HORN INOPERATIVE (WARNING DEVICE DOES NOT SOUND WHEN TRANSMISSION IS LEFT IN GEAR)

TM 9-2320-270-20-1

TROUBLESHOOTING - CONTINUED

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

36. HORN INOPERATIVE (WARNING DEVICE DOES NOT SOUND WHEN TRANSMISSION IS LEFT IN

GEAR).

Push horn button (1), hold, and release.

Step 1.

If horn does not sound, go to HORN INOPERATIVE (page 3-97).

Remove screws (2) and remove door pillar switch (3). Using multimeter set at 30

Step 2.

vdc, put red probe on wire no. 048 (4) and black probe on good ground.

If meter reads no voltage, install switch (page 4-312) and notify direct

support maintenance.

At door pillar switch (3), using multimeter set at 30 vdc, put red probe on wire

Step 3.

no. 331 (5), and black probe to good ground.

If meter reads no voltage, replace door pillar switch (page 4-312)

Install door pillar switch (page 4-312). At relay (6), using multimeter

Step 4.

set at 30 vdc, put red probe on wire no. 331 (7) and black probe to good

ground. Truck door must be open.

If meter reads no voltage, notify direct support maintenance.

TA239688

3-101