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JA
DESCRIPTION AND OPERATION
. . . . . . . . . . . . . . . . . . . . . . . . . . 1
INTRODUCTION
. . . . . . . . . . . . . . . . . . . . . . . . 1
HORN CONTACT SWITCH . . . . . . . . . . . . . . . . . 1
HORN RELAY
. . . . . . . . . . . . . . . . . . . . . . . . . . 2
HORN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
DESCRIPTION AND OPERATION
INTRODUCTION
WARNING:
ON VEHICLES EQUIPPED WITH AIR-
BAG, SEE GROUP 8M, RESTRAINT SYSTEMS FOR
STEERING WHEEL OR COLUMN REMOVAL PROCE-
DURES.
The horn circuit consists of a horn contact, horn
relay, and horns. The horn circuit feed is from the
fuse to the horn relay in the Junction Block. When
the horn contact 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.
The horn(s) are grounded at the shock tower. Refer to
Group 8W, Wiring Diagrams for horn circuit.
HORN RELAY
The horn relay is a International Standards Orga-
nization (ISO) micro-relay. The terminal designations
and functions are the same as a conventional ISO
relay. However, the micro-relay terminal orientation
(or footprint) is different, current capacity is lower,
and the relay case dimensions are smaller than on
the conventional ISO relay.
The horn relay is a electromechanical device that
switches current to the horn when the Driver Airbag
Module is depressed. See the Diagnosis and Testing
section of this group for more information on the
operation of the horn relay.
The horn relay is located in the Junction Block.
Refer to the Junction Block label for horn relay iden-
tification and location.
If a problem is encountered with a continuously
sounding horn, it can usually be quickly resolved by
removing the horn relay from the Junction Block
until further diagnosis is completed. The horn relay
cannot be repaired and, if faulty, it must be replaced.
HORNS
CONTENTS
page
HORNS WILL NOT SOUND . . . . . . . . . . . . . . . . 2
SYSTEM TEST . . . . . . . . . . . . . . . . . . . . . . . . . . 3
HORN CONTACT SWITCH . . . . . . . . . . . . . . . . . 5
HORNS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
DIAGNOSIS AND TESTING
HORN
(1) Disconnect wire connector at horn.
(2) Using a voltmeter, connect one lead to ground
terminal and the other lead to the positive wire ter-
minal (Fig. 1).
(3) Depress the horn switch, battery voltage
should be present.
(4) If no voltage, refer to Horn Does Not Sound. If
voltage is OK, go to Step 5.
(5) Using ohmmeter, test ground wire for continu-
ity to ground.
(6) If no ground repair as necessary.
(7) If wires test OK and horn does not sound,
replace horn.
HORN CONTACT SWITCH
The horn contact consist of,
• A contact switch is mounted between the Driver
Airbag Module and steering wheel
• The horn wire is attached to Driver Airbag Mod-
ule mounting bracket.
+ POSITIVE
. . . . . . . . . . . . . . . . . . . . . . . . . . 5
Fig. 1 Horn and Connector
-
NEGA-
TIVE
HORNS
8G - 1
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