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Test D: Blower Motor Malfunction

WARNING: This page is about a different car, the 2002 Pontiac Sunfire and 2002 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Definition: The blower motor operates in at least one, but not all, speed positions.
  1. Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. If diagnostic system check has been performed, go to next step.
  2. Turn ignition on, with engine off. Place mode switch in any position except off. Place blower switch in each speed position. If blower motor operates in each speed position, problem is intermittent. Check wiring harness and connectors for damage or defects and poor connections. If blower motor does not operate in each speed position, go to next step.
  3. Turn ignition off. Disconnect harness connector from blower motor resistor. See Figure. Turn ignition on, with engine off. Using a test light connected to positive battery voltage, probe LOW, MED 1, MED 2 and HIGH blower motor control circuit at blower motor resistor. At the same time, place blower switch in the appropriate speed position for the circuit being tested. If test light illuminates on all blower motor control circuits, go to step  5. If test light does not illuminate on all blower motor control circuits, go to next step.
  4. Check the applicable blower motor control circuit for an open or high resistance. See WIRING DIAGRAMS . If an open or high resistance was found, repair as necessary and go to step  10. If an open or high resistance was not found, go to step  7.
  5. Check each blower motor control circuit for a short to ground. See WIRING DIAGRAMS . If a short to ground was found, repair as necessary and go to step  10. If a short to ground was not found, go to next step.
  6. Check harness connector at blower motor resistor for a poor connection. If a poor connection was found, repair as necessary and go to step  10. If a poor connection was not found, go to step  8.
  7. Check harness connector at HVAC control assembly for a poor connection. If a poor connection was found, repair as necessary and go to step  10. If a poor connection was not found, go to step  9.
  8. Replace blower motor resistor. See Figure. If the replacement is complete, go to step  10.
  9. Replace HVAC control assembly. See HVAC CONTROL ASSEMBLY  under REMOVAL & INSTALLATION. If the replacement is complete, go to next step.
  10. Operate system to verify repair. If symptom has been corrected, system is okay. If symptom has not been corrected, go to step  2.
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