It's been a while back . That lock was replaced they also replaced tranny. Bout same time
That's all that is in the history for this car from dealer and car fax . I know it got wet floor board was wet . But I pulled ECU checked it . Was dry. The bcm is right there I couldn't feel no moister around it. The water seems like it came from somewhere near or under the fan.i did all the reset computer and drove it . It will not shut off if you get it started. And before it start security light still flashing . And I have to put key fob in holder but if it starts it's without hitting the button it just will start when you hold the clutch for a while by its self. I have dump clutch shut it off. And take battery cable off to get the power off inside car I.e. the push button on light and warning lights on dash . It will throw a code u0164 communication HVAC . It will go away and come back as car is running or shut off. I took it to dealer for them to diagnose it. We shall see.it didn't do this till I went threw car wash . So I don't think it flood car I thing a seal around wind shield or wiring harness allowed water in.

I hope whatever it is, that is not too much to fix and that you can get your car running right soon. Keep us updated so we are aware and perhaps avoid it.

definitely BCM, ECU I believe is more gauged towards the Motor components where as the BCM is more accessories, seeing as how the drivability is fine it leads one to believe BCM. BCM went on the Fritz in my Altima and had very similar issues as far as car turning on and accessories not functioning as intended, it would also not turn off, i eventually had to pull the alternator cable and let it die otherwise it would have burned through the tank, I ended up bringing it to Nissan and they diagnosed it with a bad BCM and Remote start.

It was purchased as a CPO with the aftermarket remote starter installed but they refused to service it because of this reason, I argued it shouldn't have been a CPO without Nissan genuine parts but thats another story, they found minor burns in the wiring connection between the BCM/Remote Start and Dash, I was lucky enough to get it serviced for free after a 2 week battle, however new parts pointed upwards of $2,000.

I would advise you double check all fuses and wiring that you can at this point, anything thats been unplugged or attached since service on ur Z

Well they say steering lock not communicating. They want 1200 for that and then may be more .. that's latest....I don't think it's lock cause it locked wheel sitting here at house and unlocked I think they just use that as go to to make money off us because it wasn't included in the recall like the Sentra and maximum. I called Nissan to complain and open a inquiry why us as a group are getting stiffed in the recall. And made them aware of the deals using it to profit . First thing out there mouth it's the steering lock.

I think the bcm got fried but the first thing out there mouth is steering lock

That's where they will start because 1)it's easy and 2) they don't know how to properly troubleshoot. IMHO, if you can get a BCM from a salvaged 370z (2009 or 2010) that hasn't been water damaged already, it's worth a shot. If the car does everything it's supposed to, then you are probably done. What I don't know is if the BCM & the ECU have to match (as in both from a Z). GL

It may have be programed to see the vin

I'm interested in what kind of car wash you did

just a pipe rack car wash basically a four pole with spray nozzles. I got car back , the car started on its own with no one in it in the shop , without clutch in.they was saying steering lock cause it wouldn't start , till it started on its own they told me it wouldn't after I had started like 12 times and heard and felt steering lock , lock and unlock , so I had go back down there and get them on the same page told them we are not replacing the steering lock . we are starting where the water came in (around the wiring harness the cavity filled up and water ran down the harness to the bcm and filled it up with water)and what is right there , the bcm , replaced bcm and everything works now , except the hatch will not open ,may have fried the trunk lift assist, but I drove it to work and it was fine till I stopped and got out car and came back and key light came on ill be pulling the fuse in morning before I leave work.

I pulled lock fuse and key light still on . is it suppose stay on when fuse is pulled . from the lock ?