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You are caught in a loop most likely caused by a failed microdrive. Search Garmin 2620 cornice for a thread that is likely to provide the information about the failure you are experiencing. In short, if it is the Cornice drive that has failed you will find it very difficult to repair, if not impossible depending on your level of expertise and ability to find a used part for repair as the drives needed are no longer manufactured or readily available.
I am assuming you want to calibrate the touch screen. Press MENU, click DISPLAY, Press find, press find, follow instructions on screen. You can also hold MENU and FIND at startup and a diagnostic screen will start up, pressing menu repeatedly while on this screen will give you an opportunity to calibrate the screen. If you are looking for a solution on how to do something else, please post additional information and I will do my best to assist.
1.Chock wheels.2.Drain the engine coolant. Refer to Engine Cooling System.3.Discharge and recover the refrigerant from the A/C system. Refer to Recovery/Evacuating/Charging in this section.4.Remove the dash panel. Refer to Body.5.Remove the Blower/Evaporator unit. Refer to Blower/Evaporator Unit in this section.6.Disconnect the low pressure line from the evaporator outlet on the bulkhead.7.Disconnect the high pressure line from the evaporator inlet on the bulkhead.8.Disconnect the heater return hose from the heater core outlet tube connection.9.Disconnect the heater inlet hose from the heater core inlet tube connection.10.Disconnect the fresh air/recirculation control cable from the blower housing unit inlet duct.11.Disconnect five connectors at the bottom of the blower housing unit.12.Pull carpeting away from bulkhead to gain access to the hole cover plate.13.Remove the four nuts retaining the hole cover plate.14.Remove the hole cover plate.15.Remove two mounting bolts at the top of the blower housing unit.16.Remove two nuts attaching the bottom of the blower housing unit to the bulkhead mounting studs.17.Remove the blower unit from the vehicle.18.Remove the temperature control cable from the heater unit servo.19.Remove the two nuts from the mounting studs at the bottom of the heater unit.20.Remove the top nut holding the heater unit to the bulkhead to the bulkhead mounting stud.21.Remove the heater unit.Regards,Jeep Brainy
1.Drain the engine coolant. Refer to Engine Cooling System.2.Discharge and recover the refrigerant from the A／C system. Refer to “Recovery／Evacuating／Charging” in this section.3.Remove the dash panel. Refer Body.4.Remove the blower/ evaporator unit. Refer to “Blower／Evaporator unit” in this section.5.Disconnect the low pressure line from the evaporator outlet on the bulkhead.6.Disconnect the high pressure line from the evaporator inlet on the bulkhead.7.Disconnect the heater return hose from the heater core outlet tube connection.8.Disconnect the heater inlet hose from the heater core inlet tube connection.
9.Disconnect the fresh air／recirculation control cable from the blower housing unit inlet duct.10.Disconnect five connectors at the bottom of the blower housing unit.11.Pull carpeting away from bulkhead to gain access to the hole cover plate.12.Remove the four nuts retaining the hole cover plate.13.Remove the hole cover plate.14.Remove two mounting bolts at the top of the blower housing unit.15.Remove two nuts attaching the bottom of the blower housing unit to the bulkhead mounting studs.16.Remove the blower unit from the vehicle.17.Remove the temperature control cable from the heater unit servo.18.Remove the two nuts from the mounting studs at the bottom of the heater unit.19.Remove the top nut holding the heater unit to the bulkhead to the bulkhead mounting studs. 20.Remove the heater unit.