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HOMESERVICE MANUALSCHEVROLET2018SONIC LS, 1.8L ENG VIN H, AUTOMATIC TRANSREPAIR AND DIAGNOSISBODY & FRAMEWINDOWSFIXED AND MOVEABLE WINDOW SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESREAR WINDOW DEFOGGER MALFUNCTIONCOMPONENT TESTING
2018 Chevrolet Sonic LS, 1.8L Eng VIN H, Automatic Trans

Component Testing

2018 Chevrolet Sonic LS, 1.8L Eng VIN H, Automatic TransSECTION Component Testing

Relay Test

  1. Ignition/Vehicle - Off
  2. Remove the component: KR5 Rear Defogger Relay
  3. Test for 70 to 110 ohms between the test points: Component terminal 85 & 86
    • If not between 70 and 110 ohms 

      Replace the component: KR5 Rear Defogger Relay

    • Go to next step: If between 70 and 110 ohms 
  4. Test for infinite resistance between the test points:
    • Component terminal 30 & 85
    • Component terminal 30 & 86
    • Component terminal 30 & 87
    • Component terminal 85 & 87
    • If less than infinite resistance 

      Replace the component: KR5 Rear Defogger Relay

    • Go to next step: If infinite resistance 
  5. Connect a 3 A fused jumper wire between the test points: Component terminal 86 & 12 V

    Connect a jumper wire between the test points: Component terminal 85 & Ground

  6. Test for less than 2 ohms between the test points: Component terminal 30 & 87
    • If 2 ohms or greater 

      Replace the component: KR5 Rear Defogger Relay

    • Go to next step: If less than 2 ohms 
  7. All OK.
RENDER: 1.0x

NO RELATED

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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.