Jeep Grand Cherokee WK. Manual — part 394
SCHEMATICS AND DIAGRAMS
HORN
SYSTEM
8H - 16
HORN - ELECTRICAL DIAGNOSTICS
WK
HORN SYSTEM - SERVICE INFORMATION
TABLE OF CONTENTS
page
page
HORN SYSTEM - SERVICE INFORMATION
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DIAGNOSIS AND TESTING - HORN SYSTEM
HORN
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
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SWITCH-HORN
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HORN SYSTEM - SERVICE INFORMATION
DESCRIPTION
The dual-note horn system features dual electromag-
netic horn units. The horn system includes the follow-
ing major components:
•
Horn - The two horns are located on the right
side of the vehicle behind the fascia.
•
Horn Switch - The horn switch is located in the
driver airbag trim cover.
OPERATION
The horn system operates on battery current received through a fuse in the Integrated Power Module (IPM). The
horn system circuit is designed so that the system will remain operational, regardless of the ignition switch position.
DIAGNOSIS AND TESTING - HORN SYSTEM
The most reliable, efficient, and accurate means to diagnose the horn system requires the use of a scan
tool and the proper Diagnostic Procedures information.
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 Integrated Power Module (IPM).
WK
HORN SYSTEM - SERVICE INFORMATION
8H - 17
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 ISOLATE THE BATTERY NEGATIVE (GROUND) CABLE, THEN WAIT TWO MIN-
UTES FOR THE AIRBAG SYSTEM CAPACITOR TO DISCHARGE BEFORE PERFORMING FURTHER DIAGNO-
SIS OR SERVICE. THIS IS THE ONLY SURE WAY TO DISABLE THE AIRBAG SYSTEM. FAILURE TO TAKE
THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLE
PERSONAL INJURY.
HORN
DIAGNOSIS AND TESTING
HORN
The most reliable, efficient, and accurate means to diagnose the horn system requires the use of a scan
tool and the proper Diagnostic Procedures information.
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 ISOLATE THE BATTERY NEGATIVE (GROUND) CABLE, THEN WAIT TWO MIN-
UTES FOR THE AIRBAG SYSTEM CAPACITOR TO DISCHARGE BEFORE PERFORMING FURTHER DIAGNO-
SIS OR SERVICE. THIS IS THE ONLY SURE WAY TO DISABLE THE AIRBAG SYSTEM. FAILURE TO TAKE
THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLE
PERSONAL INJURY.
REMOVAL
1. Disconnect and isolate the battery negative cable.
2. Raise and support the vehicle.
3. Remove the lower front half of the inner liner from
the right front fender wheel house.
4. Disconnect the electrical harness connectors.
5. Remove the mounting fastener.
6. Remove both horns and the mounting bracket as a
unit.
8H - 18
HORN SYSTEM - SERVICE INFORMATION
WK
INSTALLATION
1. Position both horns and the mounting bracket.
2. Install and tighten the mounting fastener.
3. Connect the electrical harness connectors.
4. Install the lower front half of the inner liner to the
right front fender wheel house.
5. Lower the vehicle.
6. Connect the battery negative cable.
SWITCH-HORN
DESCRIPTION
A center-blow, normally open, resistive membrane-type horn switch is secured in a plastic tray that is inserted in a
pocket sewn on the front of the driver side airbag retainer strap. The horn switch is concealed behind the driver side
airbag module trim cover.
The steering wheel and steering column must be properly grounded in order for the horn switch to function properly.
The horn switch and plastic tray are serviced as a unit. If the horn switch is damaged or inoperative, or if the driver
side airbag is deployed, the horn switch and tray must be replaced as a unit.
DIAGNOSIS AND TESTING
HORN SWITCH
The most reliable, efficient, and accurate means to diagnose the horn system requires the use of a scan
tool and the proper Diagnostic Procedures information.
For complete circuit diagrams, refer to the appropriate wiring information.
WK
HORN SYSTEM - SERVICE INFORMATION
8H - 19
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