TM 5-3805261-20
HORN AND BACK-UP ALARM TROUBLESHOOTING AND MAINTENANCE PROCEDURES.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
a.
HORN FAILS TO OPERATE.
If the horn assembly is damaged or defective--replace. Refer to paragraph 7-102.
Step 4. Test the continuity of the horn switch (Figure 7-148). Connect one multimeter lead to the back of switch
and one to ground.
Figure 7-148
If the multimeter needle does not move, the circuit does not have continuity. Replace horn switch. Refer to
paragraph 7-103.
Step 5. Check the horn wiring harness.
If the horn wiring harness is cracked, broken or corroded--repair. Refer to paragraph 7-116. If replacement is
necessary, refer to paragraph 7-131.
b.
BACK-UP ALARM FAILS TO OPERATE WITH TRANSMISSION IN REVERSE.
Step 1. Turn on service lights (refer to TM 5-3805-261-10).
Step 2. Check circuit breaker number 60A.
Reset circuit breaker.
Step 3. Check fuse number 15A.
If fuse is blown--replace. Refer to paragraph 7-63.
7-241
