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
1. Heater Does Not Blow
3.
Using digital multimeter, test for
Resistance 5.0 Ohms or Less - Pro-
Warm When Tempera-
continuity between harness con-
ceed to step 4.
ture Control Panel Is Set
nector R-C22 (WP 0009, Figure
Resistance More Than 5.0 Ohms -
On Maximum Heat - Con-
386) terminal 11 and harness con-
Replace cab upper wiring harness
tinued
nector P-C3 (WP 0009, Figure 34)
(WP 0265).
terminal 41.
Connect harness connector CM-C1
Resistance should be less than
(WP 0009, Figure 272) to harness
5.0 ohms.
connector P-C16 (WP 0009, Figure
273).
Connect cab lower wiring harness
harness connector CM-C7 (WP 0009,
Figure 271) to water valve actuator
(WP 0009, Figure 270) (WP 0294).
Proceed to step 15.
4. Disconnect harness connector
CM-C1 (WP 0009, Figure 272)
from harness connector P-C16
(WP 0009, Figure 273).
5. Using digital multimeter, test for
Resistance 5.0 Ohms or Less - Pro-
continuity between harness con-
ceed to step 6.
nector R-C1 (WP 0009, Figure
Resistance More Than 5.0 Ohms -
32) terminal 41 and harness con-
Replace cab lower wiring harness
nector P-C16 (WP 0009, Figure
(WP 0266).
273) terminal 3.
Connect upper cab wiring harness
Resistance should be less than
connector R-C22 (WP 0009, Figure
5.0 ohms.
386) to HVAC control panel (WP
0009, Figure 385) (WP 0265).
Proceed to step 15.
6. Using digital multimeter, test for
Resistance 5.0 Ohms or Less - Pro-
continuity between harness con-
ceed to step 7.
nector CM-C1 (WP 0009, Figure
Resistance More Than 5.0 Ohms -
272) terminal 3 and harness con-
Replace cab lower wiring harness
nector CM-C7 (WP 0009, Figure
(WP 0266).
271) terminal D
Connect upper cab wiring harness
Resistance should be less than
connector R-C22 (WP 0009, Figure
5.0 ohms.
386) to HVAC control panel (WP
0009, Figure 385) (WP 0265).
7. Connect upper cab wiring har-
ness connector R-C22 (WP 0009,
Figure 386) to HVAC control
panel (WP 0009, Figure 385) (WP
0265).
0022-8