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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).
2
KNOWN INFO
TEST OPTIONS
Horn OK.
Voltage test.
Is 24 vdc present at horn
STE/ICE-R #89.
POSSIBLE PROBLEMS
switch where wire 22
REASON FOR QUESTION
Wire 22 faulty.
connects?
Horn switch Faulty.
If voltage is present, wire 22 faulty.
Wire 20 faulty.
Circuit breaker CB10 faulty.
Wire 29 faulty.
Relay K4 faulty.
Wire 1 faulty.
Circuit breaker CB6 faulty.
Wire 9 faulty.
Connector J2 faulty.
Connector P2 faulty.
Go to Step 3 of this
NO
fault.
YES
Repair wire 22
(Para 8-48).
3
KNOWN INFO
TEST OPTIONS
Horn OK.
Voltage test.
Is 24 vdc present at horn
Wire 22 OK.
STE/ICE-R #89.
switch where wire 20
POSSIBLE PROBLEMS
REASON FOR QUESTION
connects?
Horn switch Faulty.
If voltage is present, horn switch
Wire 20 faulty.
faulty.
Circuit breaker CB10 faulty.
Wire 29 faulty.
Relay K4 faulty.
Wire 1 faulty.
Circuit breaker CB6 faulty.
Wire 9 faulty.
Connector J2 faulty.
Connector P2 faulty.
Go to Step 4 of this
NO
fault.
YES
Replace horn
switch (Para 8-7).
2-48
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