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 1. Determine condition.
1. If only high speed is inoperative, go to
Test 2.
Speeds Are Inoperative.
2. If only medium speed is inoperative, go
to Test 3.
3. If only low speed is inoperative, go to
Test 4.
4. If only medium and high speeds are
inoperative, go to Test 3.
5. If only low and high speeds are
inoperative, replace blower switch
(WP 0049 00).
6. If only medium and low speeds are
inoperative, go to Test 5.
7. If all blower speeds are inoperative, go
to Test 7.
2. Check blower switch (high).
1. If continuity is present and only high
(a) Disconnect wiring harness from
speed is inoperative, there is an open
blower switch (WP 0049 00).
circuit between blower motor and
(b) Place blower switch in HIGH
blower switch. Replace wiring harness
SPEED position (TM 5-3805-290-
in question (WP 0169 00 thru WP 0175
10).
00).
(c) Check continuity between blower 2. If continuity is present and only
switch pins 2 and 3, and between
medium and high speeds are
pins 5 and 6.
inoperative, go to Test 2.
3. If continuity is not present, replace
blower switch (WP 0049 00).
3. Check blower switch (medium).
1. If continuity is present and only
(a) Disconnect wiring harness from
medium speed is inoperative, there is
blower switch (WP 0049 00).
an open circuit between blower motor
(b) Place blower switch in MEDIUM
resistor and blower switch. Replace
SPEED position (TM 5-3805-290-
wiring harness in question (WP 0169
10).
00 thru WP 0175 00).
(c) Check continuity between blower 2. If continuity is present and only
switch pins 2 and 3, and between
medium and high speeds are
pins 4 and 5.
inoperative, circuit E529 (YL) is open.
Replace wiring harness in question
(WP 0169 00 thru WP 0175 00).
3. If continuity is not present, replace
blower switch (WP 0049 00).
