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ParkSense Unavailable

422 Views 22 Replies 5 Participants Last post by  ALFAOFFROAD
My 2019 Stelvio Ti Sport has a “ParkSense Unavailable” warning. It was just in the shop for a four wheel alignment. I changed the f49 fuse just in case that was the issue but the warning is still on. The fuse did appeared to be blown.

I also attempted to have the four black boxes that were installed by Sigma Automotive for the EU type taillights before I knew about MultiECUScan removed and now I have this issue.

I need a competent automotive electrician to remove those boxes. Sigma is now out of business. I am in the Peterborough UK area.

Anyway, first thing is I need some help troubleshooting the ParkSense issue.

Much appreciate any advise,

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Regarding the "ParkSense Unavailable" warning, there are a few steps you can take to troubleshoot the issue:
  1. Check the sensors: Ensure that there is no dirt, debris, or obstructions covering the parking sensors. Clean them gently with a soft cloth if necessary.
  2. Inspect the wiring: Examine the wiring connected to the parking sensors for any signs of damage or disconnection. Ensure that all connections are secure.
  3. Check the fuse again: Although you mentioned changing the F49 fuse, it's worth double-checking that the new fuse is not blown. If it is, replace it with a new fuse of the correct amperage.
  4. Perform a reset: Try performing a system reset by disconnecting the car battery for a few minutes and then reconnecting it. This can sometimes resolve electronic glitches.
Thank you for the breakdown advice. I will place the Stelvio on a lift this Saturday and will check everything you mentioned. I am sure it is probably a fuse somewhere or a relay. Strange to think that I have the Stelvio in the shop for a 4 wheel balance and alignment the same day this issue cropped up. I know that it is probably coincidence.

Update... My friend and I took the black boxes out. They were nothing more than resistors glued to a heat fin. The same resistors that stop your turn signals from hyper-blinking when you install LEDs on an older automobile. Really crap... and grounded. Once we took those out we went down the rabbit hole and we dug into the wiring harness. We noticed that Sigma Automotive cut wires and rewired to other wires in the harness. So, we desoldered and re-soldered with heat shrink all the wires into their correct spots. Everything works perfectly now. I have more lights in the tails lights than before. Taking out that poorly done wiring job fix most of the issues I have had.

Of course, I used MES to reprogram the tail lights to EU lights. Worked perfectly.

Oh, how do I use MES to scan for errors? I could not figure that out. I checked Park Sense and it was on and no issues reported there. But how do I perform a complete scan?

As always, much appreciated,
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I will do that today!!! I don’t remember seeing “scan DTC” but I am sure I will find it.
Okay, I was able to get some time to look into the Park Sense issue. Here are the results. The scan does state;
Other / PAM/NSP (Parking Sensors Module)
Parking control Bosch
ISO Code: 00 18 50 87 15
Errors found:

Among other errors.
Let me know what you think.


Given the description I would start testing relays and checking fuses.

This warning is a clue:

"Value of signal protection calculation incorrect".

Something in the protection circuits isn't right, that means a fuse or relay generally.

Looking at the relay diagrams, I can't find the ones for the power steering system or the park sense. However, from my experiment with pulling BOTH fuses - front and rear - for the brake system and how it killed the power steering too (only when both fuses were pulled)... Might just replace those and see what happens. Fuses are cheap.

I have replaced my fuses since then, if you remember the thread my brake fuse was heat scored. It possible there might be enough scoring/oxidation/heat wear the fuse isn't reporting right anymore. Outside chance but I would look.

Will add when I scanned everything for this recent relay replacement I did, I found several codes - which showed in MES but did not trigger a dash light - relating to the transmission and brake system that were similar. None have returned since replacing the relay.

Check them.
Thank you… I will do that tomorrow at the shop. I will look at the wiring manual tonight and see which ones to replace. I never thought to look at the rear fuses.
Relays, I haven’t found them, yet, either. I will continue to look at the manual. They have to be somewhere in there.
Been a very difficult week for me with very little sleep. Hopefully, I will get some good sleep tonight and figure this out in the morning.
Much appreciated,
Today, I attempted what ALFAOFFROAD recommended to find out that the Tech Authority picture was upside down. I just replaced all the small fuses, 7.5 to 20 amp.
Now, the lift gate doesn’t automatically lift. I had to take out a relay to get to one of the fuses but I reinstalled it back perfectly.
I checked the fuses under the dash and all is fine with those.
This issue seems to get worse the more I touch it. I might just schedule and appointment with the dealer that took advantage of me.
Hopefully, these two issues will be resolved soon.
Now, parksense and automatic lift gate don’t work.
Which fuses? The ones in the rear box behind the panel on the passenger side? Only fuses less then 20amp were changed, so none of the 25amp or higher ones were touched?

