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Inoperative in Both Speeds

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  1. Ignition OFF, disconnect the harness connector at the G10 Cooling Fan Motor.
  2. Verify that the test lamp illuminates between B+ and ground circuit terminal 2 of the G10 Cooling Fan Motor.
    • If the test lamp does not illuminate 
    1. Ignition OFF, remove the test lamp.
    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 the test lamp illuminates 
  3. Disconnect the KR20D Cooling Fan High Speed Relay, ignition ON:
  4. Verify a test lamp illuminates between the KR20D Cooling Fan High Speed Relay terminal 30 and ground.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF, remove the test lamp.
    2. Test for infinite resistance between the KR20D Cooling Fan High Speed Relay terminal 87 and ground:
      • If less than infinite resistance, repair the short to ground in the circuit.
      • If infinite resistance, test or replace the G10 Cooling Fan Motor, replace the fuse as necessary.
    • If the test lamp illuminates 
  5. Ignition OFF, install the KR20D High Speed Relay, Ignition ON.
  6. Command the cooling fan ON at high speed with a scan tool.
  7. Verify a test lamp illuminates between the G10 Cooling Fan Motor terminals 1 and ground.
    • If the test lamp does not illuminate 
    1. Ignition OFF, remove the test lamp.
    2. Disconnect the KR20D High Speed Relay.
    3. Test for less than 2 Ω between KR20D Cooling Fan High Speed Relay terminal 87 and the G10 Cooling Fan Motor terminal 1.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
    • If the test lamp illuminates at each terminal 
  8. Test or replace the G10 Cooling Fan Motor.
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