TM 10-3930-675-24-1
TROUBLESHOOTING PROCEDURES (NON-ERROR CODE) - CONTINUED
0007 00
Table 2. Electrical Troubleshooting Procedures (Non-Error Code) - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
7. Horn Will Not Sound When Button is Pressed 5. Check voltage (24V) at X13 pin a. Remove relay 3016 and test
- Continued.
9 with the horn switch
(WP 0113 00).
depressed.
b. Replace damaged or faulty
relay (WP 0074 00).
c. Check continuity of wires 202,
A202, and A139 (WP 0048
00-40).
d. Repair or replace damaged
wires or connectors (WP 0113
00).
6. Unplug the horn and check for a. If no voltage (24V) is found,
voltage (24V) between the two
check continuity of wires 139
pins of the harness with the
and 135B (WP 0048 00-40).
horn switch depressed.
b. Repair or replace damaged
wires or connectors (WP 0113
00).
8. Backup Lights/Alarm Does Not Operate When 1. Check position of blackout Place blackout drive/marker light
Vehicle Placed in Reverse.
drive/marker light switch.
switch in OFF position.
2. Check circuit breaker F10 for a. Reset circuit
breaker
as
trip.
required.
b. If breaker does not reset, use
the wiring diagram to check
circuit for short to ground (WP
shorted or grounded harnesses
(WP 0113 00).
c. Replace damaged or faulty
circuit breaker (WP 0074 00).
3. Inspect backup lights and a. Replace burned out lamps
alarm for damage or burned
(WP 0085 00).
out lamps.
b. Replace damaged backup
lights (WP 0085 00).
c. Test backup alarm with 24V
source.
0007 00-31
