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COLD START SYSTEM WILL NOT OPERATE. cont'd -680640285
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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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DRIVER SIDE WINDSHIELD HEATER WILL NOT OPERATE. cont'd -680640287
TM
5-2420-224-20-1
Table 3-5. Troubleshooting (Cont)
Malfunction
Test or Inspection
Corrective Action
ELECTRICAL SYSTEM (CONT)
48.
DRIVER SIDE WINDSHIELD HEATER WILL NOT OPERATE.
NOTE
Refer to wiring diagram (page 3-159) for all wiring repair steps.
Step 1. Pull windshield heater control switch 1 (1) and verify lamp (2) is lit.
If lamp is lit, go to step 4.
If lamp is not lit, go to step 2.
Step 2. Check for +24 VDC between wire 623 (3) and ground at windshield heater
control switch 1 (1).
If +24 VDC is present, replace lamp (2) and go to step 4.
If +24 VDC is not present, go to step 3.
Step 3. Disconnect connector N (4) and check for +24 VDC between wire 623 (3)
and ground.
If +24 VDC is present, repair wiring 623 between connector N
and windshield heater control switch 1.
If +24 VDC is not present, repair wiring 623 between
connector N and cab heater.
Step 4. Check for +24 VDC between wire 624 (5) and ground at windshield heater
control switch 1 (1).
If +24 VDC is not present, repace windshield heater control
switch 1 (page 4-139).
If +24 VDC is present, go to step 5.
Step 5. Disconnect connector N (4) and check for +24 VDC between wire 624 (5)
and ground.
If +24 VDC is present, repair wiring 624 between connector N
and windshield heater control switch 1.
If +24 VDC is not present, reconnect connector N and go to
step 6.
Step 6. Check for +24 VDC between wire 624 (5) and ground at relay K5 (6).
If +24 VDC is present, repair wiring 624 between connector N
and relay K5.
If +24 VDC is not present, go to step 7.
3-156

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