advisories, no issues re ACC nor LCA.

So as you have my exact setup, it sounds like it must be something else - very weird. Might need to compare our car’s specs to rule out some other type of component interactions?

PS: Forgot to ask - if you dismiss the advisories does everything go back to normal operation?

 

[satchurator]

I wonder could someone measure the resistance of all of the conductors/lights of the Porsche carrier and share that in order to allow replication of similar load ranges on other plugs / lights?

 

[TaycanCook]

Well I get three white ‘ advisories’ in the right-hand dash main display when I first hook up the plug-lights combo and they are one each for the Brake, the Left and RIght indicators. Doing nothing else at that point (i.e. car still in Park etc) there are no errors in ref to LCA nor to ACC.

Yep, I have the same behavior.

I simply hit the ‘Return’ arrow on the steering wheel to acknowledge each of the three advisories and they stay away permanently (unless I shutdown and restart the car) - and again after dismissing the advisories, no issues re ACC nor LCA.

At this point, unless ACC is engaged, there is not an advisory. After I engage ACC, it tells me that it's not available.

So as you have my exact setup, it sounds like it must be something else - very weird. Might need to compare our car’s specs to rule out some other type of component interactions?

PS: Forgot to ask - if you dismiss the advisories does everything go back to normal operation?

All is nominal except for ACC.

CT 4S, Premium Package + RAS + 150kw/400v + powered charge ports. I'm now tinkering w/ the adapter to see if it's related to how the 13-pin to 4-pin adapter is setup (resistance).

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