Originally Posted by raygun

After a little more digging, I found this procedure which claims to work for the '05 XTerra. It's not clear if this will program the key, or if it's just for the remote fobs. :shrug:

https://northcoastkeyless.com/2005-n...-instructions/

I promise nothing, and read the disclaimers, but, since you're currently stuck, it's worth a shot.

Originally Posted by cleric670

The key itself has an RFID transponder embedded inside it. The lock cylinder also has an antenna to read the chip. When you insert the key that data is sent to the BCM, if the BCM recognizes the key it will tell the ECM it's ok to start.

This is part of NATS Nissan Anti Theft System, it's a program that's shared between the BCM and ECM.

The BCM can be programmed by either the dealership or some locksmiths with the right computer, this rewrites the existing list of allowed key transponders, you cannot "add" to the list, nor can you remove single items. You program ALL the keys at the same time because it completely overwrites the existing list when you start programming.

Your original key data was overwritten by the previous locksmith. Call around and see if there's anyone locally who can program the BCM to accept your current keys (if your keys will actually turn the lock cylinder). Explain your financial situation to them and see if they'll do some kind of delayed payment or partial payment program. Try to avoid the dealership because they will not come to you, you will have to have your vehicle towed to the dealership to have it programmed.

Just so you know when this happens (which is VERY common) most people just have their vehicle towed to the dealership then pay the 1 hour service charge plus the cost of a new key. Key $125, 1 hour service $125, tow truck $200. So it's not cheap, treat those keys like it's a $500 bill because that's basically what they are.

Originally Posted by rgp

Hi all,

I'm new here.

I've recently acquired a 2004 G35 2-door 6MT that appears to need a BCM. I've been reading up on the procedure for replacing it, if it does in fact require a new BCM. As a test, I tried the online BCM pin decoder that is referenced, and it came back with **two** different four digit pins for the alphanumeric code from the BCM that I input. This leaves me questioning if the site is still valid and trustworthy.

Has anyone used the site lately, or verified its accuracy? Anyone also get more than one four digit pin?

Thanks