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No. In Nissan terms “replaced” is pretty much meaning superseded. That’s the old number.
Hello I had a great day, the BCI Malfunction has been fixed. Three things; replace BOTH switches on the break pedal, break switch and cruise switch. Also go to the two sonar boxes in the rear of the vehicle, they are off set in the rear end. Lightly knock on the area around it and see if rock and debris falls out. Also look for the boxes and make sure they are not covered in mud. If the are clean them gently. Lastly, one note in the manual, make sure all of the air in your tires is correctly filled, strange but it say the BCI can malfunction if the are under inflated. Good luck but I'm hyped, right now the car actually drives and breaks better and the collision warnings are working properly. BTW this only cost me a little over $100.

Hello I had a great day, the BCI Malfunction has been fixed. Three things; replace BOTH switches on the break pedal, break switch and cruise switch. Also go to the two sonar boxes in the rear of the vehicle, they are off set in the rear end. Lightly knock on the area around it and see if rock and debris falls out. Also look for the boxes and make sure they are not covered in mud. If the are clean them gently. Lastly, one note in the manual, make sure all of the air in your tires is correctly filled, strange but it say the BCI can malfunction if the are under inflated. Good luck but I'm hyped, right now the car actually drives and breaks better and the collision warnings are working properly. BTW this only cost me a little over $100.
Also the old switches replaced were blued (high heat) and burnt, obviosly a fault in the switches design and function.
 

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Sorry to revive an old thread - my 2018 is doing this and will reset with a key cycle... sitting at dealership now. Anybody have any resolutions to post?



So, I left out one detail that also started happening when the BCI Malfunction started - The truck would occasionally only go into ACC mode when we would try to start. The BCI issue was occurring at least once a day.

Apparently, they found that the brake switch was bad,so they replaced it. And, it's been over a week and about 1600 miles (road trip) and no more codes..



For reference, here is the part # for the brake switch that was replaced - 25320-AX-10A SWITCH ASSY-STOP
Sorry to revive an old thread - my 2018 is doing this and will reset with a key cycle... sitting at dealership now. Anybody have any resolutions to post?



So, I left out one detail that also started happening when the BCI Malfunction started - The truck would occasionally only go into ACC mode when we would try to start. The BCI issue was occurring at least once a day.

Apparently, they found that the brake switch was bad,so they replaced it. And, it's been over a week and about 1600 miles (road trip) and no more codes..



For reference, here is the part # for the brake switch that was replaced - 25320-AX-10A SWITCH ASSY-STOP
hi Todd, thanks for your post. I am experiencing the same issue with both the BC I malfunction and the brake switch. I’m wondering if replacing the brake switch solve the BCI malfunction for you?
 

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hi Todd, thanks for your post. I am experiencing the same issue with both the BC I malfunction and the brake switch. I’m wondering if replacing the brake switch solve the BCI malfunction for you?
Replace both the break and cruise switches, check the sonar boxes for debris and inflate tires to spec. Read above it worked for me no more issues.
 

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My 17' Armada started doing the same thing four weeks ago and has been very intermittent. Because some have had luck with the brake switch I ordered one:

Part No.: 25320-AX10A
SWITCH ASSY-STOP LAMP

from Nissanpartsdeal along with the cruise control switch:

Part No.: 25300-AT30A
SWITCH ASSY-ASCD CANCEL
Replaced by: 25300-3RA0A

The OEM stop lamp switch installed in my vehicle (I have owned my Armada since new) was indeed manufactured by Valeo and was all black in color. The replacement part I ordered was black and green in color. I have replaced the switch and will see how it works. After reading through this thread I don't have a lot of faith that it will be fixed for good. Based on some posts I wonder if there could be an issue with the position of the switch in the vehicle based on the plastic piece that holds the switch in place. That could be flexing/moving over time and causing a similar issue to an intermittent contact in the switch. I have not replaced the cruise control cancel switch yet because I want to see if changing the brake switch makes any improvement at all.

My only ask in here is some posters are coming into this thread, posting that they have had some success with their dealer but then not following up with what actually took care of the problem (if anything). Please take a minute to post a follow up with an explanation of what the dealer did do to successfully repair. I will definitely post my DIY experience because my vehicle has 46K miles and is now out of warranty. I like it too much to just trade it off yet. We shall see.

Update: Almost two weeks now since I replaced the Stop Lamp Switch Assy. with the part I listed above. Prior to replacing it my Armada was having the BCI malfunction on every drive even if it was only a few miles. So far it has not returned. Will keep updating this post as time goes on.
Updating my post again. It's been nearly 3 months and just over 10K miles of driving with no BCI Malfunction error. Just replacing the stop switch on mine took care of the error completely. If you have this error definitely replace that switch first. I did order the cruise control switch (ASCD CANCEL) but did not replace it yet.
 

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I recently encountered an issue with the BCI system where it was indicating that "BCI warning system unavailable". I took it to the dealership to have them check it out. The system had started working properly again prior to arriving at the dealership, but the tech indicated that they pulled a code "C1B55" radar blockage right rear. They suggested that the vehicle undercoating process may have coated the radar sensors causing an issue. Does this make sense? I have had the vehicle sprayed each year with the "Corrosion Free" rust check system since it was purchased new in 2018 (currently has 30K kms on it). The tech said that he blew air inside the rear fender but would have to remove the bumper covers to clean the sensors if the issue continues. Would the rust check process have an impact on the radar sensors?
 

