WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAG, REFER TO ELECTRICAL, RESTRAINTS FOR
SAFETY PRECAUTIONS. DISCONNECT THE NEGA-
TIVE CABLE FROM THE BATTERY BEFORE SER-
VICING COMPONENTS INVOLVING THE AIRBAG
SYSTEM. ACCIDENTAL DEPLOYMENT OF AIRBAG
AND PERSONAL INJURY CAN RESULT.

The horn circuit consists of a horn switch, clock

spring, wiring, horn relay, and horns. The horn
switch is a membrane switch located in the airbag
trim cover. The horn is located below the right side
headlamp.

OPERATION

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 horn. The horn is grounded at
the shock tower through the headlamp and dash har-
ness. Refer to the appropriate wiring information.
The wiring information includes wiring diagrams,
proper wire and connector repair procedures, details
of wire harness routing and retention, connector pin-
out information and location views for the various
wire harness connectors, splices and grounds.

DIAGNOSIS AND TESTING - HORN SYSTEM

CAUTION: Continuous sounding of horns will cause
horn to fail.

Check fuse 8 in the Junction Block, and refer to

Horn System Test table.

Refer to the appropriate wiring information. The

wiring information includes wiring diagrams, proper
wire and connector repair procedures, details of wire
harness routing and retention, connector pin-out
information and location views for the various wire
harness connectors, splices and grounds.

HORN SYSTEM TEST

CONDITION

POSSIBLE CAUSE

CORRECTION

HORN SOUNDS CONTINUOUSLY.
NOTE: IMMEDIATELY UNPLUG HORN
RELAY IN THE JUNCTION BLOCK

(1) FAULTY HORN RELAY.

(1) REFER TO HORN RELAY TEST.

(2) HORN CONTROL
CIRCUIT TO RELAY
SHORTED TO GROUND.

(2) CHECK HORN RELAY
TERMINAL 8 IN THE JUNCTION
BLOCK FOR CONTINUITY TO
GROUND INDICATES:
(A) WIRING HARNESS SHORTED
TO GROUND.
(B) FIND THE SHORT AND REPAIR
AS NECESSARY.

HORN

8H - 1

CONDITION

POSSIBLE CAUSE

CORRECTION

(3) PINCHED HORN
SWITCH WIRE UNDER
DRIVER AIRBAG MODULE.

(3) REMOVE DRIVER AIRBAG
MODULE AND CHECK FOR
RUBBING, SHORTED OR LOOSE
WIRE CONNECTOR AND REPAIR
AS NECESSARY.

(4) FAULTY HORN SWITCH

(4) REPLACE DRIVER AIRBAG
MODULE TRIM.

HORN SOUND INTERMITTENTLY AS
THE STEERING WHEEL IS TURNED.

(1) HORN RELAY
CONTROL CIRCUIT X3 IS
SHORTED TO GROUND
INSIDE STEERING
COLUMN OR THE WHEEL.

(1) REMOVE DRIVER AIRBAG
MODULE AND/OR STEERING
WHEEL AS NEEDED. CHECK FOR
RUBBING OR LOOSE WIRE/
CONNECTOR, REPAIR AS
NECESSARY.

(2) PINCHED HORN
SWITCH WIRE UNDER
DRIVER AIRBAG MODULE

(2) REPLACE DRIVER AIRBAG
MODULE.

(3) FAULTY HORN SWITCH

(3) REPLACE DRIVER AIRBAG
MODULE TRIM.

(4) FAULTY CLOCKSPRING

(4) REPLACE CLOCKSPRING

HORN DOES NOT SOUND

(1) CHECK FUSE 8 IN THE
JUNCTION BLOCK.

(1) REPLACE FUSE IF BLOWN AS
REPAIR AS NECESSARY.

(2) NO VOLTAGE AT HORN
RELAY TERMINALS 6 & 8,
AND FUSE IS OK.

(2) NO VOLTAGE, REPAIR OR
REPLACE JUNCTION BLOCK AS
NECESSARY.

(3) FAULTY OR DAMAGED
HORN.

(3) VOLTAGE AT HORN WHEN
HORN SWITCH IS PRESSED,
REPLACE HORN.

(4) FAULTY HORN SWITCH

(4) REPLACE DRIVER AIRBAG
MODULE TRIM.

FUSE BLOWS WHEN HORN IS
BLOWN

(1) SHORT CIRCUIT IN
HORN OR HORN WIRING
OR FAULTY RELAY

(1) REMOVE HORN RELAY, CHECK
FOR SHORTED HORN OR HORN
WIRING. DISCONNECT HORN WIRE
HARNESS TO ISOLATE SHORT
AND REPAIR AS NECESSARY.

FUSE BLOWS WITHOUT BLOWING
HORN

(1) SHORT CIRCUIT IN
CIRCUIT FROM STEERING
COLUMN SWITCH TO
HORN RELAY

(1) REMOVE RELAY, INSTALL NEW
FUSE, IF FUSE DOES NOT BLOW
REPLACE HORN RELAY. IF FUSE
BLOWS WITH RELAY REMOVED,
CHECK FOR SHORT TO GROUND
WITH OHMMETER ON CIRCUIT
BETWEEN TERMINALS 6 & 8 AND
THE FUSE TERMINAL. REPAIR AS
NECESSARY.

