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HOMESERVICE MANUALSCHEVROLET2019TAHOE LS, 4WD, GAS/ETHANOLREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 117 (HORN SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESHORNS MALFUNCTIONCOMPONENT TESTING
2019 Chevrolet Tahoe LS, 4WD, Gas/Ethanol

Component Testing

2019 Chevrolet Tahoe LS, 4WD, Gas/EthanolSECTION Component Testing
WARNING: This page is about a different car, the 2018 Chevrolet Sonic. However, it is still accessible from the selected car via links, so may be relevant.

P12B Horn - Low Note

  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: P12B Horn - Low Note
  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:P12B Horn - Low Note

    • If the component does not turn On and Off 

      Replace the component: P12B Horn - Low Note

    • 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 - 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 1 X1 & Ground terminal 1 X2 - Switch - Pressed
    • If 3 ohms or greater 

      Replace the component: Horn Switch

    • Go to next step: If less than 3 ohms 
  5. All OK.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.