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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 108 (Horns And Pedestrian Alerts) >> Diagnostic Information and Procedures >> Horns Malfunction >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.

P13 Horn Assembly

  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector : P13 Horn Assembly
  3. Connect a jumper wire between the test points : Ground terminal A & Ground
  4. Momentarily connect a 20 A fused jumper wire between the test points : Control terminal B & 12 V

    Verify the component turns On and Off when connecting and disconnecting the jumper wire : P13 Horn Assembly

    • If the component does not turn On and Off 

      Replace the component : P13 Horn Assembly

    • Go to next step : If the component turns On and Off 
  5. All OK.

S33 Horn Switch

  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector : S33 Horn Switch
  3. Test for infinite resistance between the test points : Signal terminal A & Ground terminal B - Switch - Not Pressed
    • If less than infinite resistance 

      Replace the component : S33 Horn Switch

    • Go to next step : If infinite resistance 
  4. Test for less than 3 ohms between the test points : Signal terminal A & Ground terminal B - Switch - Pressed
    • If 3 ohms or greater 

      Replace the component : S33 Horn Switch

    • Go to next step : If less than 3 ohms 
  5. All OK.
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