I think i read that shops can usually turn off codes with tuning software, for example stopping the code that shows rear o2 sensors when you have them removed. Well my car has an aftermarket alarm that bypasses the factory alarm. The problem I have though is the thing inside the key cylinder that reads the resistor on the key is broken. Since my car has an aftermarket alarm the car still starts normally but the security light stays on the whole time I have the car on. When i use remote start on the car it doesnt show up but the second i take it out of the remote start mode with the key in the ignition it pops back up. I checked and it actually shows a code and when i clear it the security light goes away but then it pops back up. So I just want to disable that code from coming on, can this be done with tuning software?

 

Here's a screen shot from my EFI software. Looks like it's possible.



Strange - looks like you can turn column lock off also???

 

That key has a resistor. You can measure the resistance of the pellet and duplicate it by removing the 2 wires from the cylinder and putting a resistor of equal resistance across the wires. If no one else gives you the answer on how to do it with software, then this will work. Any good stereo shop will know how to do it, so you won't have to pay some dealership to do it if you don't have the tools or aren't inclined to do it yourself.

 

The tuning software only interacts with the PCM. It can turn off codes, but only those beginning with a P (PCM codes).


The security system is a function of the BCM, and tuning software (other than a TechII), can do nothing for that module.

There are 2 security functions of the pass key...the start inhibit (likely already bypassed when your remote starter was installed), and the PCM fuel cut, which will kill the car at anything more than idle (the job of the PCM), which also may already be defeated on your car..

Setting the Anti-theft feature (pictured above by Patches) to "none" in the PCM will only eliminate the fuel cut, it does nothing to affect the BCM logic, which is the source of your code. The above setting was put into EFI-Live mainly for LSx engine transplants into cars using a PCM, but not using a BCM.


So, the short answer is no, you can't cure the code with tuning software....btw, what code are you getting?

If it only is a matter not recognizing the resistor pellet, there is a way to bypass that by connecting a normal resistor (of the same value as your key) to a couple of wires in the harness that runs to the ign switch...but I'd have to go look at some schematics to tell you exactly.

 

It won't turn the column lock mechanism off...but setting this to "no", will eliminate any fuel cutoff command sent by the BCM to the PCM in case of reported column lock failure (real or otherwise).

As many know, this "feature" was used on one of the GM recalls.

Again, the software can only interact with the PCM...this function is just telling the PCM there is no colomn lock, so that the engine can run without the ok signal from the BCM.

 

Interesting, Tom. So, would a Tech II have the ability to shut down the theft-deterrent system?

Btw, here's the schematic.

 

Not sure, I'm not familiar with it's capabilities.

Thanks, connecting a resistor (of the same value as the key pellet) between the purple/white, and white/black wires leading back to the BCM should effectively eliminate any key-related security codes.

 

what about disabling the whole anti theft system, what would that do?

btw i dont remember th exact code but it was one of these, possibly two of these

B2721 PASS-Key Detection Circuit
B2722 PASS-Key Detection Circuit
B2723 PASS-Key Detection Circuit

ill have to check once i get my car back i was having the car tuned so i was hoping they could get rid of the codes for me