TM 5-3805-298-23-2
0142
Table 1. Rear Window Defroster Does Not Operate - Continued.
0142
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Test Step 10. Test for Faulty
Rear Window Defroster
Defroster Relay.
Does Not Operate -
1. Remove defroster relay
Continued
(WP 0364).
2. Using digital multimeter
Resistance 288 Ohms to 396 Ohms
(WP 0174), measure resistance
Proceed to Test Step 11.
between defroster relay (WP 0012,
Resistance Less Than 288 Ohms
Figure 209) terminal 86 and
Replace defroster relay (WP 0364).
terminal 85.
Proceed to Test Step 12.
Test Step 11. Test for Shorted Wiring
Harness.
1. Disconnect connector G-C3
(WP 0012, Figure 139) from
connector C-C24 (WP 0012,
Figure 140).
2. Disconnect terminal 1 and terminal
2 from rear window defroster
(WP 0012, Figure 207).
3. Using digital multimeter
Continuity Replace upper cab wiring
(WP 0174), test for continuity
harness (WP 0292).
between connector G-C3
Proceed to Test Step 12.
(WP 0012, Figure 139) terminal 9
No Continuity Replace lower cab
and ground.
wiring harness (WP 0291).
Proceed to Test Step 12.
Test Step 12. Verify Malfunction Is
Resolved.
1. Ensure all harness connectors are
connected.
2. Install transmission ECM cover
(WP 0266).
3. Install left lower cab access panels
(WP 0347).
4. Install defroster relay (WP 0364).
5. Turn battery disconnect switch and
ignition switch to ON position
(TM 5-3805-298-10).
6. Press rear defrost switch to on
(momentary) (TM 5-3805-298-10).
7. Observe operation of front work
Rear Window Defroster Operates
lights (TM 5-3805-298-10).
Troubleshooting complete.
Rear Window Defroster Does Not
Operate Repeat troubleshooting
from the beginning.
END OF WORK PACKAGE
0142-6
