I've been reading a lot lately about how easy it is to bypass the factory security system and gain access to our Gs. It seems the preferred method is to pop the drivers side door lock cylinder out and use the wires there to disarm the alarm, unlock the door, and, if wanted, put the window down.

The reason this can be done is because of the fact that the drivers door lock is hardwired to the BCM of the car so that you can put the windows down and so you can unlock the passengers side door from the drivers doorlock.

If you cut the wire that runs between the actual lock cylinder and the window control module (yellow wire in my 04 coupe) you will prevent thiefs from using this method to bypass the security system. You will lose the ability to unlock the passengers door by using your key IN the drivers cylinder, you will lose the ability to put the windows down by using the cylinder, but, you will still be able to unlock the drivers door using the key. The drivers door lock switch will still lock and unlock all doors, and you will still be able to use the factory remote to lock, unlock, and put the windows down.

If you never use your key in the drivers door (like me) and live in a high auto theft area (unlike me) I would suggust you cut this wire and make it a lot harder on the bad guys.

I have never tried any of this myself, but according to the research I've done into the window control module I'm working on and based on the schematics of the locking system it should work flawlessly. Someone needs to try this out and report back to us!!!!


Kevin
----------------------------------------------------------------
04 Diamond Graphite Coupe - FULLY loaded
Windows up with OEM Remote

 

I guess I should at least tell you all how to do this... it's pretty simple and I will do it to my car as soon as I get a chance.

Pop the housing the contains the door lock switch and power window switchs off of the drivers door. It's just held on by a few metal clips, just pull straight up on it from the end closest to the back of the car. Once you have it romoved you will see all the wires going into the power window module. The wire you need to cut will read 5vdc at all times EXCEPT when you turn the key in the cylinder to LOCK. When you do this it will go to 0vdc. As soon as you release the key from the lock position the wire will go back to 5vdc. Make sure you somehow insulate the wire coming from the power window module as it will still have 5vdc on it after you cut it. It would be a good idea to also tape (or insulate somehow) the other end of the wire. Hope this helps some people.


Kevin
----------------------------------------------------------------
04 Diamond Graphite Coupe - FULLY loaded
Windows up with OEM Remote

 

kpierson,

Thanks for the post. Question: What does BMC stand for?
I'm very concerned about the security of my G.

Thanks again,
Blksnake

 

BCM stands for Body Control Module

Another much talked about component is the:

ECM stands for Electronic Control Module

BCM is basically a computer in the car that controls the door locking, security system, door pins, dome light, power windows, and other such electronic components (Basically convienence stuff)

ECM is what controls the engine and monitors all the sensors monitoring it. Without a working ECM the car will not run.


Kevin
----------------------------------------------------------------
04 Diamond Graphite Coupe - FULLY loaded
Windows up with OEM Remote

 

Thanks for the info Kevin. I'm not sure how much different the sedan is in this situation, but if you have any additional info for us sedan owners, please let me know. I know for a fact that a 350Z was stolen from the parking structure where I work. I don't know how they started the car, but the security guards confirmed that the 350 was stolen. I'm pretty sure 350's have the same security chip that we do...

- NICNoobie

2003.0 AT Brilliant Silver Sedan
Premium Package\Graphite Leather\Signaling Clear Corners\AEM Intake (w/ Bypass Valve)

"Why are you my English not being understanding?"

 

That gains access to the interior, but they still shouldn't be able to start the engine and drive off without a transponder chip.

 

From what I understand once a thief is inside the car the transponder anti theft system is not that hard to bypass, although I'm not exactly sure how to do it.

Kevin
----------------------------------------------------------------
04 Diamond Graphite Coupe - FULLY loaded
Windows up with OEM Remote