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TM 5-4210-233-14&P-1
Table 4-2.
Unit Troubleshooting-Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ELECTRICAL SYSTEM-CAB CONTROLS AND INDICATORS-Continued
6
BACKUP LIGHTS DO NOT ILLUMINATE, OR BACKUP ALARM DOES NOT SOUND-Continued
Step 3.
Check for +12V at circuit breaker #14 on battery accessory buss.
Replace breaker (see para 4-99).
Step 4.
Check wiring for continuity.
Replace wire.
(see para 4-9.4)
7
BRAKE LIGHTS DO NOT ILLUMINATE WITH FOOT PEDAL
(Refer to Electrical Wiring Diagrams, Appendix H, Sheet 8 of 16.)
Step 1.
Check bulb.
Replace bulb (see para 4-65).
Step 2.
Check PSI switch for proper operation.
Replace switch (see para 4-9.4).
Step 3.
Check brake light relay for proper operation.
Replace relay (see para 4-9.4).
Step 4.
Check for +12V at circuit breaker #1 3 on battery accessory buss.
Replace breaker (see para 4-99).
Step 5.
Check wiring for continuity.
Replace wire (see para 4-9.4).
8
MECHANICAL SIREN DOES NOT OPERATE
(Refer to Electrical Wiring Diagrams, Appendix H, Sheet 1 of 16.)
Step 1.
Check motor.
Replace motor (see para 4-91).
Step 2
Check solenoid.
Replace solenoid (see para 4-9.4).
4-80
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