There is no need for an interface module to install a security system. If you install a remote starter, you will need to interface with the passlock system. The only module available is the PLXR, and honestly it's unstable in my experience I would recommend using relays and resistors to bypass. Seems to be much more reliable in my experience. If you do add an aftermarket system, make sure not to use the OEM remotes anymore put them in the house. The OEM remotes will arm the factory alarm, and you can't shut it down from the aftermarket system.
Mike
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