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Page Title:
HORN DOES NOT OPERATE - continued |
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 TM 10-3930-673-20-1
2. HORN DOES NOT OPERATE (CONT).
8
KNOWN INFO
TEST OPTIONS
Horn OK.
Voltage test.
Is 24 vdc present at circuit
Wire 22 OK.
STE/ICE-R #89.
breaker CB6 where wire 1
Horn switch OK.
REASON FOR QUESTION
connects?
Wire 20 OK.
If voltage is present, repair wire 1.
Circuit breaker CB10 OK.
Wire 29 OK.
Relay K4 OK.
POSSIBLE PROBLEMS
Wire 1 faulty.
Circuit breaker CB6 faulty.
Connector J2 faulty.
Connector P2 faulty.
Go to Step 9 of this
NO
fault.
YES
Repair wire 1
(Para 8-48).
9
KNOWN INFO
TEST OPTIONS
Horn OK.
Voltage test.
Is 24 vdc present at circuit
Wire 22 OK.
STE/ICE-R #89.
breaker CB6 where wire 9
Horn switch OK.
REASON FOR QUESTION
connects?
Wire 20 OK.
If voltage is present, replace circuit
Circuit breaker CB10 OK.
breaker CB6.
Wire 29 OK.
Relay K4 OK.
Wire 1 OK.
POSSIBLE PROBLEMS
Circuit breaker CB6 faulty.
Wire 9 faulty.
Connector J2 faulty.
Connector P2 faulty.
Go to Step 10 of
NO
this fault.
YES
Replace circuit
breaker CB6
(Para 8-11).
2-54
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