DRIVER SIDE WINDSHIELD HEATER WILL NOT OPERATE.

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.

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