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40-0
HORNS
HOT AT ALL TIMES
HORN
Fuse 21
15A
FUSE
BLOCK –
UNDERHOOD
Connector
C4
F4
F NOTE
HORN
HORN
ASSEMBLY
A
B
HORN
RELAY
40
C2
E2
BLK
0.35
DK GRN
0.5
BLK
0.5
G103
A NOTE
HORN
TURN SIGNAL/
MULTIFUNCTION
SWITCH
Connector
C2
E12
BODY
CONTROL
MODULE
(BCM)
Connector
Horn
relay
control
BLK
0.35
D4
BLK
1
BLK
1
See Ground
Distribution,
page 14.
C201
Connector
C1
G
BLK/YEL
0.35
A
C108
Connector
BLK
0.5
Horn
switch
Circuit Schematic
40-1
HORNS
120Ć3
Voltage is applied at all times through the HORN fuse to
the horn relay in the underhood fuse block. The circuit
continues from the horn relay to the horn switch. When
the horn switch is closed, the circuit path is completed
to ground and the horn relay energizes. The BCM may
also apply ground to the horn relay control circuit when
the content theft deterrent system detects a vehicle
intrusion, when the panic button is depressed on the
remote control door lock transmitter, when the lock
button on the keyless entry transmitter is pressed twice
within 5 seconds, a horn chirp will sound to notify the
driver that the vehicle has been locked, or when the
OnStar
r
system is used to sound the horns (if
equipped). The relay contact closes and battery
voltage is applied to the horn. The horn sounds.
Circuit Operation
40-2
HORNS
(Refer to Section 201 for photographs.)
Component
Photo No.
Body Control Module
(BCM)
On Rear Fuse Block, under left rear seat
53
. . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuse Block-Underhood
Left side of engine compartment
3
. . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Horn Assembly
Left Front Engine Compartment
2
. . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Horn Relay 40
In the Underhood Fuse Block
49
. . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Turn Signal/Multifunction
Switch
On the stalk, on the left side of the steering column
71
. . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . .
Connector
C108 (5.3L) (8-LT GRY)
Top right side of engine
20
. . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C201 (17-BLK), (18-BLK),
and (13-GRY)”
At base of steering column
120
. . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ground
G103
Right rear of engine compartment
15
. . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Component Location Index
44
ANTI-LOCK BRAKE SYSTEM (ABS)
Brake Fluid Level Switch
Electronic Brake Control Module (EBCM)
Front Axle Actuator
Fuse Block-Rear
Fuse Block-Underhood
Instrument Panel Cluster (IPC)
Powertrain Control Module (PCM) (4.2L)
Powertrain Control Module (PCM) (5.3L)
SP201
Stop Lamp Switch
Traction Control Switch (2WD)
Wheel Speed Sensor (WSS)-LF
Wheel Speed Sensor (WSS)-RF
Component Index
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