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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1655 (Engine Cooling System) >> Diagnostic Information and Procedures >> DTC P0480 or P0481 (LAT) >> Circuit/System Testing (LAT)

Circuit/System Testing (LAT)

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. Ignition OFF, disconnect the affected relay.
  2. Verify that a test lamp illuminates between the B+ circuit terminal 85 and ground:
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and its fuse is open, test the control circuit terminal 87 for a short to ground. If the circuit tests normal, replace the relay.
  3. Test for 70-110 ohms between terminal 85 and terminal 86 of the relay.
    • If not within the specified range, replace the relay.
  4. Test for 0.0A with a DMM connected in series with the relay coil between circuit terminal 85 and circuit terminal 86 at the relay connector.
    • If more than the specified value, test the control circuit terminal 86 for a short to ground. If the circuit tests normal, replace the ECM.
  5. Command the relay ON with a scan tool. Verify that the DMM indicates more than 100 mA.
    • If not the specified range, test the control circuit terminal 86 for an open/high resistance. If the circuit tests normal, replace the ECM.
  6. If all circuits and the ECM test normal, replace the affected relay.
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