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HOMESERVICE MANUALSCHEVROLET2014CAMARO ZL1, 2D CONVERTIBLE, STANDARD TRANSREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTHEATED GLASS/DEFOGGERSFIXED AND MOVEABLE WINDOW SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC B0283: ELECTRIC REAR DEFROST CIRCUIT SHORT TO GROUNDCIRCUIT/SYSTEM TESTING
2014 Chevrolet Camaro ZL1, 2D Convertible, Standard Trans

Circuit/System Testing

2014 Chevrolet Camaro ZL1, 2D Convertible, Standard TransSECTION Circuit/System Testing
  1. Ignition OFF and all vehicle systems OFF, disconnect the KR5 rear defogger relay. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 ohms between the ground circuit terminal 86 and ground.
    • If 10 ohms or greater 
    1. Ignition OFF.
    2. Test for less than 2 ohms in the ground circuit end to end.
      • If 2 ohms or greater, repair the open/high resistance in the circuit.
      • If less than 2 ohms, repair the open/high resistance in the ground connection.
    • If less than 10 ohms 
  3. Connect a test lamp between the control circuit terminal 85 and the ground circuit terminal 86, Engine Running.
  4. Verify the test lamp turns ON and OFF commanding the rear window defogger ON and OFF with a scan tool.
    • If the test lamp is always OFF 
    1. Ignition OFF, disconnect the harness connector at the K33 HVAC control module.
    2. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 ohms in the control circuit end to end.
      • If 2 ohms or greater, repair the open/high resistance in the circuit.
      • If less than 2 ohms, replace the K33 HVAC control module.
    • If the test lamp is always ON 
    1. Ignition OFF, disconnect the harness connector at the K33 HVAC control module, Engine Running.
    2. Test for less than 1V between the control circuit and ground.
      • If 1V or greater, repair the short to voltage on the circuit.
      • If less than 1V, replace the K33 HVAC control module.
    • If the test lamp turns ON and OFF 
  5. Test or replace the KR5 rear defogger relay.
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