TM 5-3805-296-23-2
0135
Table 1. Defrost Fan Fails To Operate.
0135
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
NOTE
Defrost Fan Fails To Operate
Always inspect harness connectors that are involved in the circuit. Poor
connections can often be the cause of a problem in an electrical circuit.
Verify that all connections in the circuit are clean and secure and that all
connections are in good condition. If a problem with the connection is
found, correct the problem and verify that this malfunction or diagnostic
code is active before performing this procedure.
Perform open or short-circuit test at each harness connection to identify
the correct harness to replace.
Tag all wiring harnesses to aid in installation.
Perform this test only if condition is active.
Test Step 1. Test Defrost Fan
Operation.
1. Turn battery disconnect switch and
ignition switch to ON position
(TM 5-3805-296-10).
Fan Does Not Operate Proceed to
2. Operate defrost fan in low speed
Test Step 2.
and high speed
Fan Operates Only in One Speed
(TM 5-3805-296-10).
Replace defrost fan (WP 0473).
Proceed to Test Step 10.
Test Step 2. Test Voltage to Defrost
Fan.
1. Turn defrost fan OFF
(TM 5-3805-296-10).
2. Turn ignition switch and battery
disconnect switch to OFF position
(TM 5-3805-296-10).
3. Disconnect connector H-C14
(WP 0012, Figure 227) from
connector VV-C1
(WP 0012, Figure 226).
4. Turn battery disconnect switch and
ignition switch to ON position
(TM 5-3805-296-10).
5. Using digital multimeter
Voltage 18 to 26 V Replace defrost
(WP 0540), test for voltage
fan (WP 0473).
between connector H-C14
Proceed to Test Step 10.
terminal 1 and terminal 2
Voltage Less Than 18 V Proceed to
(WP 0012, Figure 227).
Test Step 3.
Test Step 3. Test for Open Fuse.
1. Turn ignition switch and battery
disconnect switch to OFF position
(TM 5-3805-296-10).
