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Circuit/System Testing

WARNING: This page is about a different car, the 2007 Suzuki XL7. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the blower motor control processor.
  2. Test for less than 1.0 Ω of resistance between the ground circuit terminal and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the B+ circuit of the blower motor speed control processor supply voltage terminal 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 the B+ circuit fuse (HVAC/RFA 10-amp) fuse in the instrument panel (IP) BEC is open, test all components connected to the B+ circuit and replace as necessary.
  4. Connect a test lamp between the blower motor speed control circuit and the blower motor supply voltage circuit of the blower motor control processor.
  5. Turn the blower motor ON high speed and then OFF. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the HVAC control module.
    • If the test lamp is always OFF, test the speed control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the HVAC control module.
  6. Ignition OFF, connect the harness connector at the blower motor control processor.
  7. Disconnect the harness connector at the blower motor.
  8. Ignition ON, verify that a test lamp illuminates between the blower motor supply voltage circuit of the blower motor control processor and ground.
    • If the test lamp does not illuminate, test the blower motor supply voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the blower motor control processor.
  9. Connect a test lamp between the blower motor supply voltage circuit and the blower motor ground circuit of the blower motor control processor.
  10. Turn the blower motor ON high speed then to low speed. The test lamp intensity should be bright when ON high speed and very dim or out when the blower is on low speed.
    • If the test lamp intensity is not correct, test the blower motor ground circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the blower motor control processor
  11. If all circuits test normal, replace the blower motor.
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