TM 9-2320-209-20-3-4 23-27. VAN BODY PERSONNEL HEATER SWITCHES REPAIR (TRUCKS M109A2 AND M109A3). TOOLS: Flat-tip screwdriver SUPPLIES: Tags PERSONNEL: One EQUIPMENT CONDITION: Truck parked, engine off, handbrake set. a. Preliminary Procedures. (1) Disconnect battery ground cable. Refer to Part 1, para 7-58. (2) If connected, unplug 115-volt power line from entrance receptacle. Refer to TM 9-2320-209-10. b. Removal. FRAME 1 1. 2. 3. 4. GO Unscrew and unplug electrical connector (1). Unplug electrical plug (2). Using screwdriver, turn screw (3) 1/4 turn to left and open door (4). Using screwdriver, unscrew and take out eight screws (5). TO FRAME 2 23-95