99 tahoe remote start

Chev used Passlock2 for a long time. This system runs on a resistance out of the cylinder itself. There is a small yellow wire coming out of the passlock module that transmits this information to the bcm telling the vehicle a valid key turn was made. This prevents hot wiring but any key that fits will work. Multiple keys are not required for programming. I use DEI 1700G or 457G modules for those. Also the Bypasskit XK01 works or the idatalink ADS-TBSL-GM (or any of numerous other iDatalink stuff) works as well. Most other modules require a manual to know how to set a bunch of jumper switches to the right voltage. I would need an actual model number of the module to offer anything else.

PS: you could try unplugging the module,push the little button on it if there is one, plug it back in, and then start with the key. Might work, might not.

there wanst any buttons or leds or even model numbers on it so i cut it out and put a new one in and it works now thank you very much for replying.  i am new at this so am trying to consume all the info possible