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
3. Disconnect side console wiring
HVAC Blower Motor Does
harness connector (Figure 4,
Not Operate at One or More
Item 1) (WP 0007, Figure 145)
Speeds - Continued
from blower fan switch (Figure 4,
Item 3) (WP 0007, Figure 144).
4. Remove nut (Figure 4, Item 2) and
blower fan switch (Figure 4,
Item 3).
Figure 4. Blower Fan Switch and Side Console Wiring Harness Connector.
0031
5. Rotate blower fan switch to the
lowest speed setting (TM 5-2420-
231-10).
6. Using a digital multimeter, mea-
Resistance 5.0 Ohms or Less -
sure resistance between low
Proceed to step 7.
speed terminal and 12-V supply
Resistance Greater Than 5.0 Ohms -
terminal (WP 0007, Figure 144).
Replace blower fan switch (WP 0172).
Resistance should be 5.0 ohms or
Proceed to Test Step 14.
less.
7. Rotate blower fan switch to the
medium speed setting (TM 5-
2420-231-10).
8. Using a digital multimeter, mea-
Resistance 5.0 Ohms or Less -
sure resistance between medium
Proceed to step 9.
speed terminal and 12-V terminal
Resistance Greater Than 5.0 Ohms -
(WP 0007, Figure 144). Resis-
Replace blower fan switch (WP 0172).
tance should be 5.0 ohms or less.
Proceed to Test Step 14.
9. Rotate blower fan switch to the
highest speed setting (TM 5-2420-
231-10).