Chrysler 300M Service Manual page 312

LH
HORN SYSTEM
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . 1
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
DIAGNOSIS AND TESTING - HORN SYSTEM . . . 1
HORN
DIAGNOSIS AND TESTING - HORN
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . 3
HORN SYSTEM
DESCRIPTION
A dual-note electric horn system is standard facto-
ry-installed equipment on this model. The horn cir-
cuit consists of a horn switch, horn relay, and horns.
OPERATION
The horn circuit feed is from the fuse to the horn
relay in the Junction Block. When the horn switch is
depressed, it completes the ground circuit. Then the
horn relay coil closes a set of contacts which allows
current to flow to the horns.
DIAGNOSIS AND TESTING - HORN SYSTEM
WARNING: DISABLE
BEFORE ATTEMPTING ANY STEERING WHEEL,
STEERING COLUMN, SEAT BELT TENSIONER, SIDE
CONDITION
HORN SOUNDS CONTINUOUSLY.
NOTE: IMMEDIATELY UNPLUG HORN
AND RELAY IN THE JUNCTION
BLOCK
HORN
TABLE OF CONTENTS
page
. . . . . . . . . . 3
THE AIRBAG SYSTEM
HORN SYSTEM TEST
POSSIBLE CAUSE
1. FAULTY HORN RELAY.
2. HORN CONTROL
CIRCUIT TO RELAY
SHORTED TO GROUND.
HORN RELAY
DIAGNOSIS AND TESTING - HORN RELAY
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . 3
HORN SWITCH
DIAGNOSIS AND TESTING - HORN SWITCH
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
AIRBAG, OR INSTRUMENT PANEL COMPONENT
DIAGNOSIS OR SERVICE. DISCONNECT AND ISO-
LATE THE BATTERY NEGATIVE (GROUND) CABLE,
THEN WAIT TWO MINUTES FOR THE AIRBAG SYS-
TEM CAPACITOR TO DISCHARGE BEFORE PER-
FORMING FURTHER DIAGNOSIS OR SERVICE. THIS
IS THE ONLY SURE WAY TO DISABLE THE AIRBAG
SYSTEM. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.
CAUTION: Continuous sounding of horns will cause
horn to fail.
Check fuse 18 in the Junction Block and fuse L in
the Power Distribution Center. Refer to Horn System
Test table.
1. REFER TO HORN RELAY TEST.
2. CHECK HORN RELAY TERMINAL
7 IN JUNCTION BLOCK FOR
CONTINUITY TO GROUND
A. WIRING HARNESS SHORTED TO
B. FIND THE SHORT AND REPAIR
HORN 8H - 1
page
. . . . 3
. . . 4
CORRECTION
INDICATES:
GROUND.
AS NECESSARY.