Couple different things going on, lets go with the cruise first, if brake lights don't work cruise wont either, this is usually the green wire at the multifunction switch, see if it is secure, and both male and female pins are ok, if OK suspect the switch.
The Lights and door problem can be as simple as buy a can of brakekleen and a can of spray white lithium grease, spray the latch area, thats the claw in the door where it closes, spray liberally with brakleen, open and close the door 5-6 times, repeat, then spray with the white lube, open and close the door 5-6 times. Reapeat on all doors...Fix these first and report back...
If this gets into the LCM you will need a scan tool that can read and command the different modules...
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Friday, March 14th, 2008 AT 3:42 PM