TM-9-2320-361-24-1 Field Maintenance Manual Volume 1 for M44A2 Series Trucks
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TM 9-2320-361-24-1 0013 00 LIGHTING AND WIPER SYSTEM TROUBLESHOOTING (Contd) 0013 00-23/24 blank MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION WINDSHIELD WIPERS FAIL TO WORK ON HIGH OR LOW SETTING Test 1. Check mechanical linkage for binding or interference. Test 2. Test for voltage at wiper switch. 1. Ensure wiper switch is properly grounded. 2. Disconnect harness from wiper switch. 3. Set multimeter to voltage range that will measure 24 VDC. 4. Turn power accessory switch to ON position. 5. Touch negative lead of multimeter to ground and positive lead to lead 27 of harness receptacle. Test 3. Test for voltage at wiper motor. 1. Ensure wiper motor is properly grounded. 2. Disconnect harness from wiper motor. 3. Turn wiper switch to LOW position. 4. Touch negative lead of multimeter to ground and positive lead to pin 2 of harness receptacle. 5. Turn wiper switch to HIGH position. 6. Touch negative lead of multimeter to ground and positive lead to pin 1 of harness receptacle. Replace damaged links (WP 0240 00). 1. If voltage is present, perform test 3. 2. If voltage is not present, go to WP 0012 00, table 2, malfunction 1, test 3, to check operation of power accessory switch. 1. If properly grounded, go to step 2. 2. If wiper motor is not properly grounded, clean dirt or corrosion from contact end and recheck continuity. 1. If voltage is present, go to step 5. 2. If voltage is not present, replace wiper switch (WP 0240 00). 1. If voltage is present, replace wiper motor (WP 0240 00). 2. If voltage is not present, replace wiper switch (WP 0240 00). Table 5. Electrical Wiper System Troubleshooting Procedures. END OF WORK PACKAGE