TM 10-3930-659-20 Table 4-2.  Electrical Troubleshooting (Con't). MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Step 2.  Check accessory relay within heater circuit of load center wiring harness for voltage and continuity (see paragraphs 2-27 and 6-73). Replace damaged accessory relay (see paragraph 6-12). Step 3.  Check heater blower control for continuity (see paragraph 2-27). Replace damaged heater blower control (see paragraph 16-4). Step 4.  Disconnect left panel wiring harness at heater blower motor and test for 24 v at socket (see paragraph 2-27). Replace damaged heater blower motor (see paragraph 16-12). Step 5.  Check wiring harnesses within heater circuits for continuity (see paragraphs 2-27 and 6-73). Repair or replace damaged connector or wire (see paragraph 2-28). 24.  DEFROSTER BLOWER MOTOR IS NOT WORKING. Step 1.  Check defroster fan fuse and defroster circuit fuse for continuity (see paragraph 2-27). Replace damaged 10 amp fuse (see paragraph 6-13). Replace damaged 15 amp fuse (see paragraph 6-13). Step 2.  Check accessory relay within defroster circuit of load center wiring harness for voltage and continuity (see paragraphs 2-27 and 6-73). Replace damaged accessory relay (see paragraph 6-12). Step 3.  Check defroster blower control for continuity (see paragraph 2-27). Replace damaged defroster blower control (see paragraph 16-4). Step 4.  Disconnect left panel wiring harness at defroster blower motor and test for 24 v at socket (see paragraph 2- 27). Replace damaged defroster blower motor (see paragraph 16-2). Step 5.  Check wiring harnesses within defroster circuits for continuity (see paragraphs 2-27 and 6-73). Repair or replace damaged connectors or wires (see paragraph 2-28). 25.  FRONT WINDSHIELD OR REAR WINDOW WIPER MOTOR IS NOT WORKING. Step 1.  Check front windshield/rear window wiper motor and washer fuse for continuity (see paragraph 2-27). Replace damaged 10 amp fuse (see paragraph 6-13). 4-35