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HORN WILL NOT SOUND. cont'd
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TM-5-2420-224-20-1 Tractor Wheeled 4x4 DED Small Emplacement Excavator (SEE) and High Mobility Material Handler (HMMH) Manual
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WINDSHIELD WASHER PUMP WILL NOT OPERATE. cont'd
TM 5-2420-224-20-1
Table 3-5. Troubleshooting (Cont)
Malfunction
Test or Inspection
Corrective Action
ELECTRICAL SYSTEM (CONT)
34. WINDSHIELD WASHER PUMP WILL NOT OPERATE.
NOTE
Vehicle MASTER disconnect switch must be ON, ignition switch set to ON, and
windshield wiper/washer switch engaged. Failure to do so will cause erroneous
results.
Refer to wiring diagram for all wiring repair steps.
Check for +24 VDC between wire 638 (1) and ground at windshield washer
Step 1.
pump connector (2).
If +24 VDC is present, replace windshield washer pump
(page 4-484).
If +24 VDC is not present, go to step 2.
Disconnect connector F (3) and check for +24 VDC between wire 638 (1)
Step 2.
and ground.
If +24 VDC is present, repair wiring 638 between connector F
and windshield washer pump.
If +24 VDC is not present, reconnect connector F and go to
step 3.
Remove defroster nozzle (4) and hose (5).
Step 3.
Remove knob (6), nut (7), and windshield wiper/washer switch (8) from
Step 4.
dashboard (9).
Step 5.
Check for +24 VDC between wire 638 (1) and ground at windshield
wiper/washer switch (8).
If +24 VDC is not present, replace windshield wiper/washer
switch (page 4-132).
If +24 VDC is present, repair wiring 638 between windshield
wiper/washer switch and connector F.
3-126

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