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
5. Check for power to AC and heater
1. If battery voltage is not present, there
17. AC Compressor Does Not
select switch.
is an open circuit between switch and
Run (Blower Operates
(a) Disconnect wiring harness from
HVAC breaker. Replace wiring
Correctly) - Continued.
AC and heater select switch (WP
harness in question (WP 0195 00 thru
0055 00).
WP 0201 00).
(b) Engine start and battery
2. If battery voltage is present, go to Test
disconnect switches remain in ON
6.
position.
(c) Measure voltage between AC and
heater select switch wiring harness
pin 5, wire 124 (GN), and ground.
6. Check for continuity to pressure
1. If continuity is present, replace AC and
switch.
heater selector switch (WP 0055 00).
(a) Wiring harness remains
2. If continuity is not present, there is an
disconnected from pressure switch
open circuit between pressure switch
and selector switch.
and selector switch. Replace wiring
(b) Check continuity at pressure
harness in question (WP 0195 00 thru
switch wiring harness pin 2, wire
WP 0201 00).
521 (YL), and selector switch
wiring harness pin 6, wire 521
(YL).
7. Check AC compressor clutch power
1. If battery voltage is present, go to Test
circuit.
8.
(a) Wiring harness remains
2. If battery voltage is not present, there
disconnected from AC pressure
is an open circuit between AC
switch.
compressor and AC pressure switch.
(b) Disconnect wiring harness to AC
Replace wiring harness in question
compressor clutch (WP 0221 00).
(WP 0195 00 thru WP 0201 00).
(c) Use a jumper wire to short AC
pressure switch wiring harness
pins together.
(d) Turn battery disconnect and
engine start switches to ON
position (TM 5-3805-291-10).
(e) Turn AC/heater switch to AC ON
position.
(f) Measure voltage between AC
compressor clutch wiring harness
1, wire 513 (OR), and ground.
0008 00-53
