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Home >> Cadillac >> 2017 >> CT6 Plug-In >> Repair and Diagnosis (Single Page) >> Hybrid/Electric Powertrain >> Cooling Systems >> Hybrid/EV System Heating And Cooling >> Diagnostic Information and Procedures >> DTC P0480: Cooling Fan Relay 1 Control Circuit >> Circuit/System Verification
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Circuit/System Verification

  1. Vehicle in Service Mode.
  2. Verify that the cooling fan is operating at a high speed when commanding the Cooling Fan Motor Command to 90% with a scan tool.
    • If not operating at a high speed 

      Refer to Circuit/System Testing.

    • If operating as commanded 
  3. Verify that the cooling fan is operating at a low speed when commanding the Cooling Fan Motor Command to 20% with a scan tool.
    • If not operating at a low speed 

      Refer to Circuit/System Testing.

    • If operating as commanded 
  4. All OK.
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