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
18. One or More Blower Motor 2. Check blower motor fuse (TM 5-3805- 1. If fuse is blown, replace fuse.
2. If fuse is OK, go to Test 3.
291-10).
Speeds Are Inoperative -
Continued.
3. Check blower switch (high).
1. If continuity is present and only high
(a) Disconnect wiring harness from
speed is inoperative, go to Test 4.
blower switch (WP 0198 00).
2. If continuity is not present, replace
(b) Place blower switch in HIGH
blower switch (WP 0198 00).
SPEED position (TM 5-3805-291-
10).
(c) Check continuity between blower
switch pins 5 and 6.
4. Check power to blower motor switch.
1. If battery voltage is present and only
(a) Disconnect wiring harness from
high speed is inoperative, there is an
blower switch (WP 0198 00).
open circuit between blower motor and
(b) Place battery disconnect and
blower switch. Replace wiring harness
engine start switches in ON
(WP 0195 00 thru WP 0201 00).
position (TM 5-3805-291-10).
2. If battery voltage is present and only
(c) Place AC/heater switch in AC ON
low and medium speeds are
position (TM 5-3805-291-10).
inoperative, go to Test 7.
(d) Measure voltage between blower
3. If battery voltage is present and all
switch wiring harness, pin 5, wire
speeds are inoperative, go to Test 10.
567 (WH), and ground.
4. If battery voltage is not present, go to
(e) Measure voltage between blower
Test 8.
switch wiring harness, pin 2, wire
567 (WH), and ground.
5. 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 0198 00).
an open circuit between blower motor
(b) Place blower switch in MEDIUM
resistor and blower switch. Replace
SPEED position (TM 5-3805-291-
wiring harness (WP 0195 00 thru WP
10).
0201 00).
(c) Check continuity between blower 2. If continuity is not present, replace
switch pins 2 and 3.
blower switch (WP 0198 00).
6. Check blower switch (low).
1. If continuity is present, go to Test 7.
(a) Disconnect wiring harness from
2. If continuity is not present, replace
blower switch (WP 0198 00).
blower switch (WP 0198 00).
(b) Place blower switch in LOW
SPEED position (TM 5-3805-291-
10).
(c) Check continuity between blower
switch pins 1 and 2.
0008 00-55
