TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
23. BACKUP ALARM DOES NOT OPERATE (MODEL B ONLY) (continued).
3.
KNOWN INFO
TEST OPTIONS
Are 22-28 volts measured
Engine switch not on.
Voltage Tests.
at the transmission
Light switch in service
REASON FOR QUESTION
backup alarm switch
drive or park position.
connector, positions "1"
Transmission shift lever in
Power to activate the
and position "2"?
reverse position.
backup alarm circuit is
Ground circuit OK.
supplied from the
transmission backup alarm
POSSIBLE PROBLEMS
switch. Faults in this
switch will prevent the
Chassis wiring harness
backup alarm from
faulty.
sounding audible tone.
Backup alarm switch at
transmission faulty.
Backup alarm faulty.
Repair or replace
chassis wiring
NO
harness
(TM 9-2320-279-20).
YES
4-414.38
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