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 7. Check blower motor resistor.
1. If continuity is present and only low
(a) Disconnect wiring harness from
speed is inoperative, there is an open
Speeds Are Inoperative -
blower motor resistor.
circuit between blower motor resistor
Continued.
(b) Check continuity between blower
and blower switch. Replace wiring
motor resistor's two outermost
harness (WP 0195 00 thru WP 0201
pins.
00).
2. If continuity is present and only
medium and low speeds are
inoperative, there is an open circuit
between blower motor resistor and
blower motor. Replace wiring harness
(WP 0195 00 thru WP 0201 00).
3. If continuity is not present, replace
blower motor resistor.
8. Check power to AC/heater switch.
1. If battery voltage is present, go to Test
(a) Turn battery disconnect and
9.
engine start switches to ON
2. If battery voltage is not present, there
position (TM 5-3805-291-10).
is an open circuit between HVAC
(b) Disconnect wiring harness from
blower breaker and AC/heater switch.
AC/heater switch (WP 0198 00).
Replace wiring harness in question
(c) Measure voltage between AC/
(WP 0195 00 thru WP 0201 00).
heater switch wiring harness, pin
2, wire 124 (GN), and ground; and
between AC/heater switch wiring
harness, pin 5, wire 124 (GN), and
ground.
9. Check power circuit to blower switch. 1. If continuity is present, replace AC/
(a) Wiring harness remains
heater switch (WP 0198 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 0198 00).
and AC/heater switch. Replace wiring
(c) Check continuity between blower
harness in question (WP 0195 00 thru
switch wiring harness, pin 2, wire
WP 0201 00).
567 (WH), and AC/heater switch
wiring harness, pin 3, wire 567
(WH); and between blower switch
wiring harness, pin 2, wire 567
(WH), and AC/heater switch
wiring harness, pin 1, wire 567
(WH).
0008 00-56
