It is a common practice at the dealer level to disconect the battery and touch the battery cables together to reset the computers. It is usually done when problems are encountered during software downloads, and to wake up sleeping nodes. It will damage nothing. Another common practice is to simply pull the fuse to the troublesome control module and reinstall after about 5 minutes. There were problems with steering wheel modules which caused turn signal failure. Removing and reinstelling the fuse would get them working most of the time till the software upgrade could be installed. There are numerous S-80 software upgrades available for cold start, idle surge, steering wheel module, trans problems, climate control problems.