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Today while I was driving suddenly the BCI malfunction light came ON. I had to turn the engine off and fire it up again to make it go away. Anyone have this come up? Not sure why it popped up. Backup camera and sonar is functional.
I've had it happen twice, both times it has been a bad brake switch. Must be a bad designed switch.
 

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I recently encountered an issue with the BCI system where it was indicating that "BCI warning system unavailable". I took it to the dealership to have them check it out. The system had started working properly again prior to arriving at the dealership, but the tech indicated that they pulled a code "C1B55" radar blockage right rear. They suggested that the vehicle undercoating process may have coated the radar sensors causing an issue. Does this make sense? I have had the vehicle sprayed each year with the "Corrosion Free" rust check system since it was purchased new in 2018 (currently has 30K kms on it). The tech said that he blew air inside the rear fender but would have to remove the bumper covers to clean the sensors if the issue continues. Would the rust check process have an impact on the radar sensors?
If the tech was able to pull that specific code than yes, I would assume whatever it is you are having sprayed on the underside of the vehicle could have covered up that sensor and thrown the code. If they clear the code, clean the surface and the error comes back again you could have another problem with a sensor failure not related to the coating you had applied.
 

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If the tech was able to pull that specific code than yes, I would assume whatever it is you are having sprayed on the underside of the vehicle could have covered up that sensor and thrown the code. If they clear the code, clean the surface and the error comes back again you could have another problem with a sensor failure not related to the coating you had applied.
Thanks for input. The rust check spray was completed back in November but am just having an issue now. One would expect that if it were that, it would have caused issues right away. Will see if the code comes back or have any further issues.
 

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Today while I was driving suddenly the BCI malfunction light came ON. I had to turn the engine off and fire it up again to make it go away. Anyone have this come up? Not sure why it popped up. Backup camera and sonar is functional.
[

Same thing here and it was my remote.
 

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I had the BCI malfunction and a hard time starting my 2019 Armada. I bought a Brake Light Switch from Rockauto, and replaced it. It took about 2 minutes to remove the old and put in the new. I continued to have the BCI malfunction. I saw someone post in this thread to get an older Brake Light Switch from a junkyard. I don't have any experience with junkyards, so I went to Ebay and bought a 2010 Infinite Brake Light Switch (used). After I installed the 2010 brake light switch, I have had 0 problems and the collision system works better than it ever has. If I were you, I would buy an older Brake Light Switch, my price shipped was 15 bucks, and it should take care of the issue. Hope this helps!
 

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I had the BCI malfunction and a hard time starting my 2019 Armada. I bought a Brake Light Switch from Rockauto, and replaced it. It took about 2 minutes to remove the old and put in the new. I continued to have the BCI malfunction. I saw someone post in this thread to get an older Brake Light Switch from a junkyard. I don't have any experience with junkyards, so I went to Ebay and bought a 2010 Infinite Brake Light Switch (used). After I installed the 2010 brake light switch, I have had 0 problems and the collision system works better than it ever has. If I were you, I would buy an older Brake Light Switch, my price shipped was 15 bucks, and it should take care of the issue. Hope this helps!
Part number for the one you ended up with?
 

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Have same issue BCI malfunction this is my 4th time since I owned the car when it comes on the dash lights up then next time I shut off the car it does not start. 1st time Nissian has no idea what caused it changed my battery told me my battery was bad. Second they changed the brake switch. 3rd time they said the brake switch must have been bad and changed it agin. Now 4th time after calling Nissian North America and opening a case they parachute some master mechanic in who claims he can’t replicate the problem and can not recommend any fix at this time. 20 minutes after I hear this from my case owner the dealer calls me and said they figured it out. It’s the ABS braking system and it’s 4k plus I should call my case owner and ask if they will honer it under warranty since they believe this was the issue all along. I explained to my case owner how does the mechanic fly in and have nothing and now the dealer claims they have figured it out. Still they won’t fix it they like me to put my family back in a vechical that they now believe has an ABS braking issue and historically leaves me stranded in a car that won’t start. Most expensive piece of junk never buy another Nissian every again. Contacted a Lawyer hoping they can help.

Have you ever contacted an attorney for this? Class action lawsuit perhaps?
Have same issue BCI malfunction this is my 4th time since I owned the car when it comes on the dash lights up then next time I shut off the car it does not start. 1st time Nissian has no idea what caused it changed my battery told me my battery was bad. Second they changed the brake switch. 3rd time they said the brake switch must have been bad and changed it agin. Now 4th time after calling Nissian North America and opening a case they parachute some master mechanic in who claims he can’t replicate the problem and can not recommend any fix at this time. 20 minutes after I hear this from my case owner the dealer calls me and said they figured it out. It’s the ABS braking system and it’s 4k plus I should call my case owner and ask if they will honer it under warranty since they believe this was the issue all along. I explained to my case owner how does the mechanic fly in and have nothing and now the dealer claims they have figured it out. Still they won’t fix it they like me to put my family back in a vechical that they now believe has an ABS braking issue and historically leaves me stranded in a car that won’t start. Most expensive piece of junk never buy another Nissian every again. Contacted a Lawyer hoping they can help.
Have you contacted an attorney for this yet? Class action lawsuit?
 

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Yep! I got mine (2019) fixed for the same issue. On had it for 6 months. Was told it was a braking system that caused the issue
 
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