i want to disconnect the anti-theft system
The anti theft is wired through your PCM,and has to be active for your car to run,
This is a common problem, these sites are worth looking into. http://www.diy-gm-security.com/ & http://newrockies.com/
Search GMC Jimmy Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
GMC Jimmy Experts