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TM 9-2320-364-20-2
2-1408
29. HORN DOES NOT OPERATE (CONT).
3.
Replace circuit
breaker CB16
(Para 7-16).
Verify repair, go to
Step 11 of this Fault.
YES
NO
Reverse lights operate
indicating circuit breaker CB3
OK.
Cab heater operates indicating
22 to 28 vdc is input to circuit
breaker CB16.
Circuit breakers CB3 and CB16
are not tripped.
Horn 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
Voltage test.
STE/ICE-R #89.
If 22 to 28 vdc are not present at
CB16 R3, horn will not operate.
WARNING
Are 22 to 28 vdc measured on
wire 1026 at circuit
breaker CB16?
Read WARNING
on Page 2-1409
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