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Home >> Chevrolet >> 2018 >> Corvette Z51, 2D Convertible, Standard Trans >> Repair and Diagnosis >> Body & Frame >> Windows >> Fixed And MOVEABLE Window System >> Diagnostic Information And Procedures >> Rear Window Defogger Malfunction >> Component Testing

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.