TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
23. BACKUP ALARM DOES NOT OPERATE (MODEL B ONLY) (continued).
2.
KNOWN INFO
TEST OPTIONS
Are 22-28 volts measured
Engine switch not on.
Voltage Tests.
at the backup alarm,
Light switch in service
REASON FOR QUESTION
position "1"?
drive or park position.
Transmission shift lever in
Power to activate the
reverse position.
backup alarm circuit is
Ground circuit OK.
supplied from the chassis
wiring harness. Faults in
POSSIBLE PROBLEMS
this harness will prevent
the backup alarm from
Chassis wiring harness
sounding audible tone.
faulty.
Backup alarm switch at
transmission faulty.
Backup alarm faulty.
Go to Step 3.
NO
YES
4-454.36
10
Change 1
