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 4. Check blower switch (low).
1. If continuity is present, go to Test 5.
(a) Disconnect wiring harness from
2. If continuity is not present, replace
Speeds Are Inoperative -
blower switch (WP 0049 00).
blower switch (WP 0049 00).
Continued.
(b) Place blower switch in LOW
SPEED position (TM 5-3805-290-
10).
(c) Check continuity between blower
switch pins 1 and 2.
5. Check blower motor resistor.
1. If continuity is present, go to Test 6.
(a) Disconnect wiring harness from
2. If continuity is present and only
blower motor resistor (WP 0143
medium and low speeds are
00).
inoperative, there is an open circuit
(b) Check continuity between blower
between blower motor resistor and
motor resistor's two outermost
blower motor. Replace wiring harness
pins.
in question (WP 0169 00 thru WP 0175
00).
3. If continuity is not present, replace
blower motor resistor (WP 0143 00).
6. Check low speed circuit.
1. If continuity is not present, there is an
(a) Wiring harness remains
open circuit between blower motor
disconnected from blower switch.
resistor and blower switch. Replace
(b) Wiring harness remains
wiring harness in question (WP 0169
disconnected from blower motor
00 thru WP 0175 00).
resistor.
2. If continuity is present, there is an open
(c) Check continuity between blower
circuit between blower motor resistor
switch wiring harness pin 1, circuit
and blower motor. Replace wiring
517 (BU), and blower motor
harness in question (WP 0169 00 thru
resistor wiring harness circuit 517
WP 0175 00).
(BU).
7. Check blower fuse (TM 5-3805-290-
1. If fuse is open, replace it.
10).
2. If fuse is OK, go to Test 8.
0008 00-51
