Fedex delivered my new BCM today.

I will attempt to install it myself over the weekend.
Will need to re-register they keys and the key fobs without the dealers help.

Have been getting conflicting information about the dealer requirements for this replacement. Some say that the dealer needs to program certain things, some say they don't. Got a BCM with the same model # as the original.
It's a early model G35 sedan (build in April 2002).. Will see what happens tomorrow.

Just curious, what was the point in doing this?

How are you going to reprogram the transponer in the keys? You can reprogram the key fobs yourself though.

I didn't know the BCM required reprogramming of the keys. I thought the was inside the ECU?

...

Those things you lighlighted are from the key fob. (alarm related)

The key itself is (IVIS)nats related. (transponder chip in the key and it's signal to the ECU)

That is my understanding

But great info anyway

The key fobs no longer function for some strange reason. I got a BCM for $100 on ebay which is what it would cost me at the dealer for them to even look at the problem.

The reprogramming process for the key fobs is available pretty much anywhere. google it.

I assume you tried replacing the battery in the key fobs?

my reference wasnt to say ECM has no related function - it was to show you why the BCM is involved (his fob doesnt work, the chip is in the key).

Just looked through the service manual, "When replacing BCM perform initialization of NATS system and registration of all NATS ignition key IDs."

this I cannot do myself. Will need to have the dealer do it , or I heard some locksmiths can do this too.

I've heard locksmiths can do it too - but they will be expensive (maybe same as dealer?)... unless you are trying to hide this from dealer, I'd take it to them.

So - why are you doing this again? Did your key and fob stop working?

Yes key fobs stopped working. Re-registering them doesn't work either....

Not trying to hide anything from the dealer. The car is long out of warranty, and has 175,000 miles now. ( am the original owner)..
Just trying to save the approx $450 for a new BCM and probably around $300 for labor to get the replaced and reprogrammed.

I will replace the BCM tomorrow and try to see if I can re-register the fobs . If they work, I would have to then tow the car to the dealer as I won't be able to start it. A locksmith can come out to the house....

Maybe the battery in your key died? lol

document everything here so people have a real answer . The chip keys will need to be reprogrammed for sure . Nissan Dealer is usually cheapest . There may be other stuff that they need to reprogram on it as well . Dealer wants around 1000+ to install a new bcm not counting the actual unit .

Can you still drive the car? ie.. key is still reconized by the ecu.

If yes, I'd try replacing the batteries in the FOBs first. (I've mentioned this before) Sure as hell alot easier than replacing the bcm

Guys you won't believe this. Before ordering the BCM, I replaced the batteries in both key fobs I got. Neither worked.... After reading the service manual, I tried to re-register the fobs with the BCM, but that didn't work either.
Next I checked all fuses on the car.. No problems there. Briefly mentioned it to the dealer, both I and them thought it was the BCM. Ordered a new BCM which arrived today. Installed new BCM, which by the way only take 10 minutes to do. (not sure why dealer wants so much money for labor - even programming the new one it doesn't take that long)..

Anyway, the new BCM didn't work either. I went back and checked the key fobs and batteries again. No problems found but since there are no LEDs or anything on the fobs there really isn't a way to check if they worked.

Then I borrow one of the fobs from my wifes car, same fob by the way. Tried to add to the BCM and it worked.

Therefore, it appears that both of my key fobs died. What are the chances of that.............