HORN
TABLE OF CONTENTS
page page
HORN SYSTEM
DESCRIPTION ..........................1
OPERATION ............................1
DIAGNOSIS AND TESTING - HORN SYSTEM . . . 1
HORN
DIAGNOSIS AND TESTING - HORN ..........2
REMOVAL .............................2
INSTALLATION ..........................2
HORN SWITCH
DESCRIPTION ..........................2
HORN SYSTEM
DESCRIPTION
The dual-note horn system features two electro-
magnetic horn units. The horn system includes the
following major components:
• Body Control Module (BCM) - The BCM con-
trols the horn relay based on a signal received from
the horn switch or active feature (Remote Keyless
Entry (RKE) horn chirp, Vehicle Theft Alarm, Panic).
• Horn - The two horns are located on the left
side of the frame near the lower control arm.
• Horn Relay and Fuse - Located in the Power
Distribution Center (PDC).
• Horn Switch - The horn switch is integral to
the driver airbag.
OPERATION
The Body Control Module (BCM) handles the horn
switch input and controls the horn output. There is a
horn protection feature in the BCM that will not
allow the horns to function if the switch input is
“CLOSED” for more than 30 seconds. Once the
switch is “OPEN”, a 23 second delay will occur before
the horns are functional again.
The horn output operates on battery current
received through a fuse in the Power Distribution
Center (PDC). The horn system circuit is designed so
that the system will remain operational, regardless
of the ignition switch position.
DIAGNOSIS AND TESTING - HORN SYSTEM
Any diagnosis of the Horn system should
begin with the use of a scan tool and the appro-
priate Diagnostic Service Manual.
Refer to the appropriate wiring information.
In most cases, any problem involving continually
sounding horns can be quickly alleviated by removing
the horn fuse from the Power Distribution Center
(PDC).
WARNING: DISABLE THE AIRBAG SYSTEM
BEFORE ATTEMPTING ANY STEERING WHEEL,
STEERING COLUMN, SEAT BELT TENSIONER, SIDE
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.
ZB HORN 8H - 1
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