Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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If this is the immobilizer that is keeping the vehicle from starting usually this cannot be bypassed manually.If the horn is going off with this issue here as well you might have a fault with the door latch sending an incorrect signal that a door is locked when it is actually unlocked which can cause the horn issue as well as the no start in some cases.Most common is a fault with the drivers door latch itself as this is the door that is used the most.
I would have the fault codes read out/checked to see what codes are set using a scan tool that will plug in and communicate with all computers.Once this has been done any codes set need diagnosed and repaired.
You can try a bypass kit for your alarm from http://newrockies.com/ as this will bypass the immobilizer all together.It comes with easy to follow instructions on how to install it as well as customer support if needed.
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