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
11. Connect harness connector P-
Turn On In One or More
C16 (WP 0009, Figure 273) to
Speeds - Continued
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
medium speed setting.
14. Using digital multimeter, test for
Voltage 18 to 26 Volts - Replace
voltage between harness connec-
blower resistor (WP 0294).
tor B (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.
15. Rotate fan speed switch through
HVAC Blower Motor Turns ON In
each position (TM 5-3805-293-10)
Each Speed - Troubleshooting com-
and verify HVAC blower turns on
plete.
in each position.
HVAC Blower Motor Does Not Turn
ON In One Or More Speeds - Repeat
troubleshooting from beginning.
Test Step 5. Test Climate Control
Panel and Medium High Speed Fan
Circuit.
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).
3. Disconnect cab upper wiring har-
ness connector R-C1 (WP 0009,
Figure 33) from cab lower wiring
harness connector P-C3 (WP
0009, Figure 34) (WP 0266).
4. Using digital multimeter, test for
Resistance 5.0 Ohms or Less - Pro-
continuity between harness con-
ceed to step 5.
nector R-C22 (WP 0009, Figure
Resistance More Than 5.0 Ohms -
386) terminal 3 and harness con-
Replace cab upper wiring harness
nector R-C1 (WP 0009, Figure
(WP 0265).
33) terminal 47.
Proceed to step 15.
Resistance should be less than
5.0 ohms.
0022-21
