TM 5-3805-291-23-1
TROUBLESHOOTING WITHOUT A DIAGNOSTIC CODE - CONTINUED
0008 00
Table 8. AC System Troubleshooting - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. Check blend door for movement
1. If blend door opens and closes
2.
Temperature of Air Flow is
(a) Turn battery disconnect and
properly, go to Test 6.
Warm.
engine start switches to ON
2. If blend door does not appear to open
position (TM 5-3805-291-10).
and close properly, go to Test 2.
(b) While moving the temperature
control switch back and forth
between full hot and full cold,
listen for blend door movement.
2. Check power to blend door actuator.
1. If voltage is present, go to Test 3.
(a) Disconnect wiring harness from
2. If voltage is not present, there is an
blend door actuator (WP 0052 00).
open circuit between power converter
(b) Turn battery disconnect and
and blend door actuator. Replace
engine start switches to ON
wiring harness in question (WP 0195
position (TM 5-3805-291-10).
00 00 thru WP 0200 00).
(c) Measure voltage between blend
door actuator pin A, circuit 135
(BU), harness side and ground.
3. Check blend door actuator circuits.
1. If continuity is present, go to Test 4.
(a) Disconnect wiring harness from
2. If continuity is not present, there is an
HVAC temperature control switch
open circuit between HVAC
(WP 0055 00).
temperature control switch and blend
(b) Check for continuity with
door actuator. Replace wiring harness
resistance between blend door
in question (WP 0195 00 00 thru WP
actuator pin 3, circuit 200 (BK),
0200 00).
harness side and HVAC
temperature control switch pin A,
circuit A523 (PU), harness side.
4. Check blend door actuator circuits.
1. If continuity is present, go to Test 5.
(a) Check for continuity between
2. If continuity is not present, there is an
blend door actuator pin 4, circuit
open circuit between HVAC
A524 (BR), harness side and
temperature control switch and blend
HVAC temperature control switch
door actuator. Replace wiring harness
pin B, circuit A524 (BR), harness
in question (WP 0195 00 00 thru WP
side.
0200 00).
5. Check blend door actuator circuits.
1. If continuity is present, replace HVAC
(a) Check for continuity with
temperature control switch (WP 0052
resistance between blend door
00).
actuator pin 1, circuit 592 (BU),
2. If continuity is not present, there is an
harness side and HVAC
open circuit between HVAC
temperature control switch pin C,
temperature control switch and blend
circuit A525 (GN), harness side.
door actuator. Replace wiring harness
in question (WP 0195 00 thru WP 0200
00).
3. If problem still exists, replace blend
door actuator (WP 0052 00).
