HORN SYSTEM TEST
CONDITION POSSIBLE CAUSE CORRECTION
HORN SOUNDS
CONTINUOUSLY.
NOTE: IMMEDIATELY
UNPLUG HORN AND RELAY
IN THE JUNCTION BLOCK
1. FAULTY HORN RELAY.
2. HORN CONTROL CIRCUIT
TO RELAY SHORTED TO
GROUND.
3. HORN RELAY CONTROL
CIRCUIT X3 SHORTING TO
GROUND INSIDE STEERING
WHEEL.
4. PINCHED HORN SWITCH
WIRE UNDER DRIVER
AIRBAG MODULE.
5. DEFECTIVE HORN
SWITCH
1. REFER TO HORN RELAY TEST.
2. CHECK HORN RELAY TERMINAL 7 IN
JUNCTION BLOCK FOR CONTINUITY TO
GROUND INDICATES:
A. WIRING HARNESS SHORTED TO
GROUND.
B. FIND THE SHORT AND REPAIR AS
NECESSARY.
3. REMOVE DRIVER AIRBAG MODULE
AND CHECK FOR RUBBING, SHORTED
OR LOOSE WIRE CONNECTOR AND
REPAIR AS NECESSARY.
4. REPLACE DRIVER AIRBAG MODULE.
5. REPLACE DRIVER AIRBAG MODULE.
HORN SOUND
INTERMITTENTLY AS THE
STEERING WHEEL IS
TURNED.
1. HORN RELAY CONTROL
CIRCUIT 3 IS SHORTED TO
GROUND INSIDE STEERING
WHEEL.
2. PINCHED HORN SWITCH
WIRE UNDER DRIVER
AIRBAG MODULE
3. DEFECTIVE HORN
SWITCH
1. REMOVE DRIVER AIRBAG MODULE
AND CHECK FOR RUBBING OR LOOSE
WIRE/CONNECTOR, REPAIR AS
NECESSARY.
2. REPLACE DRIVER AIRBAG MODULE.
3. REPLACE DRIVER AIRBAG MODULE.
HORN DOES NOT SOUND 1. CHECK FUSE 18 IN THE
JUNCTION BLOCK.
2. NO VOLTAGE AT HORN
RELAY TERMINALS1&2
AND FUSE IS OK.
3. OPEN CIRCUIT FROM
TERMINAL 7 OF THE RELAY
TO HORN SWITCH X3
CIRCUIT.
4. DEFECTIVE OR DAMAGED
HORN.
5. DEFECTIVE HORN
SWITCH
1. REPLACE FUSE IF BLOWN AS REPAIR
AS NECESSARY.
2. NO VOLTAGE, REPLACE JUNCTION
BLOCK OR REPAIR AS NECESSARY.
3. REPAIR CIRCUIT AS NECESSARY.
4. VOLTAGE AT HORN WHEN HORN
SWITCH IS PRESSED, REPLACE HORN.
5. REPLACE DRIVER AIRBAG MODULE.
FUSE BLOWS WHEN HORN
IS BLOWN
1. SHORT CIRCUIT IN HORN
OR HORN WIRING
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 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 BETWEEN
TERMINALS1&2ANDTHEFUSE
TERMINAL. REPAIR AS NECESSARY.
NOTE: FOR WIRING REPAIRS
REFER TO GROUP 8W, WIRE
DIAGRAMS.
LH HORN SYSTEMS 8G - 3
DIAGNOSIS AND TESTING (Continued)
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