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Chevrolet Silverado / GMC Sierra. Manual - part 2296
Fig. 5: Horn - Right Side (Chevrolet)
Courtesy of GENERAL MOTORS CORP.
STEERING WHEEL HORN SWITCH REPLACEMENT
Callout
Component Name
Preliminary Procedure:
Remove the headlamp. Refer to Headlamp Replacement (GMC HD) or Headlamp
Replacement (Chevrolet) .
1
Right Side Horn Bolt
Tighten: 9 N.m (80 lb in)
NOTE:
Refer to Fastener Notice .
2
Right Side Horn
Tip: Disconnect the electrical connector.
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Horns - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 6: Steering Wheel Horn Switch
Courtesy of GENERAL MOTORS CORP.
Callout
Component Name
Preliminary Procedure: Remove the inflatable restraint steering wheel module. Refer to
Inflatable Restraint Steering Wheel Module Replacement .
CAUTION:
Refer to SIR Caution .
1
Horn Switch Bolt (Qty: 4)
NOTE:
Refer to Fastener Notice .
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Horns - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
DESCRIPTION AND OPERATION
HORNS SYSTEM DESCRIPTION AND OPERATION
System Description
The horn system consists of the following components:
HORN fuse
Horn PCB relay
Horn switch
Horn
Body control module (BCM)
System Operation
The vehicle horns are activated whenever the horn switch is depressed.
The BCM commands the horns ON under any of the following conditions:
When the panic button is depressed on the remote control door lock transmitter. For
further information refer to Keyless Entry System Description and Operation .
When the keyless entry system is used to lock the vehicle, a horn chirp may sound to
notify the driver that the vehicle has been locked. The notification feature may be
enabled or disabled through personalization. For further information refer to Keyless
Entry System Description and Operation .
When the OnStar® system is used to sound the horns if equipped. For further
information, refer to OnStar Description and Operation .
Circuit Operation
Battery positive voltage is applied at all times to the horn relay coil and the horn relay switch.
Pressing the horn switch applies ground to the horn relay control circuit. When the horn relay
control circuit is grounded, the horn relay is energized and battery positive voltage is applied to
the horn through the horn control circuit. The horn will sound as long as ground is applied to the
horn relay control circuit.
Tighten: 8 N.m (71 lb in)
2
Horn Switch
Procedure:
Disconnect any electrical connectors as needed.
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Horns - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
2008 HVAC
Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
SPECIFICATIONS
FASTENER TIGHTENING SPECIFICATIONS
Application
Specification
Metric
English
A/C High Pressure Recirculation Switch
6 N.m
53 lb in
A/C Low Pressure Switch
6 N.m
53 lb in
A/C Refrigerant Filter Retaining Nuts
15 N.m
11 lb ft
Accumulator Bracket Nut
9 N.m
80 lb in
Accumulator Clamp Bolt
10 N.m
8 lb ft
Air Distribution Duct Screws
1.6 N.m
14 lb in
Air Outlet Mounting Screw
1.6 N.m
14 lb in
Auxiliary A/C Tubes at the Auxiliary HVAC
Module
16 N.m
12 lb ft
Auxiliary Evaporator Tube to TXV Nut
28 N.m
21 lb ft
Auxiliary HVAC Module A/C Line Nut
16 N.m
12 lb ft
Auxiliary HVAC Module Mounting Nuts to Vehicle
9 N.m
80 lb in
Blower Motor Insulating Cover Screw
1.6 N.m
14 lb in
Blower Motor Relay/Resistor Screw
1.6 N.m
14 lb in
Compressor Bracket Mounting Bolts
50 N.m
37 lb ft
Compressor Clutch Coil Connector Retaining
Bracket Screw
9 N.m
80 lb in
Compressor Clutch Plate Retaining Bolt
18 N.m
13 lb ft
Compressor Discharge Hose Nut at Compressor
16 N.m
12 lb ft
Compressor Hose Bolt to Compressor (L18
Harrison)
34 N.m
25 lb ft
Compressor Mounting Bolts (L18 Harrison)
50 N.m
37 lb ft
Compressor Mounting Bolts (LR4, LM7, LQ4
Denso)
50 N.m
37 lb ft
Compressor Suction/Discharge Hose Bolt
34 N.m
25 lb ft
Compressor Suction Hose Nut to Accumulator
16 N.m
12 lb ft
2008 Chevrolet Silverado 1500
2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
2008 Chevrolet Silverado 1500
2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
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