TM 5-3805-291-23-1
TROUBLESHOOTING WITHOUT A DIAGNOSTIC CODE - CONTINUED
0008 00
Table 2. Electrical System Troubleshooting - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
8. Check AC compressor clutch power
1. If battery voltage is present, go to Test
17. AC Compressor Does Not
circuit.
9.
Run (Blower Operates
(a) Jumper wire remains in place.
2. If battery voltage is not present, replace
Correctly) - Continued.
(b) Connect wiring harness to AC
AC compressor (WP 0221 00).
compressor clutch (WP 0221 00).
(c) Battery disconnect and engine
start switches remain in ON
position (TM 5-3805-291-10).
(d) Turn AC/heater switch to AC ON
position.
(e) Measure voltage at back of
connector between AC
compressor clutch wiring harness
pin 2, wire 522 (WH), and ground.
9. Check AC compressor clutch ground
1. If battery voltage is present, go to Test
circuit.
10.
(a) Jumper wire remains in place.
2. If battery voltage is not present, there
(b) Battery disconnect and engine
is an open circuit between thermostatic
start switches remain in ON
switch and compressor. Replace wiring
position (TM 5-3805-291-10).
harness in question (WP 0195 00 thru
(c) AC/heater switch remains in AC
WP 0201 00).
ON position.
(d) Measure voltage between
thermostatic switch wiring
harness, wire 522 (WH), and
ground.
10. Check thermostatic switch ground
1. If continuity is present, replace
circuit.
thermostatic switch (WP 0220 00).
(a) Battery disconnect switch remains 2. If continuity is not present, there is an
in ON position.
open thermostatic switch ground
(b) Check continuity between
circuit. Replace wiring harness in
thermostatic switch wiring
question (WP 0195 00 thru WP 0201
harness, wire 200 (BK), and
00).
ground.
18. One or More Blower Motor 1. Determine condition.
1. If only high speed is inoperative, go to
Test 3.
Speeds Are Inoperative.
2. If only medium speed is inoperative, go
to Test 5.
3. If only low speed is inoperative, go to
Test 6.
4. If only medium and low speeds are
inoperative, go to Test 4.
5. If all blower speeds are inoperative,
reset HVAC blower breaker (TM 5-
3805-291-10). If problem still exists,
go to Test 2.
