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Horn System: Other Chevrolet Silverado 2500 HD

Horns 5 illustrations ~334 words

Reference Information

Schematic Reference

Horn Schematics

Connector End View Reference

Horn Connector End Views

Electrical Information Reference

  1. «Circuit Testing»(ref-278019-S01379251932008012100000)
  2. «Connector Repairs»(ref-278019-S06982211772008012100000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-278019-S21810776732008012100000)
  4. «Wiring Repairs»(ref-278019-S25320832652008012100000)

Scan Tool Reference

  1. «Scan Tool Output Controls»(ref-278023-S01533577582008012100000)
  2. «Scan Tool Data List»(ref-278023-S26818840182008012100000)
  3. «Scan Tool Data Definitions»(ref-278023-S13868579702008012100000)

Circuit/System Verification

Ignition ON, use scan tool Horn output control to command the horn relay On. The Horn Relay Command output data parameter should display On and the horn should sound.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Underhood Electrical Center or Junction Block Replacement»(ref-278007-S27290193332008012100000)
  2. «Control Module References»(ref-278020-S09054666032008012100000) for BCM replacement, setup, and programming

Symptoms - Horns

IMPORTANTThe following steps must be completed before using the symptom tables
  1. Perform «Diagnostic System Check - Vehicle»(ref-278018-S19353494792008012100000) before using the symptom tables in order to verify that all of the following are true: There are no DTCs set. The control modules can communicate via the serial data link.
  2. Review the system operation in order to familiarize yourself with the system functions. Refer to «Horns System Description and Operation»(ref-278023-S18697276912008012100000) .

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections .

Schematic Reference

Horn Schematics

Connector End View Reference

Horn Connector End Views

Description and Operation

Horns System Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-278019-S01379251932008012100000)
  2. «Connector Repairs»(ref-278019-S06982211772008012100000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-278019-S21810776732008012100000)
  4. «Wiring Repairs»(ref-278019-S25320832652008012100000)

Scan Tool Reference

  1. «Scan Tool Data List»(ref-278023-S26818840182008012100000)
  2. «Scan Tool Data Definitions»(ref-278023-S13868579702008012100000)
  3. «Scan Tool Output Controls»(ref-278023-S01533577582008012100000)

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Horn Switch Replacement»(ref-278023-S01440626082008012100000)
  2. «Horn Replacement - Left Side (GMC)»(ref-278023-S11787573472008012100000) or «Horn Replacement - Left Side (Chevrolet)»(ref-278023-S20757624922008012100000)
  3. «Horn Replacement - Right Side (GMC)»(ref-278023-S32889634882008012100000) or «Horn Replacement - Right Side (Chevrolet)»(ref-278023-S27062450002008012100000)
  4. «Underhood Electrical Center or Junction Block Replacement»(ref-278007-S27290193332008012100000)
  5. «Control Module References»(ref-278020-S09054666032008012100000) for BCM replacement, setup and programming

Scheme 5

Scheme 5: Horn Replacement - Left Side (GMC)
Scheme 5: Horn Replacement - Left Side (GMC)
CalloutComponent Name
Preliminary Procedure: Remove the front bumper fascia trim cap. Refer to Front Bumper Fascia Trim Cap Replacement (GMC) .
1Left Side Horn Bolt NOTE: Refer to Fastener Notice . Tighten: 9 N.m (80 lb in)
2Left Side Horn Tip: Disconnect the electrical connector.
NOTE
Refer to Fastener Notice .

Horn Replacement - Left Side (GMC)

Scheme 6

Scheme 6: Horn Replacement - Left Side (Chevrolet)
Scheme 6: Horn Replacement - Left Side (Chevrolet)
CalloutComponent Name
Preliminary Procedure: Remove the headlamp. Refer to Headlamp Replacement (Chevrolet) or Headlamp Replacement (GMC HD) .
1Left Side Horn Bolt NOTE: Refer to Fastener Notice . Tighten: 9 N.m (80 lb in)
2Left Side Horn Tip: Disconnect the electrical connector.
NOTE
Refer to Fastener Notice .

Horn Replacement - Left Side (Chevrolet)

Scheme 7

Scheme 7: Horn Replacement - Right Side (GMC)
Scheme 7: Horn Replacement - Right Side (GMC)
CalloutComponent Name
Preliminary Procedure: Remove the front bumper fascia trim cap. Refer to Front Bumper Fascia Trim Cap Replacement (GMC) .
1Right Side Horn Bolt NOTE: Refer to Fastener Notice . Tighten: 9 N.m (80 lb in)
2Right Side Horn Tip: Disconnect the electrical connector.
NOTE
Refer to Fastener Notice .

Horn Replacement - Right Side (GMC)

Scheme 8

Scheme 8: Horn Replacement - Right Side (Chevrolet)
Scheme 8: Horn Replacement - Right Side (Chevrolet)
CalloutComponent Name
Preliminary Procedure: Remove the headlamp. Refer to Headlamp Replacement (Chevrolet) or Headlamp Replacement (GMC HD) .
1Right Side Horn Bolt NOTE: Refer to Fastener Notice . Tighten: 9 N.m (80 lb in)
2Right Side Horn Tip: Disconnect the electrical connector.
NOTE
Refer to Fastener Notice .

Horn Replacement - Right Side (Chevrolet)

Scheme 9

Scheme 9: Horn Switch Replacement
Scheme 9: Horn Switch Replacement
CalloutComponent Name
CAUTION: Refer to SIR Caution . Preliminary Procedure: Remove the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement .
1Horn Switch Bolt (Qty: 4) NOTE: Refer to Fastener Notice . Tighten: 8 N.m (71 lb in)
2Horn Switch Procedure: Disconnect any electrical connectors as needed.
CAUTION
Refer to SIR Caution .
NOTE
Refer to Fastener Notice .

Horn Switch Replacement

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