TM 5-2410-240-23-1
0021
Table 1. Cab Troubleshooting Without Codes. - Continued.
0021
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. HVAC Blower Motor Does Not
Test Step 5.
Function in One or More Speeds
1. Turn ignition switch and bat-
- Continued
tery disconnect switch to OFF
position (TM 5-2410-240-10).
2. Disconnect harness connec-
tor C-C74 (WP 0018, Figure
45) from AC-C4 (WP 0018,
Figure 272).
3. Turn battery disconnect switch
and ignition switch to ON posi-
tion (TM 5-2410-240-10).
4. Turn blower fan switch to
medium high fan speed (TM 5-
2410-240-10).
5. Using digital multimeter, mea-
Voltage Less Than Specified
sure for voltage (WP 0283)
Range - Proceed to step 6.
between harness connector
Voltage Within Specified Range
C-C74 (WP 0018, Figure 45)
- Proceed to step 25.
terminal 2 and terminal 4.
There should be approximately 18
to 26 volts.
6. Turn ignition switch and bat-
tery disconnect switch to OFF
position (TM 5-2410-240-10).
7. Disconnect harness connec-
tor C-C72 (WP 0018, Figure
43) from medium-high fan
relay (WP 0018, Figure 50).
8. Using digital multimeter, test
No Continuity - Replace lower
for continuity (WP 0283)
cab wiring harness (WP 0228).
between C-C74 (WP 0018,
Ensure all harness connectors are
Figure 45) terminal 2 and har-
reconnected. Verify proper opera-
ness connector C-C72 (WP
tion of machine (TM 5-2410-240-
0018, Figure 43) terminal 4.
10).
Continuity - Proceed to step 9.
9. Disconnect harness connec-
tor C-C73 (WP 0018, Figure
44) from high fan relay (WP
0018, Figure 49).
10. Connect harness connector C-
C72 (WP 0018, Figure 43) to
high fan relay (WP 0018, Fig-
ure 49).
0021-25