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
10. Using a digital multimeter, test for
HVAC Blower Motor Does
Continuity - Replace cab wiring
continuity between cab wiring
Not Operate at One or More
harness (WP 0181).
harness connector (WP 0007,
Speeds - Continued
Install blower fan switch (WP 0172).
Figure 148) terminal C and
Install new blower fuse (TM 5-2420-
machine ground. There should be
231-10).
no continuity.
Proceed to Test Step 14.
No Continuity - Replace HVAC blower
motor (WP 0349).
Install blower fan switch (WP 0172).
Install new blower fuse (TM 5-2420-
231-10).
Proceed to Test Step 14.
Test Step 13. Test A/C Compressor
12-Volt Supply Circuit for a Short.
1. Remove front instrument panel
right-side cover (WP 0176)
2. Disconnect side options wiring har-
ness connector (WP 0007, Figure
44) from side console wiring har-
ness connector (WP 0007, Figure
45) (WP 0255).
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 45) terminal C 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 4.
4. Disconnect side console wiring
harness connector (WP 0007, Fig-
ure 28) from instrument cluster
(WP 0007, Figure 29) (WP 0177).
5. 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 45) 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 6.
6. Disconnect side options wiring har-
ness connector (WP 0007,
Figure 43) from chassis options
wiring harness connector (WP
0007, Figure 42) (WP 0255).
0031-17