(2) FAULTY RELAY

(2) REPLACE RELAY

(3) FAULTY BODY
CONTROLLER

(3) REPLACE BODY CONTROLLER

8H - 2

HORN

HORN SYSTEM (Continued)

HORN

DIAGNOSIS AND TESTING - HORN

Refer to the appropriate wiring information. The

Check horn fuse 16 in the Power Distribution Cen-

ter and fuse 8 in the Junction Block. If fuse is blown
refer to FUSE BLOWN. If fuse is OK, refer to FUSE
OK.

FUSE BLOWN

(1) Verify condition of battery terminals and volt-

age, (Refer to 8 - ELECTRICAL/BATTERY SYSTEM
- DESCRIPTION). If battery connections and battery
charge is OK, go to Step 2.

(2) Using a voltmeter, test for battery voltage at

both sides of horn fuse 8. If voltage is OK, on both
sides of fuse, go to Fuse OK. If voltage is OK, on one
side of fuse, the fuse is blown, go to Step 3.

(3) Using a suitable ammeter in place of the fuse,

test amperage draw of the horn circuit. If amperage
draw is greater than 20 amps without the horn
switch depressed, a grounded circuit exists between
the fuse and the horn relay. Go to Step 4. If amper-
age draw is greater than 20 amps with the horn
switch depressed, a grounded circuit exists between
the horn relay and the horn. Go to Step 6.

(4) Remove the horn relay from the Junction

Block. If the amperage draw drops to 0 amps, the
horn switch or circuit is shorted. If amperage does
not drop go to Step 5.

(5) Disconnect both horns. If amperage does not

drop with both horns disconnected and the horn
switch depressed, go to Step 7. If the amperage draw
drops go to Step 6.

(6) Disconnect the wire connector from one of the

horns. If amperage drops and the connected horn
sounds, reverse the procedure, and replace the faulty
horn.

(7) Using a continuity tester, with the horns dis-

connected test continuity of the X2 cavity of the horn
relay to ground. If continuity is detected, the circuit
is grounded between the Junction Block and the
horns. Locate and repair pinched harness. If the
amperage draw does not drop to 0 amps, repair short
at the Junction Block.

FUSE OK

(1) Remove the horn relay from the Junction

Block.

(2) Using a continuity tester, Depress horn switch

and test continuity from the X3 cavity of the horn
relay to ground.

(a) If continuity is detected, go to Step 3.
(b) If NO continuity, go to Step 4.

(3) Using a suitable jumper wire, jump across the

fuse F62 cavity and the X2 cavity of the horn relay in
the Junction Block.

(a) If the horn sounds, replace the horn relay.
(b) If the horn does not sound, go to Step 4.

(4) Remove airbag/horn pad from steering wheel.

(Refer to 8 - ELECTRICAL/RESTRAINTS/DRIVER
AIRBAG - REMOVAL).

(5) Test continuity across horn switch connectors

with horn switch depressed.

(a)

If continuity is detected, repair open circuit

between the relay and the horn switch.

(b) If NO continuity, replace airbag cover.

(6) Install horn relay into Junction Block.
(7) Disconnect the wire connector from horn.
(8) Using

voltmeter,

with

the

horn

switch

depressed test voltage across horn connector termi-
nals of the wire harness.

(a)

If voltage is detected, replace horn.

(b)

If NO voltage, go to Step 9.

(9) With the horn switch depressed, test for volt-

age between the X2 circuit and ground.

(a) If voltage OK, repair system ground at right

cowl area.

(b) If NO voltage, repair open X2 circuit between

the relay and the horns.

REMOVAL

(1) Disconnect and isolate the battery negative

cable.

(2) Remove right side headlamp unit. (Refer to 8 -

ELECTRICAL/LAMPS/LIGHTING

EXTERIOR/

HEADLAMP UNIT - REMOVAL).

(3) Remove horn mounting bolt.
(4) Disconnect wire harness connector.

INSTALLATION

(1) Connect wire harness connector.
(2) Install horn mounting bolt.
(3) Install right side headlamp unit. (Refer to 8 -

ELECTRICAL/LAMPS/LIGHTING

EXTERIOR/

HEADLAMP UNIT - INSTALLATION).

(4) Connect battery negative cable.

HORN

8H - 3

HORN RELAY

DESCRIPTION

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.

OPERATION

The horn relay is a electromechanical device that

switches current to the horn when the Driver Airbag
Module is depressed.

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.

DIAGNOSIS AND TESTING - HORN RELAY

Refer to the appropriate wiring information. The

(1) Remove horn relay from the Junction Block.
(2) Using ohmmeter, test between the Junction

Block relay terminal 7 and ground for continuity.

(a) When the horn contact is not depressed, no

continuity.

(b) Continuity to ground when horn contact is

depressed.

tact or wiring as necessary.
(3) Insert a jumper wire between terminals 8 and

10 of the horn relay in the Junction Block.

(a) If horn sounds replace relay.
(b) If the horn does not sound, install horn relay

(Refer to 8 - ELECTRICAL/HORN/HORN - DIAG-
NOSIS AND TESTING).
(4) Using voltmeter, test battery voltage:

(a) Test Junction Block horn relay terminals 6

and 8 for voltage from fuse 8.

(b) If not OK, repair as necessary.

HORN SWITCH

DESCRIPTION

The horn switch is molded into the airbag trim

cover. The horn switch can not be serviced separately.
(Refer to 8 - ELECTRICAL/RESTRAINTS/DRIVER
AIRBAG - REMOVAL) for service procedures.

8H - 4

HORN

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