It takes about 30 seconds to put in. no big deal. Basically the pressure sensor in the end of the master cylinder (or down in the proportioning valve in a few vehicles) has a full time hot lead into it. The switch is used to shut off the cruise in the event your brake light switch fails (redundant system). The full time hot lead can short if the sensor leaks internally, causing brake fluid to short in the connector and then in turn ignite. The recall is a fused harnass so as to keep the circuit from starting a fire if the sensor should leak. If your sensor is already leaking then they replace that too. I had one that had a leaking sensor that was seized and destroyed the threads, thereby getting that customer a master cylinder and brake bleed as well (took much longer than the 30 seconds mentioned above).
call and make an appointment at the local stealership and they will check your sensor and put the fused jumper harness in, all it costs you is time. An appointment will limit the amout of time you wait.
punk