The "CPU" is an electronics module that controls a number of specific electronics within the vehicle.  A short list of controlled electronics include:  horn, turn signals, hazards.  The CPU is located in the driver's side kick panel; you'll need to remove the plastic kick panel itself via three plastic push clips.  The CPU is secured by a single 10mm nut.  Three wiring plugs exit the black plastic housing - one from the center, and two from the bottom.  The wiring plugs need to be removed to remove the CPU itself.  Once the CPU is loose, you'll need to remove a few screws and pry some of the panels off.  Once everything is open, concentrate on the main board where the largest plug connects.  These cold solder joints are typically cracked, and resoldering them fixes the problems 99% of the time.

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