QX80 BCI malfunction.

[MJEX37]

Hello. I have a problem with QX80 2016 and bci malfunction error. It is accompanied by error U1000 in the ICC/Adas section.
Side radars - they work properly.
Front and rear parking sensors - they work properly
I checked the brake pedal sensors with a multimeter - they work properly
Icc sensor - it works properly

Rear auto braking does not work.
Where is the problem U1000?
And why does the car not brake by itself?

[VStar650CL]

The U code in the ADAS is probably derivative, from the ABS kicking offline momentarily when it initially throws a code. The "BCI Malfunction" error on the dash means a bad brake pedal switch about 99.9% of the time. You can't check them with a meter, because the usual problem isn't failed contacts, it's a loss of synchronicity between the two switch throws.

[MJEX37]

Ok tomorrow I'll install the brake switches from my mom's QX70 and see what happens.

[MJEX37]

I changed two brake switches. U1000 and BCI is still there.

[VStar650CL]

You'll have to clear the DTC's proactively, I don't think the ABS will clear them automatically. Most ABS codes have to pass SRT multiple times before the error even goes "past" instead of "current".

[MJEX37]

I used a diagnostic computer to erase U1000. After erasing, the U 1000 error returns immediately.

[VStar650CL]

U1000's are notoriously difficult to track down because they don't tell you which other system the C/U throwing the code isn't hearing from. The usual procedure is to compare the systems showing up on the scan with what should be there according to the LAN section in the FSM. Whatever system is MIA is causing the code. In this case, since your RAB doesn't work and the ADAS and side radars are present, the prime suspect would be the Sonar.

[VStar650CL]

PS - I assume the ABS, meter, and tran-ny are all showing up, are there codes in any of them related to vehicle speed? VSS codes will cause RAB to go offline even though the system throwing the VSS code may still be online, and can produce a U1000 because a speed signal isn't being sent.

[MJEX37]

U0100 also appeared. The repair manual says to measure the resistance on the E80 connector on pins 146 and 151. But there are no cables in my plug on these pins :-(. The car is from 2016 and the manual is from 2015.

[VStar650CL]

U0100 means the transmission lost communication with the ECM. Since the ECM being offline would result in a whole herd of U1000's, chances are the problem is in the TCM's receiver and not the ECM. It can't be a continuous issue with the CAN wiring because the TCM wouldn't be able to talk. So you're looking for something intermittent. Broken solder on the TCM mainboard is something that happens pretty frequently with Nissan TCM's which live inside the transmission. If you want to give me your email, I can get you a PDF of the '16 A/T wiring.

[MJEX37]

Great. If you have the 2016 manual, it will definitely be useful. My mail is [email protected]

[VStar650CL]

I can't get you the FSM because Nissan has eliminated all the PDF's, but I can get you specific wiring and harness documentation. It's for your personal use, don't post or share it. Check your inbox.

[MJEX37]

Thank you very much for your help and the documentation you provided. Sure. The documentation stays with me. I won't show it to anyone. The documentation for the ECM would also be useful. And the E80 connector

[VStar650CL]

E80 is E20 on the '16. I emailed you an ECM reference and the engine wiring.

[MJEX37]

Thank you very much, I will try to measure.

[MJEX37]

Write me if I can buy the entire LAN manual somewhere. The 2015 manual says to measure the resistance on the E80 connector on pins 146 and 151. If I have the entire LAN, I think I can handle it.

[VStar650CL]

The LAN section of the FSM is pretty huge, but I can get you the CANbus WD. Does it have Intelligent Cruise?

[MJEX37]

Yes it is. I will accept any help my service does not even want to see the car. I live in Europe and here this wonderful car was not even offered.

[VStar650CL]

Just sent you the CANbus WD, check your inbox.

[MJEX37]

Thank you very much. Now I will not be able to return until Thursday to continue diagnosing the car. I will let you know what happens.

[MJEX37]

I measured the entire CAN line. Each module is fairly functional:

The front radar detects the car in front of me.

The front and rear parking sensors give an audible signal and correctly display warnings on the screen.

The side radars detect a vehicle in the blind spot.

The fuses have been checked.

However, the car still does not brake automatically in front of an obstacle behind.

[VStar650CL]

I just sent you a CAN signal chart. The ADAS C/U is referred to as "ICC" in the header. To use it, "T" indicates the tran-smitter originating a signal, "R" indicates the receiver. Find all the R's for the ICC/ADAS. When any corresponding T doesn't arrive at the R, the receiver throws U1000. So you need to determine which of the T's isn't tran-smitting an expected packet.

[MJEX37]

I checked everything. Everything is fine. Maybe the ADAS module itself is causing the error? I live in Europe. I ordered a used one in the US. It has the same problem.

Could something be unprogrammed and causing the U 1000?

[VStar650CL]

Sure. If there's a wrong or incorrectly-programmed part which isn't sending out a message that the rest of the C/U's in the car expect to hear, that will definitely cause U1000's.

[MJEX37]

Wszystko jest w należytym porządku. Ale BCI nadal nie działa. Wiesz czy na tej stronie można kupić beckup? Może jednak coś jest nie zaprogramowane? Przejrzałem wszystko i nadal nie działa. ;-(
na wszelki wypadek zrobiłem swoją kopoie zapasową. Nie mogę znaleźć.
https://www.nissan-techinfo.com/Home.aspx

[VStar650CL]

You can't reprogram the ADAS without a Consult3, but a '16 should come with a program already in it if you want to try replacing it. They didn't start sending all the C/U parts unprogrammed until the end of '17, so C/U's (except the ECM and TCM) for models earlier than that are usually still shipped with a program already loaded.