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Circuit/System Testing (with HP5)

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 harness connector at the heater core coolant pump.
  2. Verify that a test lamp illuminates between the B+ circuit terminal A and ground.
    • If the test lamp does not light, test the B+ circuit for a short to ground, open or high resistance. If the circuit tests normal, replace the Coolant heater pump
  3. Ignition ON, verify that a test lamp illuminates between the control circuit terminal B and the voltage circuit terminal A while commanding the pump ON and OFF with a scan tool.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the starter generator control module.
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