HORN
DIAGNOSIS AND TESTING - HORN
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.
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.
The horn system is separated into two parts: Horn
switch input and the horn relay output.
1. Using a scan tool, check to see if the Body Con-
trol Module senses the horn switch input. If the
input is not OK, then check the wiring between the
horn switch and the BCM.
2. Using a scan tool, actuate the horn relay. If the
relay activates, then check the wiring/fuse from the
Power Distribution Center (PDC) to the horns.
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Raise vehicle (Refer to LUBRICATION &
MAINTENANCE/HOISTING - STANDARD PROCE-
DURE).
(3) Disconnect electrical harness connectors (Fig.
1).
(4) Remove mounting fastener and horns.
INSTALLATION
(1) Install horns and mounting fastener.
(2) Connect electrical harness connectors.
(3) Lower vehicle.
(4) Connect battery negative cable.
HORN SWITCH
DESCRIPTION
The horn switch is integral to the driver airbag.
The horn switch can not be serviced separately. For
service procedures, (Refer to 8 - ELECTRICAL/RE-
STRAINTS/DRIVER AIRBAG - REMOVAL).
Fig. 1 HORNS
8H - 2 HORN ZB
To Next Page