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HOMESERVICE MANUALSCHEVROLET2014CAMARO ZL1, 2D CONVERTIBLE, STANDARD TRANSREPAIR AND DIAGNOSISBODY & FRAMEWINDOWSFIXED AND MOVEABLE WINDOW SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESREAR WINDOW DEFOGGER MALFUNCTIONCIRCUIT/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 when commanding the Rear 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, ignition ON.
    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. Verify that a test lamp does not illuminate between the control circuit terminal 87 and ground.
    • If the test lamp illuminates 

      Repair the short to voltage on the control circuit

    • If the test lamp does not illuminate 
  6. Ignition OFF and all vehicle systems OFF, disconnect the X2 harness connector at the E18 Rear Defogger Grid. It may take up to 2 minutes for all vehicle systems to power down.
  7. Test for less than 10 ohms between the ground circuit terminal A 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 
  8. Connect the X2 harness connector at the E18 Rear Defogger Grid.
  9. Ignition ON, connect a 40A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87.
  10. Verify the E18 Rear Defogger Grid is activated.
    • If the E18 Rear Defogger Grid does not activate 
    1. Ignition OFF, disconnect the X1 harness connector at the E18 Rear Defogger Grid.
    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, test or replace the E18 Rear Defogger Grid.
    • If the E18 Rear Defogger Grid activates 
  11. Test or replace the KR5 Rear Defogger Relay.
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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.