TM 5-2420-231-23-1
0031
Table 1. Heating, Ventilation, and A/C (HVAC) Blower Motor Does Not
Operate at One or More Speeds - Continued.
031
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. Using a digital multimeter, test for
HVAC Blower Motor Does
Continuity - Replace side console
continuity between side console
Not Operate at One or More
wiring harness (WP 0170).
wiring harness connector (WP
Speeds - Continued
Install blower fan switch (WP 0172).
0007, Figure 145) low-speed fan
Install new blower fuse (TM 5-2420-
circuit terminal and machine
231-10).
ground. There should be no conti-
Proceed to Test Step 14.
nuity.
No Continuity - Proceed to step 3.
3. Using a digital multimeter, test for
Continuity - Replace side console
continuity between side console
wiring harness (WP 0170).
wiring harness connector (WP
Install blower fan switch (WP 0172).
0007, Figure 145) medium-speed
Install new blower fuse (TM 5-2420-
fan circuit terminal and machine
231-10).
ground. There should be no conti-
Proceed to Test Step 14.
nuity.
No Continuity - Proceed to step 4.
Install blower fan switch (WP 0172).
4. Using a digital multimeter, test for
Continuity - Replace side console
continuity between side console
wiring harness (WP 0170).
wiring harness connector (WP
Install blower fan switch (WP 0172).
0007, Figure 145) high-speed fan
Install new blower fuse (TM 5-2420-
circuit terminal and machine
231-10).
ground. There should be no conti-
Proceed to Test Step 14.
nuity.
No Continuity - Proceed to step 7.
5. Remove headliner and right-side
cover (WP 0346).
6. Remove right blower duct (WP
0350).
7. Disconnect cab wiring harness
connector (WP 0007, Figure 148)
from blower motor wiring harness
connector (WP 0007, Figure 149)
(WP 0349).
8. Using a digital multimeter, test for
Continuity - Replace cab wiring
continuity between cab wiring har-
harness (WP 0181).
ness connector (WP 0007, Figure
Install blower fan switch (WP 0172).
148) terminal A and machine
Install new blower fuse (TM 5-2420-
ground. There should be no conti-
231-10).
nuity.
Proceed to Test Step 14.
No Continuity - Proceed to step 9.
9. Using a digital multimeter, test for
Continuity - Replace cab wiring
continuity between cab wiring
harness (WP 0181).
harness connector (WP 0007,
Install blower fan switch (WP 0172).
Figure 148) terminal B and
Install new blower fuse (TM 5-2420-
machine ground. There should be
231-10).
no continuity.
Proceed to Test Step 14.
No Continuity - Proceed to step 10.
0031-16
