A question to "Predictive" Adaptive Cruise Control (PACC) users

[serdar_18fr]

Hi everyone,

If your Mk3 Leon has PACC feature, I'd like to ask you something.

Suppose you just started driving, and you didn't engage the ACC yet. But it's turned on, just waiting in stand-by for you to set the speed and activate it, so it shows two dashes (--) in place of the set speed display at the bottom right corner. For standard ACC users, it stays like that until you set a cruising speed, after that it shows the speed you set, obviously. My question is for PACC users: After you started driving, as soon as the first traffic sign recognised by the camera or as soon as the navigation system provided the speed limit of the street/road you're on, does that cruising speed display at the bottom right start showing the recognised/provided speed limit automatically, instead of two dashes?

I'm asking this because I was told that that is the way it works, by a retrofitter who tried to activate the PACC in my car but didn't seem to succeed. Some other retrofitter says he didn't see anything like that. I have yet to verify those claims because I haven't seen the system at work with my own eyes or didn't have the opportunity to ask someone who already has it.

We've been still working on the subject, trying new things, such as replacing the relatively old infotainment unit with a newer one but couldn't manage to get it to work yet. While testing, I still look at the cruising speed display to check if it works or not, after trying something new, as I'm told by that first retrofitter. But I'm not sure about that anymore. And yes, the so-called retrofitters around here are all clueless chaps.

I would greatly appreciate if anybody around here has PACC in their car and care to enlighten me about it

Thanks & best regards,
Serdar


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[East Yorkshire Retrofits]

Yes it's normal for it to automatically set the speed when it reads a road sign/reads T E navigation data.

If you disable observe maximum speed limit or similar in the ACC menu, this won't happen

As we've mentioned in the past, we can help you get it operating correctly

 

[serdar_18fr]

Yes it's normal for it to automatically set the speed when it reads a road sign/reads T E navigation data.

If you disable observe maximum speed limit or similar in the ACC menu, this won't happen

As we've mentioned in the past, we can help you get it operating correctly

If only I could find a suitable diagnostics device

This will end up me purchasing one I guess.

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[East Yorkshire Retrofits]

If only I could find a suitable diagnostics device

This will end up me purchasing one I guess.

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VNCI 6154a, £70

Will be absolutely fine for the above, most of the job has been done by the previous guy anyway

 

[serdar_18fr]

VNCI 6154a, £70

Will be absolutely fine for the above, most of the job has been done by the previous guy anyway

It is more like £180 around here.

Not sure if it would cost less when personally imported from abroad + shipping + customs duties.

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[serdar_18fr]

Months later, we finally sorted out the problem and managed to get Predictive ACC working

A young guy who works in the retrofitter shop asked me, out of the blue, what happened with my PACC coding works and I told him it didn't work. He said that there is an entry in the long coding of the radar which might prove helpful, we tried and it just worked, almost miraculously

We had tried a lot of different setups on a couple of different units without success but in the end it was just a parameter which is never mentioned anywhere: position_sensitive_detector. We changed it from "not installed" to "installed" and that was it!

We still don't know anything about its relevance and the logic behind it, but I really don't care as long as it works.

Now, ACC sets the speed limit as soon as it receives a speed information from the navigation or TSR catches a speed limit sign. It also displays warnings on the instrument cluster ahead of the speed limit changes, like "50 detected" or "70 ahead", and ahead of junctions/roundabouts with a junction symbol. I also remember reading something about a feature which automatically slows the car down in curves but I'm not sure if that's correct. Also there's a Tolerance setting in the Driver Assistance menu which I don't know about yet, I'll be looking into that.


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