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Home >> Chevrolet >> 2017 >> Spark LT, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 66 (Fixed And MOVEABLE Window System) >> Diagnostic Information and Procedures >> Rear Window Defogger 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.

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.
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