TM 5-3805-290-23-1
TROUBLESHOOTING WITHOUT A DIAGNOSTIC CODE - CONTINUED
0008 00
Table 2. Electrical System Troubleshooting - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
20. One or More Blower Motor 8. Check power to AC/heater switch.
1. If battery voltage is present, go to Test
(a) Turn battery disconnect switch
9.
Speeds Are Inoperative -
and engine start switch to ON
2. If battery voltage is not present, there
Continued.
position (TM 5-3805-290-10).
is an open circuit between blower fuse
(b) Disconnect wiring harness from
and AC/heater switch. Replace wiring
AC/heater switch (WP 0049 00).
harness in question (WP 0169 00 thru
(c) Measure voltage between AC/
WP 0175 00).
heater switch wiring harness, pin
2, circuit 124 (GN), and ground;
and between AC/heater switch
wiring harness, pin 5, circuit 124
(GN), and ground.
9. Check power to blower switch.
1. If battery voltage is present, go to Test
(a) Disconnect wiring harness from
11.
blower switch (WP 0049 00).
2. If battery voltage is not present, go to
(b) Connect wiring harness to AC/
Test 10.
heater switch.
(c) Battery disconnect switch and
engine start switch remain in ON
position (TM 5-3805-290-10).
(d) Place AC/heater switch in AC ON
position.
(e) Measure voltage between blower
switch wiring harness, pin 2,
circuit E528 (PU), and ground.
10. Check power circuit to blower switch. 1. If continuity is present, replace AC/
(a) Wiring harness remains
heater switch (WP 0049 00).
disconnected from blower switch. 2. If continuity is not present, there is an
(b) Disconnect wiring harness to AC/
open circuit between blower switch
heater switch (WP 0049 00).
and AC/heater switch. Replace wiring
(c) Check continuity between blower
harness in question (WP 0169 00 thru
switch wiring harness, pin 2,
WP 0175 00).
circuit E528 (PU) and AC/heater
switch wiring harness, pin 3,
circuit E528 (PU); and between
blower switch wiring harness, pin
2, circuit E528 (PU) and AC/
heater switch wiring harness, pin
4, circuit E528 (PU).
0008 00-52
