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TM 9-2320-364-20-2
2-1406
29. HORN DOES NOT OPERATE (CONT).
Reverse lights operate
indicating circuit breaker CB3
OK.
Cab heater operates indicating
22 to 28 vdc are input to circuit
breaker CB16.
Circuit breakers CB3 and CB16
are not tripped.
Horn not grounded.
Circuit breaker CB16 faulty.
Wire 1026 faulty.
Wire 1031 faulty.
Horn button faulty.
Steering column ground faulty.
Wire 1016 faulty.
Harness wire 1016 faulty.
Horn relay R3 faulty.
Wire 1168 faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Continuity test.
STE/ICE-R #91.
Horn will not operate if it is not
grounded.
YES
NO
Repair wire 1435 (see
schematic Fig 2-36)
or notify DS
Maintenance.
Verify repair, go to
Step 11 of this Fault.
2.
Is continuity measured on
wire 1435 between horn
connector and a known good
ground?
Replace horn
(Para 7-85).
Verify repair, go to
Step 11 of this Fault.
WARNING
Read WARNING
on Page 2-1407
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