TM 9-2320-364-102-16 2-3. LOCATION AND USE OF CONTROLS AND INDICATORS(CONT).Figure 2-5. CTIS Controller Controls and Indicators CONT.KeyControl or IndicatorFunctionNOTE1Rotary Selection Switch(CTIS) - (Continued)· The rotatory selection switch will still operate the drive line functions even if the CTIS ON/OFF switch is set to OFF.· If it becomes necessary to disable theCTIS, the tires will have to be manuallyinflated or deflated.A green LED at each of the four positions willstay lit continuously if the CTIS and drivelinelockup are in proper operating mode. Slowflashing indicates acceptable change. Rapidflashing indicates unacceptable operatingparameters and requires corrective action bythe operator.