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Circuit/System Verification

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. If DTC P0480 or P0481 are set, perform those diagnostics first.
  2. Ignition ON, verify with a scan tool that the ECM is not commanding fan activation.
  3. Verify cooling fan operation using the scan tool commands listed below:
    • Fan relay 1 ON-Both fans run at low speed.
    • Fan relays 2 and 3 ON-The right fan runs at high speed, the left fan is OFF.
    • Fan relays 1, 2 and 3 ON-Both fans run at high speed.
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