Horn System: Other Chevrolet Silverado 3500 HD

Reference Information

Schematic Reference

Horn Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Horns System Description and Operation

Electrical Information Reference

1. «Circuit Testing»(ref-317172-S12100958872009060900000)
2. «Connector Repairs»(ref-317172-S41839496312009060900000)
3. «Testing for Intermittent Conditions and Poor Connections»(ref-317172-S08096213032009060900000)
4. «Wiring Repairs»(ref-317172-S40815672902009060900000)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Command the horn ON and OFF with the scan tool. The horn should turn ON and OFF when changing between the commanded states.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Underhood Electrical Center or Junction Block Bracket Replacement»(ref-317157-S32554709492009060900000)
2. «Control Module References»(ref-317173-S10180079792009060900000) for BCM replacement, setup and programming

Symptoms - Horns

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

Component Connector End Views

Description and Operation

Horns System Description and Operation

Electrical Information Reference

1. «Circuit Testing»(ref-317172-S12100958872009060900000)
2. «Connector Repairs»(ref-317172-S41839496312009060900000)
3. «Testing for Intermittent Conditions and Poor Connections»(ref-317172-S08096213032009060900000)
4. «Wiring Repairs»(ref-317172-S40815672902009060900000)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition OFF, connect a test lamp between the HORN fuse test point and ground.
2. Press and release the horn switch. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp does not illuminate or remains illuminated at all times, refer to «Horn Switch Circuit Test»(ref-317163-S37213552302009071700000) .
3. Ignition ON, command the horn ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp does not illuminate, test the control circuit terminal 18 at the BCM for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
4. Connect a 10A fused jumper wire between the HORN fused test point and B+. The horns should sound and emit a clear and even tone. If the horn does not sound, refer to «Horn Circuit Test»(ref-317163-S17063626152009071700000) .

1. If the sound emitted is not clear and even, refer to «Horn - Poor Tone»(ref-317163-S15040843822009071700000) .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Underhood Electrical Center or Junction Block Bracket Replacement»(ref-317157-S32554709492009060900000)
2. «Horn Replacement - Left Side (Chevrolet)»(ref-317163-S24931977722009060900000) or «Horn Replacement - Left Side (GMC)»(ref-317163-S08683458742009060900000)
3. «Horn Replacement - Right Side (Chevrolet)»(ref-317163-S38316326382009060900000) or «Horn Replacement - Right Side (GMC)»(ref-317163-S01355902662009060900000)
4. «Steering Wheel Horn Switch Replacement»(ref-317163-S25714165332009060900000)
5. «Control Module References»(ref-317173-S10180079792009060900000) for BCM replacement, setup, and programming

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