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Circuit/System Testing

  1. Vehicle OFF, disconnect the KR5 rear defogger relay.
  2. Disconnect the KR4B outside rear view mirror heater relay.
  3. Connect a test lamp between the control circuit terminal 85 and the ground circuit terminal 86 at the KR4B outside rear view mirror heater relay, Vehicle ON.
  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. Vehicle 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. Vehicle OFF, disconnect the harness connector at the K33 HVAC control module, Vehicle ON.
    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 or the KR4B outside rear view mirror heater relay.
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