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Circuit/System Testing

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the KR20C Cooling Fan Low Speed Relay, ignition ON.
  2. Verify that the G10 Cooling Fan Motor is OFF.
    • If the G10 Cooling Fan Motor is OFF 

      Test or replace the KR20C Cooling Fan Low Speed Relay.

    • Go to next step: If the G10 Cooling Fan Motor is ON 
  3. Ignition OFF, disconnect the KR20P Cooling Fan Medium Speed Relay, ignition ON.
  4. Verify the G10 Cooling Fan Motor is OFF.
    • If the G10 Cooling Fan Motor is ON 
    1. Ignition OFF, remove the KR20D Cooling Fan High Speed Relay and disconnect the harness connector at the G10 Cooling Fan Motor, ignition ON.
    2. Test for less than 1 V between the terminals listed below and ground:
      • KR20C Cooling Fan Low Speed Relay terminal 87
      • KR20D Cooling Fan High Speed Relay terminal 87
      • KR20P Cooling Fan Medium Speed Relay terminal 87
      • If 1 V or greater, repair the short to voltage in the relay controlled output circuit.
    • Go to next step: If the G10 Cooling Fan Motor is OFF 
  5. Test or replace the KR20P Cooling Fan Medium Speed Relay.
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