TM 5-3805-298-23-2
0141
Table 1. Horn Does Not Operate - Continued.
0141
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Horn Does Not Operate -
Test Step 3. Test for Voltage at Lower
Continued
Cab Wiring Harness.
1. Turn ignition switch and battery
disconnect switch to OFF position
(TM 5-3805-298-10).
2. Remove right lower cab access
panels (WP 0347).
3. Disconnect connector C-C10
(WP 0012, Figure 86) from
connector LE-C1 (WP 0012,
Figure 87).
4. Turn battery disconnect switch and
ignition switch to ON position
(TM 5-3805-298-10).
5. Have an assistant operate and
hold in the horn button
(TM 5-3805-298-10).
6. Using digital multimeter
Voltage 18 to 26 V Replace front
(WP 0174), test for voltage
frame wiring harness (WP 0301).
between connector C-C10
Proceed to Test Step 24.
(WP 0012, Figure 86) terminal 7
Voltage Less Than 18 V Proceed to
and terminal 6 (ground).
Test Step 4.
Test Step 4. Test Horn Button Switch.
1. Turn ignition switch and battery
disconnect switch to OFF position
(TM 5-3805-298-10).
2. Remove instrument cluster for
access to wiring harness
connectors (WP 0252).
3. Disconnect connector C-C4
(WP 0012, Figure 205) from horn
switch (WP 0012, Figure 206).
4. Have an assistant operate and
hold in the horn button
(TM 5-3805-298-10).
5. Using digital multimeter
Resistance 5.0 Ohms or Less
(WP 0174), measure resistance
Replace lower cab wiring harness
between horn switch
(WP 0291).
(WP 0012, Figure 206) terminal 2
Proceed to Test Step 24.
and ground.
Resistance Greater Than 5.0 Ohms
Replace horn contact switch
(WP 0332).
Proceed to Test Step 24.
0141-3