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DRIVER SIDE WINDSHIELD HEATER WILL NOT OPERATE. cont'd -680640289
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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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PASSENGER SIDE WINDSHIELD HEATER WILL NOT OPERATE. cont'd -680640291
TM
5-2420-224-20-1
Table 3-5. Troubleshooting (Cont)
Malfunction
Test or Inspection
Corrective Action
ELECTRICAL SYSTEM (CONT)
49. PASSENGER SIDE WINDSHIELD HEATER WILL NOT OPERATE.
NOTE
Make sure driver side windshield heater is turned on first.
If not, passenger side
windshield heater will not operate.
Perform the following steps only after proper operation of driver side windshield
heater has been verified.
Refer to wiring diagram (page 3-162) for ail wiring repair steps.
Step 1. Pull windshield heater control switch 1 (1) and then switch 2 (2) and verify
lamp (3) is lit.
If lamp is lit, go to step 3.
If lamp is not lit, go to step 2.
Step 2. Check for +24 VDC between wire 627 (4) and ground at windshield heater
control switch 2 (2).
If +24 VDC is not present, repair wiring 627 between
windshield heater control switch 1 and switch 2.
If +24 VDC is present, replace lamp (3) and go to step 3.
Step 3. Check for +24 VDC between wire 625 (5) and ground at windshield heater
control switch 2 (2).
If +24 VDC is not present, replace windshield heater control
switch 2 (page 4-139).
If +24 VDC is present, go to step 4.
Step 4. Disconnect connector N (6) and check for +24 VDC between wire 625 (5)
and ground.
If +24 VDC is not present, repair wiring 625 between
windshield heater control switch 2 and connector N.
If +24 VDC is present, reconnect connector N and go to step 5.
Step 5. Check for +24 VDC between wire 625 (5) and ground at relay K4 (7).
If +24 VDC is not present, repair wiring 625 between
connector N and relay K4.
If
+24 VDC is present, go to step 6.
Step 6. Check for +24 VDC between wire 621 (8) and ground at relay K4 (7).
If
+24 VDC is not present, replace relay K4.
If
+24 VDC is present, go to step 7.

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