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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 Ω between the ground circuit terminal 1 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • If less than 10 Ω 
  3. Connect a test lamp between the control circuit terminal 2 and the ground circuit terminal 1, Engine Running.
  4. Verify the test lamp turns ON and OFF when 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 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, 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 1 V between the control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, 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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