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going off memory from several years ago -
the trim around the radio/climate control simply snaps off -
the radio and climate control are held in by two spring clips on the sides
and are removed as a single unit - THEN you separate them -
regarding the "security code" - YOU are correct -
the first time the radio was turned on - it "recorded" the VIN number of your car -
since then - EVERY time the radio is turned on -
it compares the stored VIN with the actual VIN -
if it matches - the radio plays -
if they do NOT match - the TheftLoc system locks the radio -
and requires a TECH2 scan tool to unlock it -
HOWEVER -
if you have the navigation radio - you MIGHT have a problem if you unplug it -
there is a small button battery in the NAV unit that keeps the NAV system software in memory -
IF/when this button battery goes dead - usually after 10 to 15 years - and you unplug the radio - the software gets erased -
you MUST have the NAV system software disc to re-install the software -
without this disc - the NAV radio will never work again -