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
10. Connect cab upper wiring har-
Turn On In One or More
ness connector R-C22 (WP 0009,
Speeds - Continued
Figure 386) to climate control
panel (WP 0009, Figure 385) (WP
0293).
11. Disconnect harness connector
CM-T1 from HVAC blower motor
(WP 0009, Figure 274) (WP
0266).
12. Turn battery disconnect switch
and ignition switch to the ON posi-
tion (TM 5-3805-293-10).
13. Rotate fan speed switch to the
high speed setting (TM 5-3805-
293-10).
14. Using digital multimeter, test for
Voltage 18 to 26 Volts - Proceed to
voltage between harness connec-
step 15.
tor CM-T1 (WP 0009, Figure 274)
Voltage Less Than 18 Volts -
and machine ground.
Replace cab lower wiring harness
Voltage should be 18 to 26 volts.
(WP 0266).
Proceed to step 18.
15. Turn ignition switch and battery
disconnect to the OFF position
(TM 5-3805-293-10).
16. Disconnect harness connector
CM-T2 from HVAC blower motor
(WP 0009, Figure 274) (WP
0266).
17. Using digital multimeter, test for
Resistance 5.0 Ohms or Less -
continuity between harness con-
Replace HVAC blower motor (WP
nector CM-T2 (WP 0009, Figure
0294).
274) and machine ground.
Proceed to step 18.
Resistance should be less than
Resistance More Than 5.0 Ohms -
5.0 ohms.
Verify cab ground (WP 0009, Figure
65) is clean and tight. If cab ground is
OK, replace cab lower wiring harness
(WP 0266).
Proceed to step 18.
HVAC Blower Motor Turns ON In
18. 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.
0022-17