TM 10-3930-675-20-1
0006 00-9
TROUBLESHOOTING PROCEDURES (NON-ERROR CODE) - CONTINUED
0006 00
Table 2. Electrical Troubleshooting Procedures (Non-Error Code) - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
HORN, BACKUP ALARM, AND BACKUP
LIGHTS
8. Horn Will Not Sound When Button is
Pressed.
1. Check position of blackout
drive/marker light switch.
Place blackout drive/marker light
switch in OFF position.
2. Ensure that blackout light
circuit breakers numbers 24
and 9 are not tripped.
Reset
circuit
breaker(s)
as
required (WP 0073 00).
3. Inspect horn, wiring harness,
relay 3016, and connectors for
damage,
continuity,
and
proper voltage (20-25V).
a. Repair or replace damaged
wires, relay or connectors
(WP 0073 00 or WP 0111 00).
b. Replace damaged horn (WP
0104 00).
4. Check accessory control lever
switches
and
wiring
for
damage and continuity (WP
0199 00-40).
Replace
damaged
accessory
control lever unit (WP 0112 00).
9. Backup Alarm Will Not Sound When Truck
is Placed In Reverse.
1. Check position of blackout
drive/marker light switch.
Place blackout drive/marker light
switch in OFF position.
2. Ensure that reverse alarm and
light circuit breaker number 10
is not tripped.
Reset circuit breaker as required
(see WP 0073 00).
3. Inspect alarm, wiring harness,
and connectors for damage,
continuity, and proper voltage
(24 volts).
a. Repair or replace damaged
wires or connectors (WP
0111 00).
b. Replace damaged alarm (WP
0105 00).
10. Backup Lights Do Not Operate When Truck
is Placed In Reverse.
1. Check position of blackout
drive/marker light switch.
Place blackout drive/marker light
switch in OFF position.
2. Ensure reverse alarm and
backup light circuit breaker
number 10 is not tripped.
Reset circuit breaker as required
(WP 0073 00).
3. Inspect backup lights for
damage or burned out lamps.
a. Replace burned out lamps
(WP 0084 00).
b. Replace damaged backup
light (WP 0084 00).
4. Check backup light wiring
harnesses and connectors for
damage,
continuity,
and
proper voltage (20-25V) (WP
0199 00-45).
Repair or replace damaged wires
or connectors (WP 0111 00).
