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
4. Refrigerant Compressor
Test Step 11. Test A/C On Switch
Will Not Engage - Con-
and Climate Control Panel
tinued
1. Connect rear chassis wiring har-
ness connector FA-C35 (WP
0009, Figure 15) to cab lower wir-
ing harness connector P-C70
(WP 0009, Figure 16) (WP 0188).
2. Disconnect upper cab wiring har-
ness connector R-C48 (WP 0009,
Figure 384) from A/C On switch
(WP 0009, Figure 383) (WP
0293).
3. Turn climate control panel to low
fan speed (TM 5-3805-293-10)
4. Turn battery disconnect and igni-
tion switch to the ON position (TM
5-3805-293-10).
5. Using digital multimeter, test for
Voltage 18 to 26 Volts - Proceed to
voltage between harness connec-
Test Step 13.
tor R-C48 (WP 0009, Figure 384)
Voltage Less Than 18 Volts - Pro-
terminal 2 and machine ground.
ceed to step 6.
Voltage should be 18 to 26 volts.
6. Turn ignition switch and battery
disconnect switch to the OFF
position (TM 5-3805-293-10).
7. Position A/C On switch to the
OFF position (TM 5-3805-293-
10).
8. Using digital multimeter, test for
Continuity - Replace A/C On Switch
continuity between A/C On switch
(WP 0293).
(WP 0009, Figure 383) terminal 2
Proceed to step 13.
and terminal 3.
No Continuity - Proceed to step 9.
There should be no continuity.
9. Position A/C On switch to the ON
position (TM 5-3805-293-10).
10. Using digital multimeter, test for
Resistance 5.0 Ohms or Less - Pro-
continuity between A/C On switch
ceed to step 11.
(WP 0009, Figure 383) terminal 2
Resistance More Than 5.0 Ohms -
and terminal 3.
Replace A/C On Switch (WP 0293).
Resistance should be less than 5.0
Proceed to step 13.
ohms.
0022-40
