TM 5-3805-293-23-2
0022
Table 1. Cab Heating, Air Conditioning, and 12 Volt Power Inverter Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3. Blower Motor Does Not
16. Using digital multimeter, test for
Resistance 5.0 Ohms or Less - Pro-
Turn On In One or More
continuity between HVAC blower
ceed to step 17.
Speeds - Continued
relay socket terminal C18 (WP
Resistance More Than 5.0 Ohms -
0009, Figure 398) and harness
Replace cab lower wiring harness
connector P-C42 (WP 0009, Fig-
(WP 0266).
ure 90).
Proceed to step 19.
Resistance should be less than
5.0 ohms.
17. Disconnect harness connector R-
C22 (WP 0009, Figure 386) from
climate control panel (WP 0009,
Figure 385)
18. Using digital multimeter, test for
Resistance 5.0 Ohms or Less -
continuity between harness con-
Replace climate control panel (WP
nector R-C22 (WP 0009, Figure
0293).
386) terminal 2 and harness con-
Connect cab lower wiring harness
nector R-C3 (WP 0009, Figure
connector P-C42 (WP 0009, Figure
91) terminal 11.
90) to cab upper wiring harness con-
Resistance should be less than
nector R-C3 (WP 0009, Figure 91).
5.0 ohms.
Resistance More Than 5.0 Ohms -
Replace cab upper wiring harness
(WP 0265).
Proceed to step 19.
HVAC Blower Motor Turns ON In
19. Rotate fan speed switch through
Each Speed - Troubleshooting com-
each position (TM 5-3805-293-10)
plete.
and verify HVAC blower turns on
in each position.
HVAC Blower Motor Does Not Turn
ON In One Or More Speeds - Repeat
troubleshooting from beginning.
0022-25