Did you disconnect the battery before pulling the fuses?

I'm going to try and figure this out if I can let me know which boxes you changed out fuses in and which fuses specifically. I have the suspicion though .... Wiring is goobered up (modified) somewhere in a way that is screwing things up in a unique way.

.... Technically the lift gate should be like the fuses to the power supply for the power windows and seats, and should be a 25amp or higher fuse. It shouldn't have been effected, but this system could be different.

When working on the car.... Double check everything and look for a second source to verify. Never start taking things off till you verified the instructions are correct. (Learned this the hard way myself with all that stupid brake crap, also when I took apart my fender liner to find relays the turned out to be in a different location then the giulia - haven't mentioned it but I broke the black plastic fender arch where the clips attach to hold it in place and ordered new arches. $400 because the Giulia forum's instructions were wrong for the Stelvio, and no one else had the right ones.🤦 Oh well serves me right for not doing the research myself, and for not thinking the plastic could have become massively brittle after 5 years parked outside in the desert.)

Literally everytime I look at something on this car what I find does not 100% agree with the materials provided by Mitchell-on-Demand, All-Data or especially the supossed "official" Alfa Romeo Documents posted to various forums most of which I strongly believe are preproduction documents and not applicable often. Look at the documents/photos, look at what's on the car.... Then hope your basic understanding of how this all works applies enough to sort out the discrepancies.
I changed all the 20amp and lower fuses in the back on the passenger side compartment. Maybe I stuck one in an empty slot. Been a heck of a day. I will check later.
I finally saw that the Tech Authority pic was upside down and then was able to find the correct fuses.
I did keep the battery connected while I did this. Maybe, a relay popped??? I did have to take one out to get to one of the fuses.
The wiring is now perfect. My friend and I actually re-soldered the wires correctly back into their original locations. That took a while but we did it. So that shouldn’t be an issue.
I will reconnect MES and clear the codes and see what else pops back up.
This has to be something simple that I missed.
I will get some good sleep to night and hopefully will figure this out tomorrow.
So frustrated with myself right now.
However, I feel confident with all the help here I will get this.
Thanks and I really do appreciate all you questions and recommendations.

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Would you be able to take a pic of you fuse panel?
I have a 2019 Ti Sport. I think something is a miss.
Also, would you know what SCR1 and SCR2 fuses are for?
I will label all the fuses on the pic and post it here to the forum. In Tech Authority, they only show you the fuse you look at and not the panel as a whole. So hunt and peck sort of speak.
I believe you might be correct on the fuses. The pic was upside down and I possibly put in a wrong fuse somewhere. That would make sense as to why some stopped working all of a sudden.
View attachment 30584

Definitely strange.

Also strange, that little 5 amp fuse at the bottom right. Little brown fuse in the spot labelled as F90 on the lid..... I can't find a single diagram that says what it is for. The diagrams I find show some fuses I don't have while also not showing fuses I do. Good times......

Pretty sure part of the problem is different markets and translations. Willing to bet Alfa does everything in Italian and translates instruction diagrams from Italian into whatever language they need maybe through multiple steps, IE: Italian to Spanish..then to English. My guess is the people doing the translating from one language to another neither know anything about cars, nor do they speak both languages fluently. Who knows they might just be using Google translate.... And it's filled with bad translations and resulting mis-information. People don't realize, that's what the Japanese do so well that set Honda, Toyota and the rest up for success. They have phenominal translators so their diagrams and instructions are good, translation is viewed as an art form not a worthless expense to minimize.. Alfa.... Not so much.
Perfect… the 5 amp fuse is labeled IBS. There were a lot of systems that also had it listed when I went through all the systems.
Hope that this helps.
I will PM you my a pic of my labeled fuses.
Going to guess that's IBS, intelligent battery sensor, not IBS Intelligent Braking system. :ROFLMAO:

Hmm.. now I'm wondering if that fuse blows it would mean the battery doesn't charge or charges at a very low rate no matter what, and if that may have bearing on a few of the people who consistently have battery problems and just keep the car on a tender.
Sounds like another thread if you ask me.
Make sense but they are Italian so anything is possible, as I found out.
In the morning, I will send you a pic of the IBS schematics. That could assist in clarifying some things. It will show all the connection paths and fuses and relays.
I hope I can do that without breaking the rules from Tech Authority??? They were very specific not to reproduce anything from it when I ordered the usb sticks from them.
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