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TM 9-2320-364-20-2
2-1404
29. HORN DOES NOT OPERATE.
INITIAL SETUP
1.
Go to Step 3 of this
Fault.
START
YES
NO
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
Voltage test.
STE/ICE-R #89.
If 22 to 28 vdc are not
measured, the horn will not
operate.
2-20. ELECTRICAL SYSTEM TROUBLESHOOTING (CONT).
Tools and Special Tools
Tool Kit, General Mechanic’s: Automotive
(Item 74, Appendix G)
STE/ICE-R (optional) (Item 3, Appendix G)
Multimeter (Item 44, Appendix G)
Personnel Required
Two
Equipment Condition
Engine OFF, (TM 9-2320-364-10)
Parking brake applied, (TM 9-2320-364-10)
Wheels chocked, (TM 9-2320-364-10)
References
TM 9-2320-364-10
TM 9-4910-571-12&P
Are 22 to 28 vdc measured on
wire 1168 at horn?
WARNING
Read WARNING
on Page 2-1405
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