TM 5-3805-298-23-2
0142
Table 1. Rear Window Defroster Does Not Operate - Continued.
0142
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3. Disconnect connector C-C13
Rear Window Defroster
(WP 0012, Figure 25) from
Does Not Operate -
Transmission ECM J2.
Continued
4. Install a jumper wire between
terminal 13 and terminal 29 of
connector C-C13 (WP 0012,
Figure 25).
5. Using digital multimeter
Resistance 5.0 Ohms or Less
(WP 0174), measure resistance
Proceed to step 6.
between C-C29 (WP 0012,
Resistance Greater Than 5.0 Ohms
Figure 208) terminal 5 and C-C39
Replace lower cab wiring harness
(WP 0012, Figure 210) terminal 3.
(WP 0291).
Proceed to Test Step 12.
Resistance 5.0 Ohms or Less
6. Using digital multimeter
Replace transmission ECM (WP 0266).
(WP 0174), measure resistance
between C-C39 (WP 0012,
Proceed to Test Step 12.
Figure 210) terminal 2 and ground.
Resistance Greater Than 5.0 Ohms
Replace lower cab wiring harness
(WP 0291).
Proceed to Test Step 12.
Test Step 9. Test for Rear Window
Def Fuse Replacement.
1. Turn battery disconnect switch and
ignition switch to ON position
(TM 5-3805-298-10).
2. Press rear defrost switch to on
(momentary) (TM 5-3805-298-10).
3. Observe operation of rear defrost
Rear Defrost Switch Indicator Lights
switch indicator (TM 5-3805-298-
Proceed to Test Step 12.
10).
Rear Defrost Switch Indicator Does
Not Light Proceed to step 4.
4. Turn ignition switch and battery
disconnect switch to OFF position
(TM 5-3805-298-10).
5. Remove rear window DEF fuse
from fuse panel (TM 5-3805-298-
10).
6. Using digital multimeter
Resistance 5.0 Ohms or Less Install
(WP 0174), measure resistance
rear window DEF fuse (WP 0012,
between terminals of rear window
Figure 44, Item 8) and proceed to Test
DEF fuse.
Step 5.
Resistance Greater Than 5.0 Ohms
Proceed to Test Step 10.
0142-5
