TM 5-3805-290-23-1
TROUBLESHOOTING WITHOUT A DIAGNOSTIC CODE - CONTINUED
0008 00
Table 2. Electrical System Troubleshooting - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
6. Check horn relay coil ground circuit. 1. If continuity is present, there is an open
23. Horn is Inoperative -
(a) Turn engine start switch to OFF
circuit between horn relay and horn.
Continued.
position (TM 5-3805-290-10).
Replace wiring harness in question
(b) Battery disconnect switch remains
(WP 0169 00 thru WP 0175 00).
in ON position (TM 5-3805-290- 2. If continuity is not present, there is an
10).
open horn relay ground circuit. Replace
(c) Horn relay remains removed.
wiring harness in question (WP 0169
(d) Check continuity at horn relay
00 thru WP 0175 00).
between wiring harness pin 2,
circuit 200 (BK), and ground.
7. Check power to horn.
1. If battery voltage is present, go to Test
(a) Disconnect wiring harness from
8.
horn (WP 0075 00).
2. If battery voltage is not present, there
(b) Turn battery disconnect switch
is an open circuit between horn and
and engine start switch to ON
horn relay. Replace wiring harness in
position (TM 5-3805-290-10).
question (WP 0169 00 thru WP 0175
(c) Select service drive mode on main
00).
light switch (TM 5-3805-290-10).
(d) Measure voltage at horn between
wiring harness pin 1, circuit 331
(OR), and ground.
8. Check continuity to horn switch.
1. If continuity is present, go to Test 9.
(a) Disconnect wiring harness from
2. If continuity is not present, there is an
horn switch (WP 0098 00).
open circuit between horn and horn
(b) Wiring harness remains
switch. Replace wiring harness in
disconnected from horn.
question (WP 0169 00 thru WP 0175
(c) Turn battery disconnect switch
00).
and engine start switch to OFF
position (TM 5-3805-290-10).
(d) Check continuity at horn between
wiring harness pin 2, circuit 332
(GY) and horn switch wiring
harness pin, circuit 332 (GY).
N OT E
Refer to Steering Wheel Replacement for location of ground wire (WP 0098
00).
9. Check horn switch continuity.
1. If continuity is present, replace horn
(a) Remove horn switch (WP 0098
(WP 0075 00). If problem still exists,
00).
there is no continuity between horn
(b) While holding horn switch in
switch and ground. Restore continuity
closed position, check continuity
between horn switch and ground (WP
across horn switch.
0022 00).
2. If continuity is not present, replace
horn switch (WP 0098 00).
0008 00-64
