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Home >> Chevrolet >> 2017 >> Spark LT, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 96 (Horn System) >> Diagnostic Information and Procedures >> Horns Malfunction >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.

P12 Horn

  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector :P12 Horn
  3. Connect a jumper wire between the test points: Ground terminal 1 & Ground
  4. Momentarily connect a 15 A fused jumper wire between the test points: Control terminal 2 & 12 V

    Verify the component turns On and Off when connecting and disconnecting the jumper wire:P12 Horn

    • If the component does not turn On and Off 

      Replace the component: P12 Horn

    • 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:X1 & X2@S33 Horn Switch
  3. Test for infinite resistance between the test points: Signal terminal 1 X1 & Ground terminal 1 X2 - SwitchNot 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 1 X1 & Ground terminal 1 X2 - 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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