TM 5-3805-296-23-2
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Table 1. Heater Does Not Operate Properly.
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MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
NOTE
Heater Does Not Operate
Properly
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. Inspect Heater Isolation
Valves.
1. Turn ignition switch and battery
disconnect switch to OFF position
(TM 5-3805-296-10).
Both Valves Open Proceed to Test
2. Verify heater isolation valves
Step 2.
(Figure 1, Items 1 and 2) are
One or Both Valves Closed Turn
turned counterclockwise to open
valve handles counterclockwise to open
position.
valves.
Proceed to Test Step 14.
Figure 1. Heater Isolation Valves.
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