Corvette V8-6.2L (2008)
Circuit/System Description
Battery positive voltage is applied at all times to the horn relay coil and horn relay switch. Pressing the horn switch applies ground to the horn relay
control circuit. The body control module (BCM) also may apply 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 via the horn control circuit. The horn will sound as long as ground is
applied to the horn relay control circuit.
Diagnostic Aids
If diagnosing a Horn - Poor Tone condition, inspect the following:
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Debris or water in the horn assembly.
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Proper horn mounting hardware torque. Refer to Fastener Tightening Specifications (See: Specifications) .
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Debris in the joint where the horns attach to the vehicle.
Reference Information
Schematic Reference
Horn Schematics (See: Diagrams/Electrical Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Horns System Description and Operation (See: Description and Operation)
Electrical Information Reference
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Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics)
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Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics)
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Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics)
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Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
1. Ignition ON, press and release the steering wheel horn pad. The horns should sound and emit a clear and even tone only when the horn pad is
pressed.
‹› If the horns do not sound when the horn pad is pressed or continues sounding after the horn pad is released, refer to Horn Switch Circuit Test.
‹› If the sound emitted from the horns are not clear and even, refer to Horn - Poor Tone.
2. Command the horns ON and OFF with the scan tool. The horns should turn ON and OFF when changing between the commanded states.
‹› If the horns do not turn ON and OFF when changing between the commanded states, refer to Horn Circuit Test.
Circuit/System Testing
Horn Switch Circuit Test
1. Ignition OFF, disconnect the HORN relay.
2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal C1 and ground
‹› If the test lamp illuminates, test the control circuit for a short to voltage.
3. Verify that a test lamp illuminates between the B+ circuit terminal E1 and ground.
‹› If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+
circuit fuse is open, test the control circuit terminal C1 for a short to ground. If the circuit tests normal, test or replace the HORN relay.
4. Verify that a test lamp illuminates between the B+ circuit terminal E2 and ground.
‹› If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
