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
9. Disconnect cab lower wiring har-
Turn On In One or More
ness connector A (WP 0009, Fig-
Speeds - Continued
ure 402) from blower resistor
terminal A (WP 0009, Figure 402).
10. Using digital multimeter, test for
Resistance 5.0 Ohms or Less - Pro-
continuity between harness con-
ceed to step 11.
nector CM-C1 (WP 0009, Figure
Resistance More Than 5.0 Ohms -
272) terminal 4 and harness con-
Replace cab lower wiring harness
nector A (WP 0009, Figure 402).
(WP 0266).
Resistance should be less than
Proceed to step 15.
5.0 ohms.
11. Connect harness connector P-
C16 (WP 0009, Figure 273) to
harness connector CM-C1 (WP
0009, Figure 272) (WP 0266).
12. Turn battery disconnect switch
and ignition switch to the ON posi-
tion (TM 5-3805-293-10).
13. Turn fan speed switch to the low
speed setting.
14. Using digital multimeter, test for
Voltage Between 18 to 26 Volts -
voltage between harness connec-
Replace blower resistor (WP 0294).
tor A (WP 0009, Figure 402) and
Voltage Less Than 18 Volts -
machine ground.
Replace climate control panel (WP
Voltage should be 18 to 26 volts.
0293).
Proceed to step 15.
HVAC Blower Motor Turns ON In
15. 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.
Test Step 4. Test Climate Control
Panel and Medium Speed Fan Cir-
cuit.
1. Turn ignition switch and battery
disconnect to the OFF position
(TM 5-3805-293-10).
2. Disconnect cab upper wiring har-
ness connector R-C22 (WP 0009,
Figure 386) from climate control
panel (WP 0009, Figure 385) (WP
0293).
0022-19