556u Immobilizer installed on 200 Silverado

Hello all. I have utilized the awesome forums and pictorals to install my viper 4706v remote start into my 2000 Silverado. I am having an issue I believe with the immobilizer. The truck will start than shuts off immediately. I have done the following troubleshooting;
1. Reprogrammed the viper to voltage sense instead of virtual tach.
2. left key in the ignition and tried to remote start
Neither have solved the problem. I do have to reset the Passlock 2 every time i try to remote start which leads to beleive that it is my immobilizer.
I have the 556u wired as such;
Key switch
YEL wire - BLK/WHT antenna wire (key side), BLK antenna wire (transceiver)
ORG/BLK - BLK/RD antenna wire
RED / WHT - not used

Please let me know if i am correct with my wiring and if i am in the right direction with my troubleshooting.
Thanks!!


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Bruce Coolbaugh

Your 2000 Silverado has the Passlock2 immobilizer system.  It does not have a transponder based system and there is
no chip in the key.  The 556UW bypass module is for transponder chip based systems and will not work for your
truck.  I would recommend the Fortin Passlock-SL2-V2 or ADS iDatalink ADS TBSL PL modules.  Both come
pre-loaded from the factory but you will have to go W2W like you are with the 556UW.  The ADS TBSL PL is slightly
easier to use, install and program.

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Soldering is fun!

That makes sense. thanks for your input. I will purchase one of your recommendations.

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Bruce Coolbaugh